CN109852860A - High-toughness heat-resistant Mg-Y alloy and preparation method thereof suitable for low pressure casting - Google Patents
High-toughness heat-resistant Mg-Y alloy and preparation method thereof suitable for low pressure casting Download PDFInfo
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Abstract
The present invention provides the high-toughness heat-resistant Mg-Y alloys and preparation method thereof for being suitable for low pressure casting, the alloying component and stoichiometric ratio are as follows: 2.5~5.0%Y, 1.0~4.0%Zn, 0.5~1.2%Al, 0.1~0.3%Mn, 0.01~0.08%M, surplus Mg；Wherein M is Ti, one or two kinds of elements in B.Preparation method: 1) by Mg-Y alloying component ingredient is carried out；2) technical pure magnesium ingot is melted；3) 700 DEG C are warming up to, industrial-purity zinc, Mg-Y and Mg-Mn intermediate alloy are added, stirring to whole fusings；4) 730 DEG C are warming up to, the technical pure aluminium ingot, Al-Ti, Al-Ti-B, Al-B intermediate alloy wait sequentially add all after fusing, obtain magnesium alloy fused mass after refining；5) low pressure casting；6) second level solution treatment, artificial aging processing.For alloy of the invention after the heat treatment of low pressure casting, second level solution treatment and artificial aging, room temperature tensile intensity reaches 305MPa, elongation percentage 19%；Drawing by high temperature tensile strength reaches 210MPa at 200 DEG C, and elongation percentage 26% meets the industries such as aerospace to light-weighted high demand.
Description
Technical field
The present invention relates to the high-toughness heat-resistant Mg-Y alloys for being suitable for low pressure casting, meet the row such as aerospace, automobile, telecommunication
The high demand that industry develops lightweight.The invention further relates to the preparation sides for the high-toughness heat-resistant Mg-Y alloy for being suitable for low pressure casting
Method belongs to industrial magnesium alloy and its manufacturing field.
Background technique
For magnesium alloy as most light engineering metal material (density of magnesium is 2/3, the 1/4 of steel of aluminium), specific strength is obvious
Higher than aluminium alloy and steel, although specific stiffness is suitable with aluminium alloy and steel, it is much higher than engineering plastics, while there is good casting
Property, the series of advantages such as machinability is good, thermal conductivity is good, damping and amortization and electromagnetic shielding capability are strong and are easily recycled, navigating
The fields such as sky, space flight, automobile, electronics and defence and military have a wide range of applications.Magnesium alloy becomes substitution aluminium alloy, steel
With engineering plastics to realize light-weighted ideal material, wherein it is aluminium alloy that it is maximum, which to substitute potentiality,.Cast aluminium alloy gold has must
The toughness and tenacity and thermal stability wanted are widely used for production engine cylinder body and the parts such as cylinder cap and wheel hub at present, represent
Alloy be A354, A356 and A380.If magnesium alloy replaces cast aluminium alloy gold, it must have equivalent toughness and tenacity, and
It is inexpensive, be easy to cast.Low pressure casting is that dry compressed air or inert gas are passed through in the crucible of sealing, by means of effect
In the pressure on metal bath surface, liquid alloy is passed through into running channel along stalk from bottom to top and is smoothly pressed into metal mold or sand mold etc.
Casting mold type chamber, and solidification obtains the casting method of casting under pressure.With the alloy die cast technique etc. generallyd use at present
It compares, low pressure casting is the optimization technique of the large-scale complex-shaped high-quality high-performance casting of production.
Earliest, the Atomic radiuses difference of main alloy element aluminium and magnesium is larger while in magnesium for the application of Mg-Al class magnesium alloy
In have biggish solid solubility, play solution strengthening and precipitation strength in the alloy.Find that a small amount of Mn is significant in nineteen twenty-five
After the corrosion resistance for improving Mg-Al-Zn system magnesium alloy, AZ (such as AZ91) and AM system magnesium alloy (such as AM60, AM50) develop into mesh
Preceding most widely used commercialization magnesium alloy.However the high temperature creep property of AZ and AM magnesium alloy is very poor, it is lower than Aluminium Alloys in Common Use
An order of magnitude is more, and the tensile strength when temperature is higher than 150 DEG C reduces rapidly, and reason is during high-temerature creep
Mg of the oversaturated α-Mg matrix in grain boundaries17Al12Mutually discontinuous precipitation.By the way that alloying element is added to improve precipitated phase
The heat resistance of characteristic (crystal structure, form and thermal stability) Lai Tigao Mg-Al alloy, but its room temperature and mechanical behavior under high temperature
It is still unable to reach the level of cast aluminium alloy gold, seriously limits its application development.For example, application publication number is CN109136701A
Patent document (a kind of sand mold gravitational casting magnesium alloy materials and preparation method thereof) disclosed in magnesium alloy component content are as follows: 3.5
~4.5wt.%Al, the mischmetal of one or more of La, Ce, Pr of 0.5~4.5wt.%, 0.2~0.5wt.%Mn,
One or more of Gd, Y, Sm, Nd, Er, Eu, Ho, Tm, Lu, Dy, Yb of 0.01~2.5wt.% mischmetal, remaining is
Mg；The best ambient temperature mechanical properties for the alloy reported: tensile strength 231MPa, elongation percentage 11.4%.
Maximum solid solution degree of the zinc Zn in Mg is up to 6.2wt%, can play the role of solution strengthening and ageing strengthening, is high-strength
Spend the important intensified element of magnesium alloy.Typical Mg-Zn series cast magnesium alloy includes ZK51A and ZK60A, and deforming alloy includes
ZK21A, ZK31, ZK40A, ZK60A and ZK61 etc..Increase with Zn content, the tensile strength and yield strength of alloy improve, and have no progeny
Elongation is declined slightly, but casting character, process plastic and welding performance deteriorate, especially because freezing range it is wide (such as
The freezing range of ZK60 is up to 265 DEG C, Journal of Materials Science, 45 (14) (2010) 3797-3803),
Cause its hot cracking tendency extremely serious.Rare earth elements RE (rare earth element) is to the beneficial work of magnesium alloy strength performance
With and zirconium to the Grain Refinement Effect of magnesium alloy found in nineteen thirties, Mg-RE-Zr system (EK30,
EK31, EK41) in EK31 become the high temperature cast magnesium alloy succeeded in developing earliest in Mg-Zr class.Magnesium based on rare earth RE element
Rare earth alloy has excellent aging hardening effect, a variety of to be successively developed with the novel magnesium alloy that RE is main added elements,
WE54, WE43 alloy of such as Mg-Y system.Application publication number be CN1676646A patent document (high-strength heat-resisting magnesium alloy and
Preparation method) a kind of preparation method of high-strength heat-resisting magnesium alloy is disclosed, the Mg-Gd-Y-Zr (- Ca) rare earth magnesium invented
The component and its weight percent of alloy are as follows: 6~15%Gd, 1~6%Y, 0.35~0.8%Zr, 0~1.5%Ca, impurity member
The total amount of plain Si, Fe, Cu and Ni are less than 0.02%, surplus Mg.However, when carrying out sand casting using such alloy, crystal grain
Size reaches 90 μm, cast T6 state alloy tensile strength, yield strength and elongation percentage be only respectively 295MPa, 212MPa and
A kind of 2.2% (high-strength temperature-resistant magnesium conjunction suitable for sand casting disclosed in patent document of the application publication number for CN104928548A
Gold and preparation method thereof)；Although the addition of Ca improves the yield strength and elevated temperature strength of alloy simultaneously, conjunction also increased dramatically
The solidification temperature range of gold increases hot cracking tendency, reduces the processing performance of alloy.
Yttrium Y is that content is larger and widely used rare earth element in the earth's crust, price be only below cerium Ce and lanthanum La both
Rare earth element.As the heavy rare earth element (4.4689g/cm minimum except scandium outer density3), Y solid solubility in magnesium reaches
12.5wt%, Y strengthen magnesium-alloy solid decompose when generate be difficult to offer an explanation the area GP, by certain incubation time will form with
The intermediate alloy of matrix coherence mutually precipitates, and generates good heat treatment reinforcement effect.Cheap Zn is added in Mg-Y alloy, no
More obvious action only is woven with to the Precipitation group for regulating and controlling the alloy system, and can be with shape under the conditions of different Zn/Y ratios
At a variety of hardening constituents: the icosahedral quasicrystal body knot easy to form when mass ratio >=4.13 Zn/Y (atomic ratio >=6.0) in alloy
Structure I phase (Mg3Zn6Y)；As Zn/Y mass ratio (atomic ratio is between 1.5 and 6.0) Shi Rongyi between 1.10 and 4.13 in alloy
Form face-centred cubic structure W phase (Mg3Zn3Y2) and I phase；When Zn/Y mass ratio (atomic ratio between 0.69 and 1.10 in alloy
Between 1.0 and 1.5) when W phase and long period stacking order structure LPSO phase (Mg easy to form12ZnY)；When Zn/Y mass in alloy
LPSO phase (Materials Letter, 59 (29) (2005) 3801-3805 easy to form when than≤0.69 (atomic ratio≤1.0)；
Acta Materialia,58(8)(2010)2936-2947).A variety of Mg-Y-Zn hardening constituents can be further improved magnesium alloy
Room temperature intensity and high-temperature behavior, in addition to hardening constituent W, the elasticity modulus and microhardness of LPSO phase are more much higher than pure magnesium,
The intensity and plasticity that magnesium alloy can be significantly improved, make alloy show excellent comprehensive mechanical property.The study found that in Mg-
Only when rare earth element is that Y, Gd, Er, Dy, Ho, Tb, Tm can form LPSO structure (Materials in RE-Zn system
Transactions, 48 (11) (2007) 2986-2992).Application publication number is a kind of patent document (standard of CN101713042A
Crystalline substance enhancing magnesium alloy and its method for preparing semisolid) disclosed in quasicrystal reinforced magnesium alloy alloy compositions and mass percent
Are as follows: 4~15%Zn, 0.5~3.5%Y, 3~10%Al, remaining is Mg；Preparation method is using hot-extrusion method by Mg-
Zn-Y-Al alloy cast ingot is squeezed into bar, and extruded bars are then heated to semisolid using electromagnetic induction heater, carries out
Semisolid pressure casting molding.Application publication number be CN102212727A patent document (Authigenic quasicrystal-reinforced Mg-Zn-Y alloy and its
Method of smelting) disclosed in Authigenic quasicrystal-reinforced Mg-Zn-Y alloy chemical component quality percentage composition are as follows: 3.0~10.0%Zn,
0.5~3.0%Y, 0.05~1.0%Al-Ti-C, surplus are Mg and inevitable impurity；Preparation method include melting and
Casting, the melt after melting are added Al-Ti-C intermediate alloy when being cooled to 700~720 DEG C, introduce ultrasonic wave in the melt, pass through
Casting is made after ultrasonication；The invention Authigenic quasicrystal-reinforced Mg-Zn-Y alloy tensile strength is up to 260MPa, elongation percentage
10.6%.The inventive technique there are still following problems: the Zn/Y mass of the alloy forms icosahedral quasicrystal phase, simultaneously than too high levels
Its freezing range is excessive, is also easy to produce casting flaw；And introduce ultrasonication, operation is excessively complicated, be difficult industrially into
The large-scale application of row.Under the conditions of conventional coagulation, Mg-Y-Zn alloy grain is coarse, and precipitated phase is usually in coarse netted knot
Structure is degrading its mechanical property, it is necessary to adjust precipitate size by thermal deformation or heat treatment solid solution and timeliness to play it
The effect of hardening constituent.
Mg-Y-Zn alloy is usually added into Zr as grain refining element, to refine its coarse microstructure.It has reported at present
Road adds Zr mode to have the halogen of sponge Zr, Zr, Zn-Zr and Mg-Zr intermediate alloy etc., and wherein Mg-Zr intermediate alloy has use
Conveniently, the advantages that being mingled with less with good in refining effect, is the major way for being currently fed Zr.But Mg-Zr intermediate alloy is added still
There are many problems: firstly, the preparation process of Mg-Zr intermediate alloy is complicated, energy consumption is high, leading to that it is expensive, therefore uses
Mg-Zr intermediate alloy refinement crystal grain can improve product cost；Secondly, Zr chemical activity is strong, it is easy and atmosphere, furnace gas at high temperature
Reaction, when using steel crucibles, when melt temperature is higher than 750 DEG C, the easy Fe reaction in crucible of Zr is generated stable
Intermetallic compound Fe2Zr, it is high that these result in Zr loss；Many Zr in Mg-Zr intermediate alloy are with large scale simple substance
The form of grain exists, and since the fusing point of Zr is high (1852 DEG C), Zr particle is difficult to dissolve in melt, in addition the density of Zr is much larger than
(density of Zr is 6.52g/cm to the density of Serum Magnesium3, the density of pure Serum Magnesium is 1.58g/cm3), it is easy to be deposited to crucible bottom
Portion causes the recovery rate of Zr low.
Summary of the invention
The present invention is unable to reach the casting aluminium such as A380 to solve existing cast magnesium alloy because of obdurability, heat resistance deficiency
The performance of alloy, the professional problem for causing its application to be extremely restricted, provides the high-toughness heat-resistant Mg- suitable for low pressure casting
Y alloy and preparation method thereof, for the alloy after low pressure casting is heat-treated, the room temperature tensile intensity of alloy reaches 305MPa, extends
Rate 19%；Drawing by high temperature tensile strength reaches 210MPa, elongation percentage 26% at 200 DEG C.
In order to solve the above-mentioned technical problem, the present invention adopts the following technical solutions:
High-toughness heat-resistant Mg-Y alloy of the present invention suitable for low pressure casting, the member including following mass percent
Element: 2.5~5.0%Y, 1.0~4.0%Zn, 0.5~1.2%Al, 0.1~0.3%Mn, 0.01~0.08%M, surplus Mg
With other inevitable impurity, wherein one or both of M Ti, B.
The innovative point of the high-toughness heat-resistant Mg-Y alloy suitable for low pressure casting of invention:
(1) in alloy design in addition to common metal Zn, Al, Mn and a small amount of Ti and B element, the present invention selects rare earth member
Cheap Y element (its price is only below Ce and La) is used as its alloy element in element, and the intermediate alloy of Mg-Y is high because Y has
Corrosion resistance and be easy preparation.Alloy element Y and Zn and matrix Mg element form ternary Mg-Y-Zn hardening constituent, in Zn/Y
In the range of mass ratio 0.3~1.0, on the one hand, alloy of the present invention primarily forms long period stacking order structure LPSO phase
(Mg12) and face-centred cubic structure W phase (Mg ZnY3Zn3Y2), it is high-melting-point phase；With binary Mg-Y hardening constituent ratio, ternary Mg-RE-
The high-temperature stable of Zn hardening constituent LPSO and W in magnesium matrix is more preferable, avoids the reduced performance as caused by precipitation strength phased soln,
The room-temperature mechanical property and high-temperature behavior of high-toughness heat-resistant casting Mg-Y alloy are effectively enhanced, especially at 300 DEG C
High temperature creep property improves an order of magnitude or more.On the other hand, the present invention solves traditional Mg-Zn-Y alloy because excessively high
Zn content causes freezing range excessive and is also easy to produce thermal fragmentation defect, so that alloy toughness and tenacity and Production Practice of Casting Technologies be caused to reduce
Technical problem.
(2) Mg-Y-Zn alloy precipitated phase under the conditions of conventional coagulation is usually in coarse reticular structure, is degrading its mechanics
Performance, it is often necessary to which precipitate size is adjusted to play the work of its hardening constituent by thermal deformation or heat treatment solid solution and timeliness
With.Such alloy is usually added into Zr as grain refining element, and Al, Mn and Rare Earth Y alloy are contained in alloying element of the invention
Element, these elements form Al in conjunction with Zr3The compounds such as Zr and being deposited to crucible bottom makes zirconium not play Grain Refinement Effect.Separately
On the one hand, studies have shown that the thermal structure stability of the Mg-Y-Zn alloy of addition Zr refinement is poor, in 550 DEG C of heat preservations, crystal grain is anxious
Play roughening, causes high-temperature behavior to be greatly lowered.To solve the above-mentioned problems, 0.5-1.2%Al is added in alloy of the invention
Zr is substituted, the high-melting-point Al of disperse is formed2Y phase has not only refined the tissue of alloy, but also has ensured magnesium with high-temperature-phases such as LPSO
The high-temperature stability of alloy structure.Al plays composite crystal grain fining together with a small amount of Ti and B simultaneously, has further refined conjunction
Payment organization improves the obdurability of alloy.A small amount of Mn is added in alloying element of the invention, can not only promote LPSO phase
It is formed, improves the high-temperature stability of alloy, and improve the corrosion resistance of magnesium alloy.
(3) in order to reduce the hot cracking tendency in Mg-Y-Zn alloy casting process, Zn/Y mass ratio is limited in alloy of the present invention
0.3~1.0, (Zn+Al)/Y mass ratio is 0.5~1.2.Under this mass ratio, alloy of the invention obtains relatively narrow solidification
Section improves the Production Practice of Casting Technologies of alloy to overcome the hot cracking tendency in Mg-Y-Zn alloy casting process.
The preparation method of the above-mentioned high-toughness heat-resistant Mg-Y alloy suitable for low pressure casting, includes the following steps:
(1) with due regard to after scaling loss, by Mg-Y alloying component and stoichiometric ratio, raw material needed for calculating (technical pure magnesium ingot,
Industrial-purity zinc, technical pure aluminium ingot, Mg-Y intermediate alloy, Mg-Mn intermediate alloy, Al-Ti intermediate alloy, Al-Ti-B intermediate alloy
With Al-B intermediate alloy) dosage；Technical pure magnesium ingot, industrial-purity zinc, technical pure aluminium ingot and Mg-Y and Mg-Mn intermediate alloy is equal
It removes removing oxide layer and dries to be preheated to 200 DEG C.
(2) after the technical pure magnesium ingot for accounting for crucible height 25% being fused into molten bath at 680 DEG C, it is passed through protective gas, is added
Enter remaining magnesium ingot.The protective gas is argon gas, or the SF for being 0.2% containing volume fraction6And CO2Mixed gas (i.e. SF6Body
Fraction is 0.2%, CO2Volume fraction be 99.8%).
(3) after magnesium ingot all fusing, 700 DEG C are warming up to, by industrial-purity zinc and Mg-Y and Mg-Mn intermediate alloy point more (2
~4) secondary addition, and keep temperature constant at 700 DEG C, it is stirred until all melting, and keep the temperature 30min.Preferably, institute
Stating Mg-Y intermediate alloy is MgY25 or MgY30, and the Mg-Mn intermediate alloy is MgMn10.
(4) 40~60min before low pressure casting is warming up to 730 DEG C, closes among technical pure aluminium ingot to be sequentially added, Al-Ti
Gold, Al-Ti-B intermediate alloy, Al-B intermediate alloy all after fusing, are added refining agent and are refined, furnace temperature is risen to 750 DEG C
Heat preservation stands 10~20min, and promotion is mingled with sedimentation, obtains magnesium alloy fused mass.The Al-Ti-B intermediate alloy is AlTi5B1, institute
Stating Al-B intermediate alloy is AlB3 or AlB8, and the Al-Ti intermediate alloy is AlTi5 or AlTi10.The quality of the refining agent
Percent composition are as follows: 55%KCl, 25%CaCl2, 5%CaF2, 15%BaCl2.The refining agent additive amount is raw material gross weight
1.0~3.5%, refining temperature when refining agent refining is added is 720~730 DEG C, the mixing time 10 of refining treatment~
15min。
(5) magnesium alloy fused mass is cooled between 720~740 DEG C and is removed the gred, preheating sand mold type molds temperature is extremely
25~150 DEG C or metal type dies temperature are to 180~250 DEG C.Low pressure casting process, which is controlled and is classified by proportioning valve, to be added
Pressure, low pressure casting process include: a liter liquid, fill type, pressurization, pressure maintaining, release stage, wherein the pressure for rising the liquid stage uniformly increases
To 0.02-0.05MPa, pressing time is controlled in 5~8s；The pressure for filling the type stage is uniformly increased to 0.08MPa, and molten metal is being pressed
Casting mold type chamber is full of under power；The pressure of pressurization stages is uniformly increased to 0.1MPa, and pressing time controls in 10~15s；Pressure maintaining rank
The dwell time of section controls in 200~300s.Prepared As-cast High Strength Toughness heat-resistant cast Mg-Y alloy is taken out after release.
(6) the resulting cast alloy of low pressure casting is successively carried out needed for second level solution treatment, artificial aging processing acquisition
High-toughness heat-resistant Mg-Y alloy.
The step of second level solid solution treatment process suitable for the high-toughness heat-resistant Mg-Y alloy of low pressure casting are as follows: by as cast condition
Alloy is put into solid solution furnace, is warming up to 200 DEG C with 5 DEG C/min, and being passed through protective gas, (protective gas is argon gas, or contains body
The SF that fraction is 0.2%6And CO2Mixed gas (i.e. SF6Volume fraction is 0.2%, CO2Volume fraction be
99.8%)), continue to be warming up to 480~490 DEG C of first order solid solubility temperature with 5 DEG C/min, keep the temperature 36~48h；Then with 10 DEG C/h
It is warming up to 535~545 DEG C of second level solid solution temperature at a slow speed, carries out water on fast transfer to quenching unit after 1~2h of heat preservation
Cold quenching.
The step of artificial aging treatment process suitable for the high-toughness heat-resistant Mg-Y alloy of low pressure casting are as follows: will quench
Alloy afterwards is put into aging furnace, 185~215 DEG C of artificial aging treatment temperature is warming up to 5 DEG C/min, after keeping the temperature 12~36h
It comes out of the stove and is air-cooled to room temperature.
The second level solid solution treatment process parameter are as follows: 480~490 DEG C of first order solid solubility temperature, 36~48h of soaking time；
535~545 DEG C of second level solid solubility temperature, 1~2h of soaking time；
The artificial aging treatment process parameter: 185~215 DEG C of aging temp, 12~36h of soaking time.
The innovative point of the preparation method of high-toughness heat-resistant Mg-Y alloy provided by the invention suitable for low pressure casting: (1) exist
700 DEG C are added the Mg-Y intermediate alloy of easy scaling loss, and fusing is kept the temperature in this low-temperature melt, improve the recovery rate of Rare Earth Y；
(2) refining treatment, which uses, is free of MgCl2Dedicated refining agent, further reduced the scaling loss of Rare Earth Y in refining process；(3) originally
The heat treatment of the invention high-toughness heat-resistant casting Mg-Y alloy includes two processes of solution treatment and ageing treatment.Second level is solid
480~490 DEG C, 36~48h of time of the first order temperature of molten processing, the solubility of Y and Zn in magnesium matrix is sufficiently promoted, is eliminated
The coarse precipitated phase such as LPSO；535~545 DEG C of the first order temperature of second level solution treatment, 1~2h of time, the short time keeps the temperature into one
Step eliminates the coarse phases such as undissolved LPSO, existing regional segregation, microsegregation in casting is eliminated, so that the ingredient of alloy is equal
It homogenizes, to improve the performance of alloy, and prevents heat treatment burn-off phenomenon.Furnace temperature is maintained at 185~215 DEG C, heat preservation
12~36h carries out ageing treatment, and long period timeliness finally makes the transgranular precipitation Nano grade, dispersed and tiny hardening constituent of alloy,
To make alloy have both excellent room temperature and high-temperature behavior.Heat treatment through the invention, alloying component are stablized, and crystal grain is not bright
Aobvious to grow up, the performance of alloy is significantly improved, and method is simple, securely and reliably, easy to operate.
The present invention have it is following the utility model has the advantages that
High-toughness heat-resistant casting Mg-Y alloy of the invention is heat-treated through low pressure casting, second level solution treatment and artificial aging
Afterwards, room temperature tensile intensity reaches 305MPa, elongation percentage 19%；Drawing by high temperature tensile strength reaches 210MPa, elongation percentage at 200 DEG C
26%, comprehensive performance reaches the performance of the cast aluminium alloy golds such as A380；Provided preparation method have simple process, it is high-efficient,
The advantages that being suitble to large-scale production, meet the high demand that aerospace, military project, automobile and other industries develop lightweight.
Detailed description of the invention
Fig. 1 is the magnesium alloy cast metallographic structure figure obtained in embodiment 3.
Specific embodiment
Embodiment 1
The weight percent of high-toughness heat-resistant casting Mg-Y alloy are as follows: press stoichiometric, 2.5%Y, 1.0%Zn, 0.5%
Al, 0.3%Mn, 0.01%Ti, 0.01%B, surplus are Mg and other inevitable impurity.Preparation method:
(1) with due regard to after scaling loss, by above-mentioned Mg-Y alloying component and stoichiometric ratio, the dosage of raw material needed for calculating；
Technical pure magnesium ingot, industrial-purity zinc, technical pure aluminium ingot and MgY25 and MgMn10 intermediate alloy are removed into removing oxide layer and dry preheating
To 200 DEG C.
(2) after the technical pure magnesium ingot for accounting for crucible height 25% being fused into molten bath at 680 DEG C, it is passed through protective gas argon
Remaining magnesium ingot is added in gas.
(3) after magnesium ingot all fusing, 700 DEG C are warming up to, by industrial-purity zinc and MgY25 and MgMn10 intermediate alloy point 2
~4 additions, and keep temperature constant at 700 DEG C, it is stirred until all melting, and keep the temperature 30min.
(4) 40~60min before low pressure casting, is warming up to 730 DEG C, technical pure aluminium ingot to be sequentially added, AlTi5B1,
AlB3 intermediate alloy is all after fusing, and the refining agent that raw material weight 1% is added is refined, 730 DEG C of the temperature of refining, at refining
The mixing time 10min of reason, refining agent component is by mass percentage are as follows: 55%KCl, 25%CaCl2, 5%CaF2, 15%
BaCl2.Furnace temperature is risen into 750 DEG C of heat preservations and stands 10min, promotion is mingled with sedimentation, obtains magnesium alloy fused mass.
(5) magnesium alloy fused mass is cooled to 720 DEG C to remove the gred, sand mold mould temperature is 25 DEG C.Low pressure casting mistake
Journey is controlled and is classified pressurization by proportioning valve, comprising: is risen liquid, is filled type, pressurization, pressure maintaining, release stage, wherein rises liquid rank
The pressure of section is uniformly increased to 0.02MPa, pressing time 5s；The pressure for filling the type stage is uniformly increased to 0.08MPa, molten metal
It is full of casting mold type chamber under stress；The pressure of pressurization stages is uniformly increased to 0.1MPa, pressing time 10s；Packing stage
Dwell time is 200s.Prepared As-cast High Strength Toughness heat-resistant cast Mg-Y alloy is taken out after release.
(6) second level solution treatment is successively carried out to the resulting cast alloy of low pressure casting, casting alloy is put into solid solution furnace
It is interior, 200 DEG C are warming up to 5 DEG C/min, is passed through the SF containing 0.2% volume fraction6And CO2Mixed gas, continue with 5 DEG C/min
480 DEG C of first order solid solubility temperature are warming up to, 36h is kept the temperature, is then warming up to 535 DEG C of second level solid solubility temperature at a slow speed with 10 DEG C/h,
Water hardening is carried out on fast transfer to quenching unit after heat preservation 1h.
(7) artificial aging processing is carried out to the casting alloy after solution treatment, quenched alloy is put into aging furnace,
Be warming up to 185 DEG C of artificial aging treatment temperature with 5 DEG C/min, keep the temperature to come out of the stove after 12h and be air-cooled to room temperature, obtain it is described be suitable for it is low
The high-toughness heat-resistant Mg-Y alloy that die casting is made.
High-toughness heat-resistant Mg-Y alloy obtained is subjected to a. room temperature tensile test respectively；B.200 DEG C, at 200h heat exposure
In 200 DEG C of progress high temperature tensile properties tests after reason.The freezing range for the high-toughness heat-resistant Mg-Y alloy that this example obtains is 80
DEG C, room temperature tensile intensity is 280MPa, elongation percentage 23%；Drawing by high temperature tensile strength is 185MPa, elongation percentage at 200 DEG C
32%.
Embodiment 2
The weight percent of high-toughness heat-resistant casting Mg-Y alloy are as follows: press stoichiometric, 5.0%Y, 4.0%Zn, 1.2%
Al, 0.1%Mn, 0.08%Ti, surplus are Mg and other inevitable impurity.Preparation method:
(1) with due regard to after scaling loss, by above-mentioned Mg-Y alloying component and stoichiometric ratio, the dosage of raw material needed for calculating；
Technical pure magnesium ingot, industrial-purity zinc, technical pure aluminium ingot and MgY30 and MgMn10 intermediate alloy are removed into removing oxide layer and dry preheating
To 200 DEG C.
(2) it after the technical pure magnesium ingot for accounting for crucible height 25% being fused into molten bath at 680 DEG C, is passed through protective gas and contains
The SF of 0.2% volume fraction6And CO2Mixed gas, remaining magnesium ingot is added.
(3) after magnesium ingot all fusing, 700 DEG C are warming up to, by industrial-purity zinc and MgY30 and MgMn10 intermediate alloy point 2
~4 additions, and keep temperature constant at 700 DEG C, it is stirred until all melting, and keep the temperature 30min.
(4) 40~60min before low pressure casting is warming up to 730 DEG C, closes among technical pure aluminium ingot to be sequentially added, AlTi5
After golden all fusings, the refining agent that raw material weight 3.5% is added is refined, 730 DEG C of the temperature of refining, the stirring of refining treatment
Time 10min, refining agent component is by mass percentage are as follows: 55%KCl, 25%CaCl2, 5%CaF2, 15%BaCl2.By furnace temperature
It rises to 750 DEG C of heat preservations and stands 20min, promotion is mingled with sedimentation, obtains magnesium alloy fused mass.
(5) magnesium alloy fused mass is cooled to 720 DEG C to remove the gred, preheats sand mold mould temperature to 150 DEG C.Low pressure casting
It makes process and is controlled and be classified pressurization by proportioning valve, comprising: rise liquid, fill type, pressurization, pressure maintaining, release stage, wherein rise
The pressure in liquid stage is uniformly increased to 0.05MPa, pressing time 8s；The pressure for filling the type stage is uniformly increased to 0.08MPa, gold
Belong to liquid and is full of casting mold type chamber under stress；The pressure of pressurization stages is uniformly increased to 0.1MPa, pressing time 15s；Pressure maintaining rank
The dwell time of section is 300s.Prepared As-cast High Strength Toughness heat-resistant cast Mg-Y alloy is taken out after release.
(6) second level solution treatment is successively carried out to the resulting cast alloy of low pressure casting, casting alloy is put into solid solution furnace
It is interior, 200 DEG C are warming up to 5 DEG C/min, is passed through protective gas argon gas, continues to be warming up to first order solid solubility temperature 490 with 5 DEG C/min
DEG C, 48h is kept the temperature, is then warming up to 545 DEG C of second level solid solubility temperature at a slow speed with 10 DEG C/h, keeps the temperature after 2h fast transfer to quenching dress
Set carry out water hardening.
(7) artificial aging processing is carried out to the casting alloy after solution treatment, quenched alloy is put into aging furnace,
Be warming up to 215 DEG C of artificial aging treatment temperature with 5 DEG C/min, keep the temperature to come out of the stove after 36h and be air-cooled to room temperature, obtain it is described be suitable for it is low
The high-toughness heat-resistant Mg-Y alloy that die casting is made.
High-toughness heat-resistant Mg-Y alloy obtained is subjected to a. room temperature tensile test respectively；B.200 DEG C, at 200h heat exposure
In 200 DEG C of progress high temperature tensile properties tests after reason.The freezing range of high-toughness heat-resistant Mg-Y alloy is 40 DEG C in this example, room
Warm tensile strength is 305MPa, elongation percentage 19%；Drawing by high temperature tensile strength is 210MPa, elongation percentage 26% at 200 DEG C.
Embodiment 3
The weight percent of high-toughness heat-resistant casting Mg-Y alloy are as follows: press stoichiometric, 3.0%Y, 2.0%Zn, 1.0%
Al, 0.2%Mn, 0.05%Ti, 0.03%B, surplus are Mg and other inevitable impurity.Preparation method:
(1) with due regard to after scaling loss, by above-mentioned Mg-Y alloying component and stoichiometric ratio, the dosage of raw material needed for calculating；
Technical pure magnesium ingot, industrial-purity zinc, technical pure aluminium ingot and MgY30 and MgMn10 intermediate alloy are removed into removing oxide layer and dry preheating
To 200 DEG C.
(2) after the technical pure magnesium ingot for accounting for crucible height 25% being fused into molten bath at 680 DEG C, it is passed through protective gas argon
Remaining magnesium ingot is added in gas.
(3) after magnesium ingot all fusing, 700 DEG C are warming up to, by industrial-purity zinc and MgY30 and MgMn10 intermediate alloy point 2
~4 additions, and keep temperature constant at 700 DEG C, it is stirred until all melting, and keep the temperature 30min.
(4) 40~60min before low pressure casting is warming up to 730 DEG C, technical pure aluminium ingot to be sequentially added, AlTi10, AlB8
Intermediate alloy is all after fusing, and the refining agent that raw material weight 2.5% is added is refined, 720 DEG C of the temperature of refining, refining treatment
Mixing time 15min, refining agent component is by mass percentage are as follows: 55%KCl, 25%CaCl2, 5%CaF2, 15%BaCl2。
Furnace temperature is risen into 750 DEG C of heat preservations and stands 15min, promotion is mingled with sedimentation, obtains magnesium alloy fused mass.
(5) magnesium alloy fused mass is cooled to 730 DEG C to remove the gred, preheated metallic type mold temperature is 180 DEG C.Low pressure
Casting process is controlled and is classified pressurization by proportioning valve, comprising: is risen liquid, is filled type, pressurization, pressure maintaining, release stage, wherein
The pressure for rising the liquid stage is uniformly increased to 0.03MPa, pressing time 6s；The pressure for filling the type stage is uniformly increased to 0.08MPa,
Molten metal is full of casting mold type chamber under stress；The pressure of pressurization stages is uniformly increased to 0.1MPa, pressing time 12s；Pressure maintaining
The dwell time in stage is 250s.Prepared As-cast High Strength Toughness heat-resistant cast Mg-Y alloy is taken out after release.
(6) second level solution treatment is successively carried out to the resulting cast alloy of low pressure casting, casting alloy is put into solid solution furnace
It is interior, 200 DEG C are warming up to 5 DEG C/min, is passed through protective gas argon gas, continues to be warming up to first order solid solubility temperature 485 with 5 DEG C/min
DEG C, 42h is kept the temperature, is then warming up to 540 DEG C of second level solid solubility temperature at a slow speed with 10 DEG C/h, fast transfer extremely quenches after keeping the temperature 1.5h
Water hardening is carried out on device.
(7) artificial aging processing is carried out to the casting alloy after solution treatment, quenched alloy is put into aging furnace,
Be warming up to 200 DEG C of artificial aging treatment temperature with 5 DEG C/min, heat preservation is come out of the stove afterwards for 24 hours is air-cooled to room temperature, obtain it is described be suitable for it is low
The high-toughness heat-resistant Mg-Y alloy that die casting is made.
High-toughness heat-resistant Mg-Y alloy obtained is subjected to a. room temperature tensile test respectively；B.200 DEG C, at 200h heat exposure
In 200 DEG C of progress high temperature tensile properties tests after reason.The freezing range for the high-toughness heat-resistant Mg-Y alloy that this example obtains is 50
DEG C, room temperature tensile intensity is 295MPa, elongation percentage 17%；Drawing by high temperature tensile strength is 193MPa, elongation percentage at 200 DEG C
25%.The magnesium alloy cast metallographic structure figure that the present embodiment obtains is as shown in Figure 1.
Embodiment 4
The weight percent of high-toughness heat-resistant casting Mg-Y alloy are as follows: press stoichiometric, 4.0%Y, 4.0%Zn, 1.0%
Al, 0.2%Mn, 0.08%B, surplus are Mg and other inevitable impurity.Preparation method:
(1) with due regard to after scaling loss, by above-mentioned Mg-Y alloying component and stoichiometric ratio, the dosage of raw material needed for calculating；
Technical pure magnesium ingot, industrial-purity zinc, technical pure aluminium ingot and MgY30 and MgMn10 intermediate alloy are removed into removing oxide layer and dry preheating
To 200 DEG C.
(2) it after the technical pure magnesium ingot for accounting for crucible height 25% being fused into molten bath at 680 DEG C, is passed through containing 0.2% volume
The SF of score6And CO2Hybrid protection gas, remaining magnesium ingot is added.
(3) after magnesium ingot all fusing, 700 DEG C are warming up to, by industrial-purity zinc and MgY30 and MgMn10 intermediate alloy point 2
~4 additions, and keep temperature constant at 700 DEG C, it is stirred until all melting, and keep the temperature 30min.
(4) 40~60min before low pressure casting is warming up to 730 DEG C, closes among technical pure aluminium ingot to be sequentially added, AlB8
After golden all fusings, the refining agent that raw material weight 3.0% is added is refined, 720 DEG C of the temperature of refining, the stirring of refining treatment
Time 15min, refining agent component is by mass percentage are as follows: 55%KCl, 25%CaCl2, 5%CaF2, 15%BaCl2.By furnace temperature
It rises to 750 DEG C of heat preservations and stands 10min, promotion is mingled with sedimentation, obtains magnesium alloy fused mass.
(5) magnesium alloy fused mass is cooled to 740 DEG C to remove the gred, preheated metallic type mold temperature is to 250 DEG C.Low pressure
Casting process is controlled and is classified pressurization by proportioning valve, comprising: is risen liquid, is filled type, pressurization, pressure maintaining, release stage, wherein
The pressure for rising the liquid stage is uniformly increased to 0.04MPa, pressing time 8s；The pressure for filling the type stage is uniformly increased to 0.08MPa,
Molten metal is full of casting mold type chamber under stress；The pressure of pressurization stages is uniformly increased to 0.1MPa, pressing time 12s；Pressure maintaining
The dwell time in stage is 220s.Prepared As-cast High Strength Toughness heat-resistant cast Mg-Y alloy is taken out after release.
(6) second level solution treatment is successively carried out to the resulting cast alloy of low pressure casting, casting alloy is put into solid solution furnace
It is interior, 200 DEG C are warming up to 5 DEG C/min, is passed through the SF containing 0.2% volume fraction6And CO2Hybrid protection gas, continue with 5 DEG C/
Min is warming up to 480 DEG C of first order solid solubility temperature, keeps the temperature 48h, is then warming up to second level solid solubility temperature 535 at a slow speed with 10 DEG C/h
DEG C, water hardening is carried out on fast transfer to quenching unit after heat preservation 2h.
(7) artificial aging processing is carried out to the casting alloy after solution treatment, quenched alloy is put into aging furnace,
Be warming up to 185 DEG C of artificial aging treatment temperature with 5 DEG C/min, keep the temperature to come out of the stove after 36h and be air-cooled to room temperature, obtain it is described be suitable for it is low
The high-toughness heat-resistant Mg-Y alloy that die casting is made.
High-toughness heat-resistant Mg-Y alloy obtained is subjected to a. room temperature tensile test respectively；B.200 DEG C, at 200h heat exposure
In 200 DEG C of progress high temperature tensile properties tests after reason.The freezing range for the high-toughness heat-resistant Mg-Y alloy that this example obtains is 43
DEG C, room temperature tensile intensity is 300MPa, elongation percentage 18%；Drawing by high temperature tensile strength is 207MPa, elongation percentage at 200 DEG C
23%.
Embodiment 5
The weight percent of high-toughness heat-resistant casting Mg-Y alloy are as follows: press stoichiometric, 4.0%Y, 1.2%Zn, 0.8%
Al, 0.3%Mn, 0.04%Ti, 0.04%B, surplus are Mg and other inevitable impurity.Preparation method:
(1) with due regard to after scaling loss, by above-mentioned Mg-Y alloying component and stoichiometric ratio, the dosage of raw material needed for calculating；
Technical pure magnesium ingot, industrial-purity zinc, technical pure aluminium ingot and MgY30 and MgMn10 intermediate alloy are removed into removing oxide layer and dry preheating
To 200 DEG C；By the ingredient and stoichiometric ratio of alloy, the dosage of raw material needed for calculating.
(2) after the technical pure magnesium ingot for accounting for crucible height 25% being fused into molten bath at 680 DEG C, it is passed through protective gas argon
Remaining magnesium ingot is added in gas.
(3) after magnesium ingot all fusing, 700 DEG C are warming up to, by industrial-purity zinc and MgY30 and MgMn10 intermediate alloy point 2
~4 additions, and keep temperature constant at 700 DEG C, it is stirred until all melting, and keep the temperature 30min.
(4) 40~60min before low pressure casting is warming up to 730 DEG C, technical pure aluminium ingot to be sequentially added, AlTi5, AlB3
After intermediate alloy is sequentially added and all melted, the refining agent that raw material weight 2.0% is added is refined, the temperature 730 of refining
DEG C, the mixing time 10min of refining treatment, refining agent component is by mass percentage are as follows: 55%KCl, 25%CaCl2, 5%CaF2、
15%BaCl2.Furnace temperature is risen into 750 DEG C of heat preservations and stands 15min, promotion is mingled with sedimentation, obtains magnesium alloy fused mass.
(5) magnesium alloy fused mass is cooled to 720 DEG C to remove the gred, preheats sand mold mould temperature to 100 DEG C.Low pressure casting
It makes process and is controlled and be classified pressurization by proportioning valve, comprising: rise liquid, fill type, pressurization, pressure maintaining, release stage, wherein rise
The pressure in liquid stage is uniformly increased to 0.05MPa, pressing time 5s；The pressure for filling the type stage is uniformly increased to 0.08MPa, gold
Belong to liquid and is full of casting mold type chamber under stress；The pressure of pressurization stages is uniformly increased to 0.1MPa, pressing time 15s；Pressure maintaining rank
The dwell time of section is 300s.Prepared As-cast High Strength Toughness heat-resistant cast Mg-Y alloy is taken out after release.
(6) second level solution treatment is successively carried out to the resulting cast alloy of low pressure casting, casting alloy is put into solid solution furnace
It is interior, 200 DEG C are warming up to 5 DEG C/min, is passed through the SF containing 0.2% volume fraction6And CO2Hybrid protection gas, continue with 5 DEG C/
Min is warming up to 490 DEG C of first order solid solubility temperature, keeps the temperature 36h, is then warming up to second level solid solubility temperature 545 at a slow speed with 10 DEG C/h
DEG C, water hardening is carried out on fast transfer to quenching unit after heat preservation 1h.
(7) artificial aging processing is carried out to the casting alloy after solution treatment, quenched alloy is put into aging furnace,
Be warming up to 215 DEG C of artificial aging treatment temperature with 5 DEG C/min, keep the temperature to come out of the stove after 12h and be air-cooled to room temperature, obtain it is described be suitable for it is low
The high-toughness heat-resistant Mg-Y alloy that die casting is made.
High-toughness heat-resistant Mg-Y alloy obtained is subjected to a. room temperature tensile test respectively；B.200 DEG C, at 200h heat exposure
In 200 DEG C of progress high temperature tensile properties tests after reason.The freezing range of high-toughness heat-resistant Mg-Y alloy is 74 DEG C in this example, room
Warm tensile strength is 285MPa, elongation percentage 16%；Drawing by high temperature tensile strength is 200MPa, elongation percentage 28% at 200 DEG C.
Above-described embodiment is not limit the invention in any way, all to be obtained by the way of equivalent substitution or equivalent transformation
Technical solution fall within the scope of protection of the present invention.
Claims (13)
1. being suitable for the high-toughness heat-resistant Mg-Y alloy of low pressure casting, it is characterised in that the element including following mass percent: 2.5
~5.0%Y, 1.0~4.0%Zn, 0.5~1.2%Al, 0.1~0.3%Mn, 0.01~0.08%M, surplus are Mg and other
Inevitable impurity；Wherein, one or both of M Ti, B.
2. being suitable for the high-toughness heat-resistant Mg-Y alloy of low pressure casting as described in claim 1, it is characterised in that: Zn/Y mass ratio
It is 0.3~1.0.
3. being suitable for the high-toughness heat-resistant Mg-Y alloy of low pressure casting as described in claim 1, it is characterised in that: (Zn+Al)/with
Y mass ratio is 0.5~1.2.
4. the preparation method of the high-toughness heat-resistant Mg-Y alloy as claimed in any one of claims 1 to 3 suitable for low pressure casting,
It is characterized in that, includes the following steps:
(1) Mg-Y alloying component and stoichiometric ratio are pressed, calculate technical pure magnesium ingot, industrial-purity zinc, technical pure aluminium ingot, among Mg-Y
The dosage of alloy, Mg-Mn intermediate alloy, Al-Ti intermediate alloy, Al-Ti-B intermediate alloy and Al-B intermediate alloy；By technical pure
Magnesium ingot, industrial-purity zinc, technical pure aluminium ingot and Mg-Y and Mg-Mn intermediate alloy remove removing oxide layer and dry to be preheated to 200 DEG C；
(2) after the technical pure magnesium ingot for accounting for crucible height 25% being fused into molten bath, it is passed through protective gas, remaining magnesium ingot is added；
(3) after magnesium ingot all fusing, 700 DEG C are warming up to, by industrial-purity zinc, Mg-Y intermediate alloy and Mg-Mn intermediate alloy point
It is repeatedly added, and keeps temperature constant at 700 DEG C, be stirred until all melting, and keep the temperature 30min；
(4) 40~60min before low pressure casting, is warming up to 730 DEG C, technical pure aluminium ingot to be sequentially added, Al-Ti intermediate alloy,
Al-Ti-B intermediate alloy, Al-B intermediate alloy all after fusing, are added refining agent and are refined, furnace temperature is risen to 750 DEG C of heat preservations
10~20min is stood, promotion is mingled with sedimentation, obtains magnesium alloy fused mass；
(5) magnesium alloy fused mass is cooled between 720~740 DEG C and is removed the gred, preheating sand mold type molds temperature to 25~
150 DEG C or metal type dies temperature are to 180~250 DEG C；Low pressure casting process is controlled and is classified pressurization by proportioning valve, low
Pressure casting process includes: a liter liquid, fills type, pressurization, pressure maintaining, release stage, wherein the pressure for rising the liquid stage is uniformly increased to
0.02-0.05MPa, pressing time control in 5~8s；The pressure for filling the type stage is uniformly increased to 0.08MPa, and molten metal is in pressure
It is full of casting mold type chamber down；The pressure of pressurization stages is uniformly increased to 0.1MPa, and pressing time controls in 10~15s；Packing stage
Dwell time control in 200~300s；Prepared As-cast High Strength Toughness heat-resistant cast Mg-Y alloy is taken out after release；
(6) second level solution treatment is successively carried out to the resulting cast alloy of low pressure casting, artificial aging processing obtains required height
Tough heat-resisting Mg-Y alloy.
5. the preparation method suitable for the high-toughness heat-resistant Mg-Y alloy of low pressure casting as claimed in claim 4, it is characterised in that:
The Mg-Y intermediate alloy is MgY25 or MgY30；The Mg-Mn intermediate alloy is MgMn10；The Al-Ti-B intermediate alloy
For AlTi5B1；The Al-B intermediate alloy is AlB3 or AlB8；The Al-Ti intermediate alloy is AlTi5 or AlTi10.
6. the preparation method suitable for the high-toughness heat-resistant Mg-Y alloy of low pressure casting as claimed in claim 4, it is characterised in that:
The mass percent component of the refining agent are as follows: 55%KCl, 25%CaCl2, 5%CaF2, 15%BaCl2。
7. the preparation method suitable for the high-toughness heat-resistant Mg-Y alloy of low pressure casting as claimed in claim 4, it is characterised in that:
The refining agent additive amount is the 1.0~3.5% of raw material gross weight.
8. the preparation method suitable for the high-toughness heat-resistant Mg-Y alloy of low pressure casting as claimed in claim 4, it is characterised in that:
Refining temperature when refining agent refining is added is 720~730 DEG C, 10~15min of mixing time of refining treatment.
9. the preparation method suitable for the high-toughness heat-resistant Mg-Y alloy of low pressure casting as claimed in claim 4, it is characterised in that:
The second level solid solution treatment process parameter are as follows: 480~490 DEG C of first order solid solubility temperature, 36~48h of soaking time；The second level is solid
535~545 DEG C of solubility temperature, 1~2h of soaking time.
10. the preparation method suitable for the high-toughness heat-resistant Mg-Y alloy of low pressure casting, feature exist as claimed in claim 9
In: the second level solid solution treatment process the step of are as follows: cast alloy is put into solid solution furnace, is warming up to 200 DEG C with 5 DEG C/min,
It is passed through protective gas, continues to be warming up to 480~490 DEG C of first order solid solubility temperature with 5 DEG C/min, keeps the temperature 36~48h；Then with 10
DEG C/h is warming up at a slow speed 535~545 DEG C of second level solid solution temperature, fast transfer is enterprising to quenching unit after keeping the temperature 1~2h
Row water hardening.
11. the preparation method of the high-toughness heat-resistant Mg-Y alloy suitable for low pressure casting as described in claim 4 or 10, feature
It is: the SF that the protective gas is argon gas or volume fraction is 0.2%6And CO2Mixed gas.
12. the preparation method suitable for the high-toughness heat-resistant Mg-Y alloy of low pressure casting, feature exist as claimed in claim 4
In: the artificial aging treatment process parameter: 185~215 DEG C of aging temp, 12~36h of soaking time.
13. the preparation method suitable for the high-toughness heat-resistant Mg-Y alloy of low pressure casting, feature exist as claimed in claim 12
In: the artificial aging treatment process the step of are as follows: quenched alloy is put into aging furnace, is warming up to people with 5 DEG C/min
It 185~215 DEG C of work aging temperature, comes out of the stove after keeping the temperature 12~36h and is air-cooled to room temperature.
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| CN101693971A (en) * | 2009-10-27 | 2010-04-14 | 上海交通大学 | Low-pressure casting preparation method of heat resistant rare earth-magnesium alloy engine pistons |
| CN101713042A (en) * | 2009-11-13 | 2010-05-26 | 大连交通大学 | Quasicrystal reinforced magnesium alloy and semisolid preparation method thereof |
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2019
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| CN101693971A (en) * | 2009-10-27 | 2010-04-14 | 上海交通大学 | Low-pressure casting preparation method of heat resistant rare earth-magnesium alloy engine pistons |
| CN101713042A (en) * | 2009-11-13 | 2010-05-26 | 大连交通大学 | Quasicrystal reinforced magnesium alloy and semisolid preparation method thereof |
| CN102994834A (en) * | 2011-09-09 | 2013-03-27 | 江汉大学 | Heatproof magnesium alloy containing Nb |
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