CN109295369A - One kind magnesium alloy containing cerium mischmetal and its heat treatment method - Google Patents
One kind magnesium alloy containing cerium mischmetal and its heat treatment method Download PDFInfo
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- CN109295369A CN109295369A CN201811407881.3A CN201811407881A CN109295369A CN 109295369 A CN109295369 A CN 109295369A CN 201811407881 A CN201811407881 A CN 201811407881A CN 109295369 A CN109295369 A CN 109295369A
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- magnesium alloy
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C23/00—Alloys based on magnesium
- C22C23/06—Alloys based on magnesium with a rare earth metal as the next major constituent
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/06—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of magnesium or alloys based thereon
Abstract
The invention discloses a kind of magnesium alloy containing cerium mischmetal and its heat treatment methods；The component and its weight percent of the magnesium alloy are as follows: 0.80~1.20%Nd, 0.80~1.20%Ce, 0.45~0.65%Zn, 0.30~0.70%Zr, the total amount of impurity element S i, Fe, Cu and Ni are less than 0.20%, surplus Mg.After conventional method melting and casting, solution treatment in 535~545 DEG C × 6~16 hours is first passed through, carries out 195~205 DEG C × 8~16 hours ageing treatments, the magnesium alloy containing cerium mischmetal of available good mechanical performance after hardening again.Cost is relatively low for the magnesium alloy material, while having superior room-temperature mechanical property, tensile strength >=230MPa, yield strength >=130MPa, elongation >=7%, can be used for preparing the lightweight structures part such as automotive hub.
Description
Technical field
The invention belongs to class of metal materials and field of metallurgy, and in particular to one kind magnesium alloy containing cerium mischmetal and its heat treatment side
Method.
Background technique
As most light structural metallic materials, magnesium alloy has many advantages, such as that specific strength, specific stiffness are high, and damping property is good, extensively
Applied to fields such as aerospace, traffic, 3C.In existing magnesium alloy, Chinese invention patent 200510030457.8 is disclosed
A kind of high-strength cast Mg alloy containing rare-earth, the Exemplary chemical ingredient of the alloy are Mg-3.0Nd-0.2Zn-Zr (wt.%), casting
Make the typical room temperature tensile property of alloy are as follows: yield strength 140MPa, tensile strength 300MPa, elongation percentage 11%.The alloy is same
When have good corrosion resistance, can satisfy a variety of application demands in the fields such as aerospace, traffic, 3C, have been used to
Prepare the primary load bearings component such as aircraft engine casing, automotive hub, engine cylinder body.However, rare earth element nd valence in recent years
Lattice Continued seriously limits the alloy in the application of automobile and the field 3C, thus there is an urgent need to develop mechanical property quite,
The lower magnesium alloy of cost.
Summary of the invention
The purpose of the present invention is in showing for Mg-3.0Nd-0.2Zn-Zr (wt.%) rare-earth-contained magnesium alloy higher cost
Shape, it is intended to develop that cost is relatively low, while meet room temperature tensile intensity >=210MPa, yield strength >=130MPa, elongation >=
7% automotive hub cast rare earth magnesium alloy.
The purpose of the present invention is what is be achieved through the following technical solutions:
In a first aspect, it includes percentages such as the following group the present invention provides a kind of magnesium alloy containing cerium mischmetal
Point:
Surplus is magnesium and inevitable impurity, and the weight percent summation of the impurity element is no more than 0.2wt%.
The present invention uses Nd (neodymium) for the first component.Since solid solubility of the Nd in Mg is almost nil at 200 DEG C, and altogether
Solid solubility at 552 DEG C of brilliant temperature is 3.6wt.%, as long as therefore when a small amount of Nd is added can guarantee that alloy has good
Imitate precipitating reinforcing effect.In this patent, it is contemplated that Nd element higher cost, in order to drop the low-alloyed cost of raw material, Nd's contains
Amount control is in 0.80~1.20wt.%.
The present invention uses Ce (cerium) for the second component.Solid solubility of the Ce element in Mg be not high, only up to
0.50wt.%, Ce element and Mg form eutectic phase Mg12Ce, eutectic phase are distributed on α-Mg crystal boundary more, can play the second phase more
Invigoration effect is dissipated, compensates for the negative effect reduced due to Nd content to a certain extent.In system of the invention, Ce element
When content is lower, the Mg of crystal boundary formation12The strengthening effect of Ce disperse phase is weaker, when Ce constituent content is higher, what crystal boundary was formed
Mg12Ce disperse phase size is larger, the temperature-room type plasticity of meeting severe exacerbation alloy.Therefore, the control of Ce content 0.80~
1.20wt.%.
The present invention uses Zn (zinc) for third component.It, can be with Mg and Nd element shape when Mg-Nd alloy system is added in Zn element
At basal plane precipitated phase, to strengthen to alloy.When Zn constituent content is lower, when < 0.45wt.%, Mg-Nd-Ce-Zn alloy
In ageing strengthening mutually based on prismatic surface precipitated phase, strengthening effect is preferable, better than be free of Zn element alloy；When Zn element contains
For amount in 0.45~0.65wt.%, for the ageing strengthening in alloy mutually based on basal plane precipitated phase, strengthening effect is best；When Zn member
When cellulose content > 0.65wt.%, Zn can form Mg-Nd-Zn ternary eutectic phase with Mg, Nd, such is mutually in subsequent solution treatment
It is difficult to all be dissolved into matrix and exist in the form of the second phase of disperse, the room of meeting attacking material while improving alloy strength
Warm plasticity.Therefore, according to Zn element to the combined influence of alloy strength of the present invention and plasticity, the control of Zn content 0.45~
0.65wt.%.
The present invention uses Zr (zirconium) for the 4th component, and similar with conventional magnesium alloy containing Zr, Zr is in Mg-Nd-Ce-Zn alloy
Main function be crystal grain refinement, the content of Zr element is 0.30~0.70wt.%.
Preferably, the impurity element includes at least one of silicon, iron, copper, nickel, and the content of element silicon is not
The content for being no more than 0.03%, nickel element no more than the content of 0.01%, copper more than the content of 0.01%, ferro element does not surpass
Cross 0.005%.
Second aspect, the present invention also provides a kind of heat treatment methods of above-mentioned magnesium alloy containing cerium mischmetal comprising such as
Lower step:
By conventional method preparation the ingot of magnesium alloy containing cerium mischmetal or casting at 535~545 DEG C solution treatment 6~
14 hours, quenching-in water；
Single-stage aging is carried out at 195~205 DEG C and handles 6~16h, obtains the magnesium alloy containing cerium mischmetal.The alloy room
Warm mechanical property meets: tensile strength >=210MPa, yield strength >=130MPa, elongation >=7% can be used for preparing automotive wheels
The structural members such as hub.
Preferably, the temperature of the quenching is 25~80 DEG C.Alloy from solid solution furnace be fetched into water when
Between interval be no more than 30 seconds.
The preparation of the alloy pig or casting of the above-mentioned magnesium alloy containing cerium mischmetal includes the following steps:
Pure magnesium SF has been put into6/CO2It is melted in the crucible electrical resistance furnace of gas shield；
After magnesium liquid temperature reaches 720 DEG C, pure zinc and Mg-25wt.%Nd/Mg-20wt.%Ce are directly added into magnesium liquid
Intermediate alloy makes Zn element account for 0.45~0.65wt.% in the magnesium alloy gross mass of preparation, and Nd element accounts for 0.80~
1.20wt.%, Ce element account for 0.80~1.20wt.%；
After the fusing of Mg-25wt.%Nd/Mg-20wt.%Ce intermediate alloy, melt temperature adds when rising to 760~780 DEG C
Enter Mg-30wt.%Zr intermediate alloy, Zr element is made to account for 0.30~0.70wt.% in the magnesium alloy gross mass of preparation；
Surface scum is skimmed after the fusing of Mg-30wt.%Zr intermediate alloy, is stirred 2~3 minutes；It is cooled to 750~755
DEG C, electrorefining is warming up to 780 DEG C of standings after refining, time of repose is 25~40 minutes；
Surface scum is skimmed after being cooled to 690~740 DEG C after standing carries out metal gravity casting.
Compared with prior art, the present invention have it is following the utility model has the advantages that
(1) compared with Chinese invention patent 200510030457.8, the present invention is by using the market price lower (0.8
~1.2wt.%) Ce element is instead of~2wt.%Nd element, in the case where reducing alloy yield strength on a small quantity, significantly reduces
The cost of raw material of alloy, is conducive to the popularization and application of magnesium alloy, especially application of the magnesium alloy on automotive hub.This hair
The bright cost that develops is lower and can satisfy the magnesium alloy containing cerium mischmetal of automotive hub requirement, has significant innovative.
(2) with the Mg-Nd-Zn-Zr alloy in Chinese invention patent 200510030457.8 based on prismatic surface precipitated phase
The mode of need to strengthen is compared, and the main hardening constituent of the Mg-Nd-Ce-Zn-Zr alloy in the present invention is basal plane precipitated phase and Mg12Ce is more
It dissipates the second phase (as shown in Figure 1).Although the strengthening effect (room-temperature yield strength) of two class alloys is close, strengthening mechanism difference is aobvious
It writes.Therefore, the present invention also has significant innovative in terms of alloy strengthening mechanismic design.
Detailed description of the invention
Upon reading the detailed description of non-limiting embodiments with reference to the following drawings, other feature of the invention,
Objects and advantages will become more apparent upon:
Fig. 1 is that the basal plane that Mg-Nd-Ce-Zn-Zr alloy is formed in magnesium matrix after being dissolved & ageing treatment (T6) is precipitated
The second phase (b) of phase (a) and Dispersed precipitate in grain boundaries.
Specific embodiment
The present invention is described in detail combined with specific embodiments below.Following embodiment will be helpful to the technology of this field
Personnel further understand the present invention, but the invention is not limited in any way.It should be pointed out that the ordinary skill of this field
For personnel, without departing from the inventive concept of the premise, various modifications and improvements can be made.These belong to the present invention
Protection scope.
Embodiment 1
The present embodiment is related to a kind of magnesium alloy containing cerium mischmetal, the component and its mass percent of the magnesium alloy are as follows:
0.80wt.%Nd, 0.80wt.%Ce, 0.45wt.%Zn, 0.40wt.%Zr, the total content of impurity element S i, Fe, Cu and Ni
Less than 0.20wt.%, surplus is that (wt.% refers to that component accounts for the percentage of prepared magnesium alloy gross mass to Mg, and gross mass is
The quality of Mg, Zn and various intermediate alloys and).
The present embodiment is related to the alloy heat treatment method in the casting method and the present invention of conventional rare magnesium alloy:
Wherein, founding process is in SF6And CO2It is carried out under the conditions of mixed gas protected, steps are as follows:
(1) baking material: pure magnesium, pure zinc, Mg-Nd/Mg-Ce/Mg-Zr intermediate alloy are preheated 3 hours at 200 DEG C or more；
(2) it melts magnesium: the pure magnesium after drying has been put into SF6/CO2It is melted in the crucible electrical resistance furnace of gas shield；
(3) add Zn and Nd/Ce: after magnesium liquid temperature reaches 720 DEG C, pure zinc and Mg-25wt.% are directly added into magnesium liquid
Nd/Mg-20wt.%Ce intermediate alloy, makes Zn element account for 0.45wt.% in the magnesium alloy gross mass of preparation, and Nd element accounts for
0.80wt.%, Ce element account for 0.80wt.%；
(4) after the fusing of Mg-Nd/Mg-Ce intermediate alloy, Mg-30wt.% is added when rising to 760~780 DEG C in melt temperature
Zr intermediate alloy is skimmed surface scum after the fusing of Mg-Zr intermediate alloy, is stirred 2~3 minutes.750~755 DEG C are cooled to, no
Power-off refining, is warming up to 780 DEG C of standings after refining, time of repose is 25~40 minutes.
(5) magnesium liquid skims surface scum and carries out metal gravity casting after standing after being cooled to 690~740 DEG C, obtains Mg-
0.80Nd-0.80Ce-0.45Zn-0.40Zr magnesium-rare earth.
Heat treatment procedure are as follows:
It is small that the Mg-0.80Nd-0.80Ce-0.45Zn-0.40Zr alloy pig that melting is obtained carries out 6 in 540 DEG C of temperature
When solution treatment single-stage aging processing in 16 hours is then carried out in 200 DEG C of temperature, finally and in 80 DEG C of quenching-in waters
Obtain Mg-0.80Nd-0.80Ce-0.45Zn-0.40Zr cast rare earth magnesium alloy.
Implementation result: the Mg-0.80Nd-0.80Ce-0.45Zn-0.40Zr cast rare earth magnesium alloy T6 that the present embodiment obtains
The room-temperature mechanical property of state are as follows: tensile strength 234MPa, yield strength 130MPa, elongation percentage 11%.
Embodiment 2
The present embodiment is related to a kind of magnesium alloy containing cerium mischmetal, the component and its mass percent of the magnesium alloy are as follows:
1.20wt.%Nd, 1.20wt.%Ce, 0.65wt.%Zn, 0.40wt.%Zr, the total content of impurity element S i, Fe, Cu and Ni
Less than 0.20wt.%, surplus is that (wt.% refers to that component accounts for the percentage of prepared magnesium alloy gross mass to Mg, and gross mass is
The quality of Mg, Zn and various intermediate alloys and).
The present embodiment is related to the alloy heat treatment method in the casting method and the present invention of conventional rare magnesium alloy:
Wherein, founding process is in SF6And CO2It is carried out under the conditions of mixed gas protected, steps are as follows:
(1) baking material: pure magnesium, pure zinc, Mg-Nd/Mg-Ce/Mg-Zr intermediate alloy are preheated 3 hours at 200 DEG C or more；
(2) it melts magnesium: the pure magnesium after drying has been put into SF6/CO2It is melted in the crucible electrical resistance furnace of gas shield；
(3) add Zn and Nd/Ce: after magnesium liquid temperature reaches 720 DEG C, pure zinc and Mg-25wt.% are directly added into magnesium liquid
Nd/Mg-20wt.%Ce intermediate alloy, makes Zn element account for 0.65wt.% in the magnesium alloy gross mass of preparation, and Nd element accounts for
1.20wt.%, Ce element account for 1.20wt.%；
(4) after the fusing of Mg-Nd/Mg-Ce intermediate alloy, Mg-30wt.% is added when rising to 760~780 DEG C in melt temperature
Zr intermediate alloy is skimmed surface scum after the fusing of Mg-Zr intermediate alloy, is stirred 2~3 minutes.750~755 DEG C are cooled to, no
Power-off refining, is warming up to 780 DEG C of standings after refining, time of repose is 25~40 minutes.
(5) magnesium liquid skims surface scum and carries out metal gravity casting after standing after being cooled to 690~740 DEG C, obtains Mg-
1.20Nd-1.20Ce-0.65Zn-0.40Zr magnesium-rare earth.
Heat treatment procedure are as follows:
It is small that the Mg-1.20Nd-1.20Ce-0.65Zn-0.40Zr alloy pig that melting is obtained carries out 14 in 540 DEG C of temperature
When solution treatment single-stage aging processing in 8 hours is then carried out in 200 DEG C of temperature and in 80 DEG C of quenching-in waters, finally
To Mg-1.20Nd-1.20Ce-0.65Zn-0.4Zr cast rare earth magnesium alloy.
Implementation result: the Mg-1.20Nd-1.20Ce-0.65Zn-0.4Zr cast rare earth magnesium alloy T6 that the present embodiment obtains
The room-temperature mechanical property of state are as follows: tensile strength 245MPa, yield strength 140MPa, elongation percentage 7%.
Embodiment 3
The present embodiment is related to a kind of magnesium alloy containing cerium mischmetal, the component and its mass percent of the magnesium alloy are as follows:
The total content of 1.0wt.%Nd, 1.0wt.%Ce, 0.55wt.%Zn, 0.40wt.%Zr, impurity element S i, Fe, Cu and Ni are small
In 0.20wt.%, surplus be Mg (wt.% refers to that component accounts for the percentage of prepared magnesium alloy gross mass, gross mass Mg,
The quality of Zn and various intermediate alloys and).
The present embodiment is related to the alloy heat treatment method in the casting method and the present invention of conventional rare magnesium alloy:
Wherein, founding process is in SF6And CO2It is carried out under the conditions of mixed gas protected, steps are as follows:
(1) baking material: pure magnesium, pure zinc, Mg-Nd/Mg-Ce/Mg-Zr intermediate alloy are preheated 3 hours at 200 DEG C or more；
(2) it melts magnesium: the pure magnesium after drying has been put into SF6/CO2It is melted in the crucible electrical resistance furnace of gas shield；
(3) add Zn and Nd/Ce: after magnesium liquid temperature reaches 720 DEG C, pure zinc and Mg-25wt.% are directly added into magnesium liquid
Nd/Mg-20wt.%Ce intermediate alloy, makes Zn element account for 0.55wt.% in the magnesium alloy gross mass of preparation, and Nd element accounts for
1.0wt.%, Ce element account for 1.0wt.%；
(4) after the fusing of Mg-Nd/Mg-Ce intermediate alloy, Mg-30wt.% is added when rising to 760~780 DEG C in melt temperature
Zr intermediate alloy is skimmed surface scum after the fusing of Mg-Zr intermediate alloy, is stirred 2~3 minutes.750~755 DEG C are cooled to, no
Power-off refining, is warming up to 780 DEG C of standings after refining, time of repose is 25~40 minutes.
(5) magnesium liquid skims surface scum and carries out metal gravity casting after standing after being cooled to 690~740 DEG C, obtains Mg-
1.0Nd-1.0Ce-0.55Zn-0.40Zr magnesium-rare earth.
Heat treatment procedure are as follows:
The Mg-1.0Nd-1.0Ce-0.55Zn-0.40Zr alloy pig that melting is obtained carries out 8 hours in 540 DEG C of temperature
Solution treatment single-stage aging processing in 12 hours is then carried out in 200 DEG C of temperature and in 80 DEG C of quenching-in waters, finally
To Mg-1.0Nd-1.0Ce-0.55Zn-0.40Zr cast rare earth magnesium alloy.
Implementation result: the Mg-1.0Nd-1.0Ce-0.55Zn-0.40Zr cast rare earth magnesium alloy T6 state that the present embodiment obtains
Room-temperature mechanical property are as follows: tensile strength 237MPa, yield strength 136MPa, elongation percentage 9%.
Embodiment 4
The present embodiment is related to a kind of magnesium alloy containing cerium mischmetal, the component and its mass percent of the magnesium alloy are as follows:
The total content of 1.0wt.%Nd, 0.80wt.%Ce, 0.45wt.%Zn, 0.40wt.%Zr, impurity element S i, Fe, Cu and Ni are small
In 0.20wt.%, surplus be Mg (wt.% refers to that component accounts for the percentage of prepared magnesium alloy gross mass, gross mass Mg,
The quality of Zn and various intermediate alloys and).
The present embodiment is related to the alloy heat treatment method in the casting method and the present invention of conventional rare magnesium alloy:
Wherein, founding process is in SF6And CO2It is carried out under the conditions of mixed gas protected, steps are as follows:
(1) baking material: pure magnesium, pure zinc, Mg-Nd/Mg-Ce/Mg-Zr intermediate alloy are preheated 3 hours at 200 DEG C or more；
(2) it melts magnesium: the pure magnesium after drying has been put into SF6/CO2It is melted in the crucible electrical resistance furnace of gas shield；
(3) add Zn and Nd/Ce: after magnesium liquid temperature reaches 720 DEG C, pure zinc and Mg-25wt.% are directly added into magnesium liquid
Nd/Mg-20wt.%Ce intermediate alloy, makes Zn element account for 0.45wt.% in the magnesium alloy gross mass of preparation, and Nd element accounts for
1.0wt.%, Ce element account for 0.80wt.%；
(4) after the fusing of Mg-Nd/Mg-Ce intermediate alloy, Mg-30wt.% is added when rising to 760~780 DEG C in melt temperature
Zr intermediate alloy is skimmed surface scum after the fusing of Mg-Zr intermediate alloy, is stirred 2~3 minutes.750~755 DEG C are cooled to, no
Power-off refining, is warming up to 780 DEG C of standings after refining, time of repose is 25~40 minutes.
(5) magnesium liquid skims surface scum and carries out metal gravity casting after standing after being cooled to 690~740 DEG C, obtains Mg-
1.0Nd-0.80Ce-0.45Zn-0.40Zr magnesium-rare earth.
Heat treatment procedure are as follows:
The Mg-1.0Nd-0.80Ce-0.45Zn-0.40Zr alloy pig that melting is obtained carries out 8 hours in 540 DEG C of temperature
Solution treatment single-stage aging processing in 16 hours is then carried out in 200 DEG C of temperature and in 80 DEG C of quenching-in waters, finally
To Mg-1.0Nd-0.80Ce-0.45Zn-0.40Zr cast rare earth magnesium alloy.
Implementation result: the Mg-1.0Nd-0.80Ce-0.45Zn-0.40Zr cast rare earth magnesium alloy T6 that the present embodiment obtains
The room-temperature mechanical property of state are as follows: tensile strength 235MPa, yield strength 132MPa, elongation percentage 10%.
Fig. 1 is that Mg-Nd-Ce-Zn-Zr alloy of the invention is formed in magnesium matrix after being dissolved & ageing treatment (T6)
The second phase (b) of basal plane precipitated phase (a) and Dispersed precipitate in grain boundaries.As shown in Figure 1, basal plane precipitated phase is metastable with Mg-Nd-Zn
Based on phase, and the second phase of grain boundaries is then Mg12Ce balances phase, the precipitation hardened dispersion-strengtherning with the second phase of grain boundaries of basal plane
It is the main strengthening mechanism of Mg-Nd-Ce-Zn-Zr alloy.Both second phases of basal plane precipitated phase and grain boundaries disperse in the present invention
Common strengthening effect it is suitable with the strengthening effect of prismatic surface precipitated phase in Mg-3.0Nd-0.2Zn-Zr alloy, and need
Rare earth element total amount and cost are remarkably decreased.
Comparative example 1
The present embodiment is related to a kind of without cerium mischmetal magnesium alloy, the component and its mass percent of the magnesium alloy are as follows:
The total content of 1.0wt.%Nd, 0.45wt.%Zn, 0.40wt.%Zr, impurity element S i, Fe, Cu and Ni are less than 0.20wt.%,
Surplus is that (wt.% refers to that component accounts for the percentage of prepared magnesium alloy gross mass, gross mass Mg, Zn and various centres to Mg
The quality of alloy and).
The present embodiment is related to the casting method and heat treatment method of conventional rare magnesium alloy:
Wherein, founding process is in SF6And CO2It is carried out under the conditions of mixed gas protected, steps are as follows:
(1) baking material: pure magnesium, pure zinc, Mg-Nd/Mg-Zr intermediate alloy are preheated 3 hours at 200 DEG C or more；
(2) it melts magnesium: the pure magnesium after drying has been put into SF6/CO2It is melted in the crucible electrical resistance furnace of gas shield；
(3) add Zn and Nd: after magnesium liquid temperature reaches 720 DEG C, pure zinc and Mg-25wt.%Nd are directly added into magnesium liquid
Intermediate alloy, makes Zn element account for 0.45wt.% in the magnesium alloy gross mass of preparation, and Nd element accounts for 1.0wt.%；
(4) after the fusing of Mg-Nd intermediate alloy, melt temperature is added among Mg-30wt.%Zr when rising to 760~780 DEG C
Alloy is skimmed surface scum after the fusing of Mg-Zr intermediate alloy, is stirred 2~3 minutes.750~755 DEG C are cooled to, essence is not powered off
Refining, is warming up to 780 DEG C of standings after refining, time of repose is 25~40 minutes.
(5) magnesium liquid skims surface scum and carries out metal gravity casting after standing after being cooled to 690~740 DEG C, obtains Mg-
1.0Nd-0.45Zn-0.40Zr magnesium-rare earth.
Heat treatment procedure are as follows:
The Mg-1.0Nd-0.45Zn-0.40Zr alloy pig that melting is obtained carries out solid solution in 8 hours in 540 DEG C of temperature
Processing, and in 80 DEG C of quenching-in waters, single-stage aging processing in 16 hours is then carried out in 200 DEG C of temperature, finally obtains Mg-
1.0Nd-0.45Zn-0.40Zr cast rare earth magnesium alloy.
Implementation result: the room temperature for the Mg-1.0Nd-0.45Zn-0.40Zr cast rare earth magnesium alloy T6 state that this comparative example obtains
Mechanical property are as follows: tensile strength 242MPa, yield strength 112MPa, elongation percentage 13%.With automotive hub material requirements
(210MPa-130MPa-7%) comparison is it is found that the yield strength of the Mg-1.0Nd-0.45Zn-0.40Zr without Ce is significantly lower than
130MPa can not meet the requirement of automotive hub, can not be used for the manufacture of automotive hub.
Comparative example 2
The present embodiment is related to a kind of magnesium-rare earth containing gadolinium, the component and its mass percent of the magnesium alloy are as follows:
The total content of 1.0wt.%Nd, 0.8wt.%Gd, 0.45wt.%Zn, 0.40wt.%Zr, impurity element S i, Fe, Cu and Ni are small
In 0.20wt.%, surplus be Mg (wt.% refers to that component accounts for the percentage of prepared magnesium alloy gross mass, gross mass Mg,
The quality of Zn and various intermediate alloys and).
The present embodiment is related to the alloy heat treatment method in the casting method and the present invention of conventional rare magnesium alloy:
Wherein, founding process is in SF6And CO2It is carried out under the conditions of mixed gas protected, steps are as follows:
(1) baking material: pure magnesium, pure zinc, Mg-Nd/Mg-Gd/Mg-Zr intermediate alloy are preheated 3 hours at 200 DEG C or more；
(2) it melts magnesium: the pure magnesium after drying has been put into SF6/CO2It is melted in the crucible electrical resistance furnace of gas shield；
(3) add Zn and Nd/Gd: after magnesium liquid temperature reaches 720 DEG C, pure zinc and Mg-25wt.% are directly added into magnesium liquid
Nd/Mg-30wt.%Gd intermediate alloy, makes Zn element account for 0.45wt.% in the magnesium alloy gross mass of preparation, and Nd element accounts for
1.0wt.%, Gd element account for 0.8wt.%；
(4) after the fusing of Mg-Nd/Mg-Gd intermediate alloy, Mg-30wt.% is added when rising to 760~780 DEG C in melt temperature
Zr intermediate alloy is skimmed surface scum after the fusing of Mg-Zr intermediate alloy, is stirred 2~3 minutes.750~755 DEG C are cooled to, no
Power-off refining, is warming up to 780 DEG C of standings after refining, time of repose is 25~40 minutes.
(5) magnesium liquid skims surface scum and carries out metal gravity casting after standing after being cooled to 690~740 DEG C, obtains Mg-
1.0Nd-0.8Gd-0.45Zn-0.40Zr magnesium-rare earth.
Heat treatment procedure are as follows:
The Mg-1.0Nd-0.8Gd-0.45Zn-0.40Zr alloy pig that melting is obtained carries out 8 hours in 540 DEG C of temperature
Solution treatment single-stage aging processing in 16 hours is then carried out in 200 DEG C of temperature and in 80 DEG C of quenching-in waters, finally
To Mg-1.0Nd-0.8Gd-0.45Zn-0.40Zr cast rare earth magnesium alloy.
Implementation result: the Mg-1.0Nd-0.8Gd-0.45Zn-0.40Zr cast rare earth magnesium alloy T6 state that the present embodiment obtains
Room-temperature mechanical property are as follows: tensile strength 252MPa, yield strength 118MPa, elongation percentage 15%.With automotive hub material requirements
(210MPa-130MPa-7%) is compared it is found that the yield strength of the Mg-1.0Nd-0.8Gd-0.45Zn-0.40Zr containing Gd is also bright
It is aobvious to be lower than 130MPa, it can not meet the requirement of automotive hub, the manufacture of automotive hub can not be used for.
Specific embodiments of the present invention are described above.Comparative example illustrates that Ce element is strong to alloy surrender is improved
The effect of degree.It is to be appreciated that the present invention is not limited to the above specific embodiments, those skilled in the art can weighed
Benefit makes various deformations or amendments in the range of requiring, this is not affected the essence of the present invention.
Claims (4)
1. a kind of magnesium alloy containing cerium mischmetal, which is characterized in that the magnesium alloy containing cerium mischmetal includes following weight percent content
Each component: 0.80~1.20%Nd, 0.80~1.20%Ce, 0.45~0.65%Zn, 0.30~0.70%Zr, impurity element
Total amount is less than 0.20wt%, surplus Mg.
2. magnesium alloy containing cerium mischmetal as described in claim 1, which is characterized in that the impurity element includes Si, Fe, Cu, Ni
At least one of, and the content of Si element is no more than content of the content no more than 0.01%, Cu element of 0.01%, Fe element
Content no more than 0.03%, Ni element is no more than 0.005%.
3. a kind of heat treatment method of the magnesium alloy containing cerium mischmetal as described in claim 1, which is characterized in that the method includes
Following steps:
After the alloy pig of the magnesium alloy containing cerium mischmetal or casting are carried out 6~14h of solution treatment at 535~545 DEG C, water
Middle quenching；
Single-stage aging is carried out at 195~205 DEG C and handles 6~16h, obtains the magnesium alloy containing cerium mischmetal.
4. the heat treatment method of the magnesium alloy containing cerium mischmetal as claimed in claim 3, which is characterized in that the temperature of the quenching is
25~80 DEG C.
Priority Applications (1)
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU585940A1 (en) * | 1974-02-05 | 1977-12-30 | Пермский Моторостроительный Завод Им.Я.М.Свердлова | Welding wire composition |
| CN1675395A (en) * | 2002-06-21 | 2005-09-28 | 铸造中心有限公司 | Creep resistant magnesium alloy |
| WO2009039581A1 (en) * | 2007-09-28 | 2009-04-02 | Cast Crc Limited | Permanent mould cast magnesium alloy |
| CN101787472A (en) * | 2010-03-18 | 2010-07-28 | 上海交通大学 | Heat-resistant forged magnesium-rare earth alloy and preparation method thereof |
| CN102994847A (en) * | 2011-09-09 | 2013-03-27 | 江汉大学 | Heatproof magnesium alloy |
| DE102012108089A1 (en) * | 2012-08-31 | 2014-05-15 | Gottfried Wilhelm Leibniz Universität Hannover | Magnesium alloy used for formation of work samples used as medical device e.g. implant and suture, comprises magnesium and zinc, and rare-earth metal in specified weight ratio |
| CN106435316A (en) * | 2016-11-01 | 2017-02-22 | 上海航天精密机械研究所 | Flame-resistant Mg-Nd magnesium alloy and casting method for sand casting thereof |
| CN107201472A (en) * | 2017-03-30 | 2017-09-26 | 上海交通大学 | Sand casting magnesium-rare earth and preparation method thereof |
-
2018
- 2018-11-23 CN CN201811407881.3A patent/CN109295369A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU585940A1 (en) * | 1974-02-05 | 1977-12-30 | Пермский Моторостроительный Завод Им.Я.М.Свердлова | Welding wire composition |
| CN1675395A (en) * | 2002-06-21 | 2005-09-28 | 铸造中心有限公司 | Creep resistant magnesium alloy |
| WO2009039581A1 (en) * | 2007-09-28 | 2009-04-02 | Cast Crc Limited | Permanent mould cast magnesium alloy |
| CN101787472A (en) * | 2010-03-18 | 2010-07-28 | 上海交通大学 | Heat-resistant forged magnesium-rare earth alloy and preparation method thereof |
| CN102994847A (en) * | 2011-09-09 | 2013-03-27 | 江汉大学 | Heatproof magnesium alloy |
| DE102012108089A1 (en) * | 2012-08-31 | 2014-05-15 | Gottfried Wilhelm Leibniz Universität Hannover | Magnesium alloy used for formation of work samples used as medical device e.g. implant and suture, comprises magnesium and zinc, and rare-earth metal in specified weight ratio |
| CN106435316A (en) * | 2016-11-01 | 2017-02-22 | 上海航天精密机械研究所 | Flame-resistant Mg-Nd magnesium alloy and casting method for sand casting thereof |
| CN107201472A (en) * | 2017-03-30 | 2017-09-26 | 上海交通大学 | Sand casting magnesium-rare earth and preparation method thereof |
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