CN108570587A - A kind of heat-proof corrosion-resistant magnesium alloy and preparation method thereof - Google Patents
A kind of heat-proof corrosion-resistant magnesium alloy and preparation method thereof Download PDFInfo
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- CN108570587A CN108570587A CN201711330817.5A CN201711330817A CN108570587A CN 108570587 A CN108570587 A CN 108570587A CN 201711330817 A CN201711330817 A CN 201711330817A CN 108570587 A CN108570587 A CN 108570587A
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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
- C22C23/04—Alloys based on magnesium with zinc or cadmium 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
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
- C22C1/03—Making non-ferrous alloys by melting using master alloys
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/06—Making non-ferrous alloys with the use of special agents for refining or deoxidising
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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
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Abstract
The invention discloses a kind of heat-proof corrosion-resistant magnesium alloys, include the component of following weight percentage：0.5~2.0wt% of Zn 5.0~6.0wt%, Zr 0.3~0.9wt%, Nd, 1.5~3wt% of Y 1.0~2.5wt%, V 0.5~1.0wt%, Cd, surplus is Mg and inevitable impurity, and the mass percentage of inevitable impurity is no more than 0.03wt%.The present invention adds Nd, Y, V and Cd on the basis of ZK60, and obviously refinement makes the mechanical behavior under high temperature of magnesium alloy and corrosion resistance greatly improve, expanded it and required under high fever use environment, further expanded the use scope of ZK60 crystal grain with uniformly.
Description
Technical field
Belong to technical field of alloy, is related to a kind of heat-resistant antifriction magnesium alloy and preparation method thereof.
Background technology
For magnesium alloy since density is small, specific strength and specific stiffness are high, and dimensional stability and thermal conductivity are high, and good mechanical property is
A kind of very attractive commercial lightweight structural material.In addition, magnesium is one of the element that reserves are most abundant on the earth, it is
A small number of inexhaustible, nexhaustible metals resources, and be easily recycled.Therefore, it largely uses used for magnesium alloy in automobile and aviation
The important directions of future development of manufacturing, can not only reach maximum weight loss effect, and can alleviate increasingly when field works
Serious energy problem.
Magnesium alloy member on automobile at present is all substantially die casting, is mainly used for some housing components and loaded relatively light
Panel and holder.Magnesium alloy in auto industry largely using just having to realize that magnesium alloy parts non-hold by current
Power part is crossed over to secondary bearing member or bearing member, therefore to the performance requirement higher of magnesium alloy, and pass through the works such as forging, extruding or rolling
Usually there is the wrought magnesium alloy product that skill is produced higher intensity and fatigue life, better ductility to have casting magnesium
The excellent performance that alloy product can not replace.Now, the development of magnesium alloy mainly endeavours development and application in high-strength, high-ductility, corrosion resistant
Lose and have the wrought magnesium alloy of excellent formability energy.
In wrought magnesium alloy, magnesium-zinc-zirconium alloy (Mg-Zn-Zr) is as intensity highest one in existing commercial magnesium alloy
Kind, there is good plasticity and corrosion resistance, and be one of wrought magnesium alloy most widely used at present.Largely closed using ZK60 magnesium
Gold is the following aerospace and the development trend of automobile manufacturing field.But ZK60 temperature-room type plasticities are poor, especially poor heat resistance, hot tearing
Tendency is big, and Magnesium Alloys Components need to bear the adverse circumstances such as high temperature, burn into alternating load during being on active service, long and long
It, Magnesium Alloys Components will germinate fatigue crack source on surface, and fatigue crack source continues to extend further to crackle, part
Fatigue rupture failure will occur；Therefore the use for being difficult to meet the use under high temperature resistant environment, especially aerospace field is wanted
It asks, prodigious limitation is caused to the development of magnesium alloy.
Invention content
The technical problem to be solved by the present invention is to overcome the deficiencies in the prior art, provide a kind of refining alloy crystal grain, have
Higher heat-resisting and corrosion resisting property magnesium alloy and preparation method thereof.
In order to solve the above technical problems, the present invention uses following technical scheme：
A kind of heat-proof corrosion-resistant magnesium alloy, includes the component of following weight percentage：Zn 5.0~6.0wt%, Zr 0.3
~0.9wt%, Nd 0.5~2.0wt%, Y 1.0~2.5wt%, V 1.5~3wt% of 0.5~1.0wt%, Cd, surplus are
The mass percentage of Mg and inevitable impurity, inevitable impurity is no more than 0.03wt%.
Preferably, inevitable impurity includes Fe and Si.
Preferably, include the component of following weight percentage：Zn 5.2~5.8wt%, Zr 0.4~0.8wt%, Nd
0.8~1.8wt%, Y 1.2~2.2wt%, V 0.6~0.9wt%, Cd 1.6~2.8%, surplus Mg, and it is inevitable
Impurity, the mass percentage of inevitable impurity is no more than 0.03wt%.
Preferably, include the component of following weight percentage：Zn 5.3~5.7wt%, Zr 0.5~0.7wt%, Nd
1.0~1.5wt%, Y 1.5~2.0wt%, V 0.6~0.8wt%, Cd 2~2.5%, surplus Mg, and inevitably
The mass percentage of impurity, inevitable impurity is no more than 0.03wt%.
Preferably, include the component of following weight percentage：Zn 5.5wt%, Zr 0.6wt%, Nd 1.2wt%, Y
1.8wt%, V 0.7wt%, Cd 2.3%, surplus Mg and inevitable impurity, the quality percentage of inevitable impurity
Content is no more than 0.03wt%.
The inventive concept total as one, the present invention also provides a kind of preparation method of above-mentioned heat-proof corrosion-resistant magnesium alloy,
Include the following steps：
(1) press heat-resistant antifriction magnesium alloy proportioning by pure magnesium ingot, pure zinc ingot, Mg-Nd intermediate alloys, Mg-Y intermediate alloys,
Mg-V intermediate alloys and Mg-Cd intermediate alloys are preheated to 400 DEG C in an oven, keep the temperature 10~20min；In SF6+CO2Gas is protected
Under shield, pure magnesium ingot, pure zinc ingot are put into crucible, the temperature-gradient method at a temperature of 350~550 DEG C, 550~750 DEG C, heating is molten
Refining；850~900 DEG C are warming up to, then is added in the Mg-Nd intermediate alloys, Mg-Y intermediate alloys, Mg-V of preheating into magnesium zinc melt
Between alloy and Mg-Cd intermediate alloys, every 20 minutes stir 1 time, stir 3~4 times, keep ingredient uniform；
(2) smelting agent is added and removes impurity；It is cooled to 750~760 DEG C and stands 30~40 minutes, after standing, salvage
Dross on surface of fusant；It is warming up to 790~800 DEG C again and stands 30~40 minutes, after standing, salvages dross on surface of fusant；
(3) when temperature drops to 650~700 DEG C, in SF6+CO2Under gas shield, in 200~300 DEG C of swage into
Row casting；Air-cooled, demoulding；
(4) ingot casting is machined out, ingot diameters are 100mm after turning；
(5) magnesium alloy ingot after machining is subjected to solution heat treatment；
(6) magnesium alloy ingot after aging strengthening model is subjected to hot extrusion, obtains the magnesium alloy rod of a diameter of 18mm.
Preferably, in the step (4), solution heat treatment temperature be 350~400 DEG C, the time be 18~for 24 hours.
Preferably, in the step (6), the technique of the hot extrusion is：Ingot casting preheating and extrusion cylinder temperature are equal before squeezing
It is 380 DEG C, preheats 2 hours, it is 400 DEG C to squeeze temperature, and extrusion ratio is 20~40: 1, and extrusion speed is 0.6~1.0mm/s.
Preferably, Mg-Nd intermediate alloys are Mg-24wt%Nd intermediate alloys, and Mg-Y intermediate alloys are in Mg-30wt%Y
Between alloy, Mg-Cd intermediate alloys be Mg-30wt%Cd intermediate alloys, Mg-V intermediate alloys are Mg-25wt%V intermediate alloys.
Compared with the prior art, the advantages of the present invention are as follows：
The present invention adds Nd, Y, V and Cd on the basis of ZK60, these four elements can generate the very high binary of fusing point with Mg
Compound improves mechanical behavior under high temperature, after fixation rates, partization in the presence of can play the role of pinning crystal boundary on crystal boundary
Dislocation motion when object is solid-solution in matrix and is precipitated in small and dispersed shape in timeliness, base plastic is hindered to deform is closed, is enhanced
Matrix is to improve the mechanical behavior under high temperature of alloy.In addition, the addition of V and Cd adds in fusion process using segmentation melting
Technique can improve Corrosion Behaviors of Magnesium Alloys current potential, reduce corrosion electric current density, hence it is evident that reduce the corrosion rate of magnesium alloy, improve alloy
Corrosion resisting property.After experimental data shows ZK60 additions Nd, Y, V and Cd provided by the invention, obviously refinement makes crystal grain with uniformly
The mechanical behavior under high temperature of magnesium alloy greatly improves, and has expanded it and has been required under high fever use environment, has further expanded ZK60's
Use scope.
Specific implementation mode
Below in conjunction with specific preferred embodiment, the invention will be further described, but not thereby limiting the invention
Protection domain.
Embodiment 1：
A kind of heat-proof corrosion-resistant magnesium alloy, includes the component of following weight percentage：Zn 5.5wt%, Zr 0.6wt%,
Nd 1.2wt%, Y 1.8wt%, V 0.7wt%, Cd 2.3%, surplus Mg and inevitable impurity, inevitably
The mass percentage of impurity is no more than 0.03wt%.
Specific preparation method is as follows：
(1) proportioning of heat-resistant antifriction magnesium alloy is pressed by pure magnesium ingot, pure zinc ingot, Mg-24wt%Nd intermediate alloys, Mg-
30wt%Y intermediate alloys, Mg-30wt%Cd intermediate alloys and Mg-25wt%V intermediate alloys are preheated to 400 DEG C in an oven, protect
Warm 15min；In SF6+CO2Under gas shield, pure magnesium ingot, pure zinc ingot are put into crucible, are segmented at a temperature of 400 DEG C, 650 DEG C
Melting is heated in heating；Be warming up to 850 DEG C, then be added into magnesium zinc melt the Mg-Nd intermediate alloys of preheating, Mg-Y intermediate alloys,
Mg-V intermediate alloys and Mg-Cd intermediate alloys stirred 1 time every 20 minutes, stirred 4 times, kept ingredient uniform；
(2) smelting agent is added and removes impurity；It is cooled to 750 DEG C and stands 40 minutes, after standing, it is floating to salvage bath surface
Slag；It is warming up to 800 DEG C again and stands 40 minutes, after standing, salvages dross on surface of fusant；
(3) when temperature drops to 680 DEG C, in SF6+CO2Under gas shield, cast in 300 DEG C of swage；It is empty
Cold, demoulding；
(4) ingot casting is machined out, ingot diameters are 100mm after turning；
(5) magnesium alloy ingot after machining is carried out to solution heat treatment 20h at 400 DEG C；
(6) magnesium alloy ingot after aging strengthening model is subjected to hot extrusion, the technique of hot extrusion is：Ingot casting preheating before squeezing
It is 380 DEG C with extrusion cylinder temperature, preheats 2 hours, it is 400 DEG C to squeeze temperature, extrusion ratio 25: 1, extrusion speed 0.8mm/
S obtains the magnesium alloy rod of a diameter of 18mm.
Embodiment 2：
A kind of heat-proof corrosion-resistant magnesium alloy, includes the component of following weight percentage：Zn 5.3wt%, Zr 0.7wt%,
Nd 1.0wt%, Y 1.5wt%, V 0.8wt%, Cd 2%, surplus Mg and inevitable impurity, it is inevitably miscellaneous
The mass percentage of matter is no more than 0.03wt%.
Specific preparation method is as follows：
(1) proportioning of heat-resistant antifriction magnesium alloy is pressed by pure magnesium ingot, pure zinc ingot, Mg-24wt%Nd intermediate alloys, Mg-
30wt%Y intermediate alloys, Mg-30wt%Cd intermediate alloys and Mg-25wt%V intermediate alloys are preheated to 400 DEG C in an oven, protect
Warm 15min；In SF6+CO2Under gas shield, pure magnesium ingot, pure zinc ingot are put into crucible, are segmented at a temperature of 500 DEG C, 700 DEG C
Melting is heated in heating；Be warming up to 880 DEG C, then be added into magnesium zinc melt the Mg-Nd intermediate alloys of preheating, Mg-Y intermediate alloys,
Mg-V intermediate alloys and Mg-Cd intermediate alloys stirred 1 time every 20 minutes, stirred 4 times, kept ingredient uniform；
(2) smelting agent is added and removes impurity；It is cooled to 760 DEG C and stands 40 minutes, after standing, it is floating to salvage bath surface
Slag；It is warming up to 800 DEG C again and stands 40 minutes, after standing, salvages dross on surface of fusant；
(3) when temperature drops to 700 DEG C, in SF6+CO2Under gas shield, cast in 300 DEG C of swage；It is empty
Cold, demoulding；
(4) ingot casting is machined out, ingot diameters are 100mm after turning；
(5) magnesium alloy ingot after machining is subjected to solution heat treatment for 24 hours at 350 DEG C；
(6) magnesium alloy ingot after aging strengthening model is subjected to hot extrusion, the technique of hot extrusion is：Ingot casting preheating before squeezing
It is 380 DEG C with extrusion cylinder temperature, preheats 2 hours, it is 400 DEG C to squeeze temperature, extrusion ratio 40: 1, extrusion speed 1.0mm/
S obtains the magnesium alloy rod of a diameter of 18mm.
Embodiment 3：
A kind of heat-proof corrosion-resistant magnesium alloy, includes the component of following weight percentage：Zn：5.7wt%, Zr 0.5wt%,
Nd1.5wt%, Y 2.0wt%, V 0.6wt%, Cd 2.5%, surplus Mg and inevitable impurity, it is inevitably miscellaneous
The mass percentage of matter is no more than 0.03wt%.
Specific preparation method is as follows：
(1) proportioning of heat-resistant antifriction magnesium alloy is pressed by pure magnesium ingot, pure zinc ingot, Mg-24wt%Nd intermediate alloys, Mg-
30wt%Y intermediate alloys, Mg-30wt%Cd intermediate alloys and Mg-25wt%V intermediate alloys are preheated to 400 DEG C in an oven, protect
Warm 20min；In SF6+CO2Under gas shield, pure magnesium ingot, pure zinc ingot are put into crucible, are segmented at a temperature of 450 DEG C, 650 DEG C
Melting is heated in heating；Be warming up to 850 DEG C, then be added into magnesium zinc melt the Mg-Nd intermediate alloys of preheating, Mg-Y intermediate alloys,
Mg-V intermediate alloys and Mg-Cd intermediate alloys stirred 1 time every 20 minutes, stirred 4 times, kept ingredient uniform；
(2) smelting agent is added and removes impurity；It is cooled to 760 DEG C and stands 40 minutes, after standing, it is floating to salvage bath surface
Slag；It is warming up to 790 DEG C again and stands 40 minutes, after standing, salvages dross on surface of fusant；
(3) when temperature drops to 680 DEG C, in SF6+CO2Under gas shield, cast in 260 DEG C of swage；It is empty
Cold, demoulding；
(4) ingot casting is machined out, ingot diameters are 100mm after turning；
(5) magnesium alloy ingot after machining is carried out to solution heat treatment 22h at 380 DEG C；
(6) magnesium alloy ingot after aging strengthening model is subjected to hot extrusion, the technique of hot extrusion is：Ingot casting preheating before squeezing
It is 380 DEG C with extrusion cylinder temperature, preheats 2 hours, it is 400 DEG C to squeeze temperature, extrusion ratio 28: 1, extrusion speed 0.7mm/
S obtains the magnesium alloy rod of a diameter of 18mm.
Embodiment 4：
A kind of heat-proof corrosion-resistant magnesium alloy, includes the component of following weight percentage：Zn：5.2wt%, Zr 0.8wt%,
Nd0.8wt%, Y 1.2wt%, V 0.9wt%, Cd 1.6wt%, surplus Mg and inevitable impurity, inevitably
The mass percentage of impurity is no more than 0.03wt%.
Specific preparation method is as follows：
(1) proportioning of heat-resistant antifriction magnesium alloy is pressed by pure magnesium ingot, pure zinc ingot, Mg-24wt%Nd intermediate alloys, Mg-
30wt%Y intermediate alloys, Mg-30wt%Cd intermediate alloys and Mg-25wt%V intermediate alloys are preheated to 400 DEG C in an oven, protect
Warm 20min；In SF6+CO2Under gas shield, pure magnesium ingot, pure zinc ingot are put into crucible, are segmented at a temperature of 550 DEG C, 750 DEG C
Melting is heated in heating；Be warming up to 900 DEG C, then be added into magnesium zinc melt the Mg-Nd intermediate alloys of preheating, Mg-Y intermediate alloys,
Mg-V intermediate alloys and Mg-Cd intermediate alloys stirred 1 time every 20 minutes, stirred 4 times, kept ingredient uniform；
(2) smelting agent is added and removes impurity；It is cooled to 755 DEG C and stands 40 minutes, after standing, it is floating to salvage bath surface
Slag；It is warming up to 795 DEG C again and stands 40 minutes, after standing, salvages dross on surface of fusant；
(3) when temperature drops to 690 DEG C, in SF6+CO2Under gas shield, cast in 280 DEG C of swage；It is empty
Cold, demoulding；
(4) ingot casting is machined out, ingot diameters are 100mm after turning；
(5) magnesium alloy ingot after machining is carried out to solution heat treatment 22h at 370 DEG C；
(6) magnesium alloy ingot after aging strengthening model is subjected to hot extrusion, the technique of hot extrusion is：Ingot casting preheating before squeezing
It is 380 DEG C with extrusion cylinder temperature, preheats 2 hours, it is 400 DEG C to squeeze temperature, extrusion ratio 30: 1, extrusion speed 0.7mm/
S obtains the magnesium alloy rod of a diameter of 18mm.
Embodiment 5：
A kind of heat-proof corrosion-resistant magnesium alloy, includes the component of following weight percentage：Zn：5.8wt%, Zr 0.4wt%,
Nd1.8wt%, Y 2.2wt%, V 0.6wt%, Cd 2.8%, surplus Mg and inevitable impurity, it is inevitably miscellaneous
The mass percentage of matter is no more than 0.03wt%.
Specific preparation method is as follows：
(1) proportioning of heat-resistant antifriction magnesium alloy is pressed by pure magnesium ingot, pure zinc ingot, Mg-24wt%Nd intermediate alloys, Mg-
30wt%Y intermediate alloys, Mg-30wt%Y intermediate alloys, Mg-30wt%Cd intermediate alloys and Mg-25wt%V intermediate alloys exist
It is preheated to 400 DEG C in baking oven, keeps the temperature 20min；In SF6+CO2Under gas shield, pure magnesium ingot, pure zinc ingot are put into crucible,
Melting is heated in temperature-gradient method at a temperature of 500 DEG C, 700 DEG C；900 DEG C are warming up to, then the Mg-Nd of preheating is added into magnesium zinc melt
Intermediate alloy, Mg-Y intermediate alloys, Mg-V intermediate alloys and Mg-Cd intermediate alloys stirred 1 time every 20 minutes, stirred 4 times,
Keep ingredient uniform；
(2) smelting agent is added and removes impurity；It is cooled to 760 DEG C and stands 40 minutes, after standing, it is floating to salvage bath surface
Slag；It is warming up to 790 DEG C again and stands 40 minutes, after standing, salvages dross on surface of fusant；
(3) when temperature drops to 680 DEG C, in SF6+CO2Under gas shield, cast in 300 DEG C of swage；It is empty
Cold, demoulding；
(4) ingot casting is machined out, ingot diameters are 100mm after turning；
(5) magnesium alloy ingot after machining is subjected to solution heat treatment for 24 hours at 400 DEG C；
(6) magnesium alloy ingot after aging strengthening model is subjected to hot extrusion, the technique of hot extrusion is：Ingot casting preheating before squeezing
It is 380 DEG C with extrusion cylinder temperature, preheats 2 hours, it is 400 DEG C to squeeze temperature, extrusion ratio 35: 1, extrusion speed 0.9mm/
S obtains the magnesium alloy rod of a diameter of 18mm.
Performance detection is carried out for the magnesium alloy of ZK60 to magnesium alloy obtained by above-described embodiment and the trade mark respectively, wherein stretching strong
Spend the method for experiment：Sample after fixation rates, according to national standards GB6397-86《Metal stretching experimental sample》Add
Work is at 5 times of standard tensile specimens：Tension test, rate of extension are carried out on Japanese Shimadzu AG-I250kN precision universal testing machines
For 1mm/min：When drawing by high temperature, 10 minutes are kept the temperature, then stretched.
Corrosion test and analysis method are as follows：By polishing, polishing and with acetone and washes of absolute alcohol and the sheet of drying
After assay balance used for magnesium alloy is weighed, immersing in corrosive medium and taken out after 3 days, experiment corrosive medium uses 3.5%NaCl solution,
PH value is 7~7.5.
Again in the chromic acid (200mgCrO of boiling3/L+10mgAgNO3) in remove corrosion product, then use acetone and anhydrous again
Ethyl alcohol is cleaned and is weighed with assay balance after dry.Calculate corrosion rate：
V=(W0-W1)×t/A
In formula, V is the corrosion rate of sample, W0Quality before corroding for sample, W1To remove corrosion product after corrosion
The quality of sample afterwards, A are the area of sample, and t is the time of corrosion.
It is above-mentioned statistics indicate that, the tensile strength of magnesium alloy provided by the invention at a room temperature and a high temperature is better than ZK60, especially
It is at high temperature, hence it is evident that is better than ZK60.Also, corrosive nature is obviously improved；Greatly improve the heat-proof corrosion-resistant of ZK60.
The above is only the preferred embodiment of the application, not does any type of limitation to the application, although this Shen
Please disclosed as above with preferred embodiment, however not to limit the application, any person skilled in the art is not taking off
In the range of technical scheme, makes a little variation using the technology contents of the disclosure above or modification is equal to
Case study on implementation is imitated, is belonged in technical proposal scope.
Claims (9)
1. a kind of heat-proof corrosion-resistant magnesium alloy, which is characterized in that include the component of following weight percentage：Zn 5.0~
6.0wt%, Zr 0.3~0.9wt%, Nd 0.5~2.0wt%, Y 1.0~2.5wt%, V 0.5~1.0wt%, Cd 1.5
The mass percentage of~3wt%, surplus Mg and inevitable impurity, inevitable impurity is no more than 0.03wt%.
2. heat-proof corrosion-resistant magnesium alloy according to claim 1, which is characterized in that inevitable impurity includes Fe and Si.
3. heat-proof corrosion-resistant magnesium alloy according to claim 1 or 2, which is characterized in that including following weight percentage
Component：Zn 5.2~5.8wt%, Zr 0.4~0.8wt%, Nd 0.8~1.8wt%, Y 1.2~2.2wt%, V 0.6~
0.9wt%, Cd 1.6~2.8%, surplus Mg and inevitable impurity, the mass percentage of inevitable impurity
No more than 0.03wt%.
4. heat-proof corrosion-resistant magnesium alloy according to claim 3, which is characterized in that include the group of following weight percentage
Point：Zn 5.3~5.7wt%, Zr 0.5~0.7wt%, Nd 1.0~1.5wt%, Y 1.5~2.0wt%, V 0.6~
0.8wt%, Cd 2~2.5%, surplus Mg and inevitable impurity, the mass percentage of inevitable impurity is not
More than 0.03wt%.
5. heat-proof corrosion-resistant magnesium alloy according to claim 4, which is characterized in that include the group of following weight percentage
Point：Zn 5.5wt%, Zr 0.6wt%, Nd 1.2wt%, Y 1.8wt%, V 0.7wt%, Cd 2.3%, surplus Mg, and
The mass percentage of inevitable impurity, inevitable impurity is no more than 0.03wt%.
6. a kind of preparation method of such as Claims 1 to 5 any one of them heat-proof corrosion-resistant magnesium alloy, includes the following steps：
(1) proportioning of heat-resistant antifriction magnesium alloy is pressed by pure magnesium ingot, pure zinc ingot, Mg-Nd intermediate alloys, Mg-Y intermediate alloys, Mg-V
Intermediate alloy and Mg-Cd intermediate alloys are preheated to 400 DEG C in an oven, keep the temperature 10~20min；In SF6+CO2Under gas shield,
Pure magnesium ingot, pure zinc ingot are put into crucible, the temperature-gradient method at a temperature of 350~550 DEG C, 550~750 DEG C, heat melting；Heating
To 850~900 DEG C, then the Mg-Nd intermediate alloys, Mg-Y intermediate alloys, Mg-V intermediate alloys of preheating is added into magnesium zinc melt
It with Mg-Cd intermediate alloys, was stirred 1 time every 20 minutes, stirs 3~4 times, keep ingredient uniform；
(2) smelting agent is added and removes impurity；It is cooled to 750~760 DEG C and stands 30~40 minutes, after standing, salvage melt
Surface scum；It is warming up to 790~800 DEG C again and stands 30~40 minutes, after standing, salvages dross on surface of fusant；
(3) when temperature drops to 650~700 DEG C, in SF6+CO2Under gas shield, poured in 200~300 DEG C of swage
Casting；Air-cooled, demoulding；
(4) ingot casting is machined out, ingot diameters are 100mm after turning；
(5) magnesium alloy ingot after machining is subjected to solution heat treatment；
(6) magnesium alloy ingot after aging strengthening model is subjected to hot extrusion, obtains the magnesium alloy rod of a diameter of 18mm.
7. the preparation method of heat-proof corrosion-resistant magnesium alloy according to claim 6, which is characterized in that in the step (4), Gu
Molten heat treatment temperature be 350~400 DEG C, the time be 18~for 24 hours.
8. the preparation method of heat-proof corrosion-resistant magnesium alloy according to claim 7, which is characterized in that in the step (6), institute
The technique for stating hot extrusion is：Ingot casting preheating and extrusion cylinder temperature are 380 DEG C before squeezing, and are preheated 2 hours, and it is 400 to squeeze temperature
DEG C, extrusion ratio is 20~40: 1, and extrusion speed is 0.6~1.0mm/s.
9. according to the preparation method of claim 6~8 any one of them heat-proof corrosion-resistant magnesium alloy, which is characterized in that in Mg-Nd
Between alloy be Mg-24wt%Nd intermediate alloys, Mg-Y intermediate alloys are Mg-30wt%Y intermediate alloys, Mg-Cd intermediate alloys are
Mg-30wt%Cd intermediate alloys, Mg-V intermediate alloys are Mg-25wt%V intermediate alloys.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110724843A (en) * | 2019-11-20 | 2020-01-24 | 重庆大学 | Method for removing magnesium oxide inclusion in magnesium or magnesium alloy melt |
| CN111455247A (en) * | 2020-04-13 | 2020-07-28 | 西安建筑科技大学 | Mg-Zn series heat-strength magnesium alloy added with calcium and strontium elements and preparation method thereof |
| CN113234977A (en) * | 2021-05-10 | 2021-08-10 | 重庆大学 | High-corrosion-resistance Mg-Zn-Sc magnesium alloy and preparation method thereof |
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| CN113234977A (en) * | 2021-05-10 | 2021-08-10 | 重庆大学 | High-corrosion-resistance Mg-Zn-Sc magnesium alloy and preparation method thereof |
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