CN105039817B - The preparation method and multicomponent heat-resistant magnesium alloy of a kind of multicomponent heat-resistant magnesium alloy - Google Patents
The preparation method and multicomponent heat-resistant magnesium alloy of a kind of multicomponent heat-resistant magnesium alloy Download PDFInfo
- Publication number
- CN105039817B CN105039817B CN201510435972.8A CN201510435972A CN105039817B CN 105039817 B CN105039817 B CN 105039817B CN 201510435972 A CN201510435972 A CN 201510435972A CN 105039817 B CN105039817 B CN 105039817B
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- China
- Prior art keywords
- magnesium alloy
- heat
- heat treatment
- multicomponent
- cooling
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- 229910000861 Mg alloy Inorganic materials 0.000 title claims abstract description 148
- 238000002360 preparation method Methods 0.000 title claims abstract description 39
- 238000010438 heat treatment Methods 0.000 claims abstract description 98
- 238000001816 cooling Methods 0.000 claims abstract description 59
- 239000011777 magnesium Substances 0.000 claims abstract description 22
- 229910052725 zinc Inorganic materials 0.000 claims abstract description 14
- FYYHWMGAXLPEAU-UHFFFAOYSA-N magnesium Chemical compound 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k6MTtzdHJva2U6IzAwMDAwMDtzdHJva2Utd2lkdGg6MHB4O3N0cm9rZS1saW5lY2FwOmJ1dHQ7c3Ryb2tlLWxpbmVqb2luOm1pdGVyO3N0cm9rZS1vcGFjaXR5OjE7JyAvPgo8L3N2Zz4K [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims abstract description 8
- 229910052749 magnesium Inorganic materials 0.000 claims abstract description 8
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Abstract
The invention discloses the preparation method and multicomponent heat-resistant magnesium alloy of a kind of multicomponent heat-resistant magnesium alloy.The method is comprised the following steps：1) as-cast magnesium alloy is made up of the component of following mass percent：Al 7.5~8.5%, Zn 0.8~1.2%, RE 1.2~2.4%, Ca 0.5~1.4%, balance of magnesium and impurity；As-cast magnesium alloy is carried out into one-level heat treatment, one-level heat treatment temperature is 420~440 DEG C, and the time is 4~6h, furnace cooling；2) two grades of heat treatments are carried out, two grades of heat treatment temperatures are 390~410 DEG C, and the time is 8~10 hours, water-cooled；3) three-level heat treatment is carried out, three-level heat treatment temperature is 200~220 DEG C, and the time is 12~15 hours, and air cooling is obtained final product.The heat treatment method that the present invention is provided, by two-stage solution treatment, is optimized the microscopic structure of magnesium alloy, so as to improve the final mechanical property of magnesium alloy.
Description
Technical field
The invention belongs to metal material metallurgy and technical field of heat treatment, and in particular to a kind of system of multicomponent heat-resistant magnesium alloy
Preparation Method and multicomponent heat-resistant magnesium alloy.
Background technology
Magnesium alloy as most light structural metallic materials, with specific strength and specific stiffness high, excellent casting character, machine
Tool processing characteristics, have a very wide range of applications prospect.Magnesium alloy applies increasing on automobile in recent years, and automobile uses magnesium
Alloy can with loss of weight, while reduce exhaust emissions, therefore magnesium alloy research and development for energy saving, suppress environmental pollution
Important in inhibiting.
Mg-Al-Zn systems magnesium alloy (such as AZ31, AZ61, AZ91) is the magnesium alloy being industrially most widely used at present
Series.The advantages of this serial magnesium alloy has good intensity, plasticity, corrosion resistance and cheap cost concurrently.But itself is deposited
In the shortcoming for being difficult to overcome：First, Mg in as cast condition Mg-Al-Zn systems magnesium alloy17Al12In netted in the form of divorsed eutectic
Intercrystalline precipitation, these thick Mg17Al12The presence of phase is unfavorable for the mechanical property of alloy.Additionally, when operating temperature is higher than
After 120 DEG C, the main hardening constituent Mg in this series alloy17Al12Can be roughened or soften so that its reinforcing to matrix
Effect is greatly lowered, and so as to reduce this serial magnesium alloy mechanical property at high temperature, limits Mg-Al-Zn systems magnesium and closes
The range of application of gold.
Addition alloying element is one of effective way of raising Properties of Magnesium Alloy.To mainly adding in Mg-Al-Zn systems magnesium alloy
Plus alloying element mainly have three classes：1. the alkaline earth element such as Ca, Sr；2. rare earth elements RE；3. the IVth, group Ⅴ element, such as Si,
Sn, Sb, Bi etc..While new performance is provided for magnesium alloy, also the heat treatment method to magnesium alloy is carried these alloying elements
Requirement higher is gone out.Due to the particularity of Mg-Al-Zn systems magnesium alloy, conventional Technology for Heating Processing is difficult to be effectively improved magnesium conjunction
The segregation of gold and the uniformity of precipitated phase, and easily there are the tissue defects such as shrinkage porosite and stomata, and then have impact in alloy structure
The mechanical property of magnesium alloy.
Patent CN103469039A discloses the magnesium-aluminum-zinc wrought magnesium alloy of a kind of calcic and rare earth samarium, its quality percentage
Content is Al 5.3~6.0%, Zn 0.7~1.0%, Ca 0.4~0.5%, Sm 0.2~1.5%, balance of Mg；By original
Material fusing, salt bath rapid cooling, the alloy spindle for obtaining homogenizing annealing at 400 DEG C is air cooled to room temperature, and 360 DEG C of extrusion ratios are 25:1
Hot extrusion is carried out, the magnesium-aluminum-zinc wrought magnesium alloy of calcic, rare earth samarium is obtained.The magnesium alloy by after hot extrusion deformation, alloy
Mutually refine, the tensile strength of material, yield strength and elongation percentage are improved.But hot extrusion technique needs specific extruding to set
It is standby, and size to material, shape are all restricted；Meanwhile, hot extrusion process is often accompanied by the heating such as more serious oxidation and decarburization
Defect, have impact on the dimensional accuracy and surface roughness of extrusion；These characteristics have impact on the technique in the industrial production big
Sizable application.
Develop a kind of equipment simple, cost is relatively low, safe and reliable, and easy to operate heat treatment method is for Mg-Al-Zn systems
Magnesium alloy plays an important roll.Heat treatment can effectively reduce casting internal stress, eliminate the segregation in alloy structure, make non-equilibrium
Phased soln homogenizes alloying component in matrix, when the solid solubility of alloying element is varied with temperature and changed, by solid solution
Treatment is remarkably improved Properties of Magnesium Alloy.The heat treatment of Mg-Al-Zn series cast magnesium alloys is generally comprised at solution treatment and timeliness
Two steps of reason, wherein solution treatment is the basic and key of the follow-up Ageing Treatment of alloy, how to obtain good by technology controlling and process
Good solid solution effect seems particularly critical for the heat treatment reinforcement of Mg-Al-Zn alloy.Solution treatment need to preferably at control
Reason temperature and treatment upper time, if temperature is too high or the heat time is long, can cause that tissue is grown up roughening, wasted heat；If warm
It is too short to spend the low or heat time, and alloying element dissolving is not enough, influences its mechanical property.Therefore, the heat of magnesium alloy how is optimized
Handling process, research and development novel magnesium alloy heat treatment method for playing the strong of casting Mg-Al-Zn alloy to greatest extent
Change effect is particularly important.
The content of the invention
It is an object of the invention to provide a kind of preparation method of multicomponent heat-resistant magnesium alloy, Mg-Al-Zn in the prior art is solved
It is that magnesium alloy causes the technical problem of magnesium alloy mechanical property difference because of segregation and precipitated phase distributing homogeneity difference.
Second object of the present invention is to provide a kind of multicomponent heat-resistant magnesium alloy obtained by above-mentioned preparation method.
In order to realize the above object the technical solution adopted in the present invention is：
A kind of preparation method of multicomponent heat-resistant magnesium alloy, comprises the following steps：
1) as-cast magnesium alloy is carried out into one-level heat treatment, the one-level heat treatment temperature is 420~440 DEG C, during heat treatment
Between be 4~6h, cooling；The as-cast magnesium alloy is made up of the component of following mass percent：Al 7.5~8.5%, Zn 0.8
~1.2%, RE 1.2~2.4%, Ca 0.5~1.4%, balance of magnesium and impurity；
2) by step 1) cooling after magnesium alloy carry out two grades heat treatment, two grades of heat treatment temperatures be 390~410
DEG C, heat treatment time is 8~10 hours, cooling；
3) by step 2) magnesium alloy after cooling carries out three-level heat treatment, and the three-level heat treatment temperature is 200~220
DEG C, heat treatment time is 12~15 hours, and cooling is obtained final product.
Step 1) in, RE is any one in Gd, Y, Nd, Sm.
Impurity is Fe, Cu and Ni, and total amount is less than 0.2wt%.
In the preparation method of above-mentioned multicomponent heat-resistant magnesium alloy, one-level heat treatment and two grades of heat treatments are solutionizing step,
Three-level heat treatment is Ageing Treatment step.Solution treatment is heated to high temperature monophase field and constant temperature holding by by alloy, makes surplus
Mutually it is substantially soluble in solid solution, then supersaturated solid solution is obtained by cooling；The heat treatment method that the present invention is provided, by two-stage
Solution treatment, it is to avoid the disadvantage of roughening that alloying element dissolving is not enough or alloy structure is grown up, makes the alloy precipitated phase be evenly distributed,
Alloy structure is optimized, so as to improve the final mechanical property of magnesium alloy.In alloy compositions, Ca has good in the magnesium alloy
Good crystal grain refinement and antioxidation, can Refining Mg Alloy matrix so as to improve magnesium alloy strength and plasticity；In Mg-
Mg is entered in Ca meeting solid solutions a small amount of in Al systems magnesium alloy17Al12Its heat endurance is improved in phase, and Ca easily forms high-temperature stable with Al
Al-Ca phases so as to improve alloy high-temp performance.Rare earth elements RE has solution strengthening and second-phase strength in adding magnesium alloy
Effect, so as to improve alloy mechanical performance.Additionally, the heat treatment method that the present invention is provided has device therefor simple, cost compared with
Low, safe and reliable, easy to operate advantage, is adapted to large-scale industrial production application.
Step 1) one-level heat treatment can carry out in various heat-treatment furnaces (such as chamber type electric resistance furnace), and one-level heat treatment is preferred
The type of cooling is furnace cooling, and the treatment can make the element in alloy that solid-state diffusion occurs, and mitigate microsegregation and dendrite
Segregation so that homogenization of composition, the diffusion of alloying element can be increased with stove Slow cooling, mitigate casting flaw, optimized alloy
Microscopic structure.
Step 2) type of cooling of two grades of heat treatments is preferably hot water cooling；Hot water temperature used is 70~90 DEG C, can
The supersaturated solid solution of magnesium alloy is obtained, and hot water quenching can reduce the hot cracking tendency of alloy, improve the integrality of tissue.
Step 3) type of cooling of three-level heat treatment is preferably air cooling, and the process is artificial aging treatment, solid from supersaturation
Diffusion-precipitation mutually can play a part of dispersion-strengtherning in solution.
Step 1) as-cast magnesium alloy is obtained by raw material various prior arts can be used.Step 1) as-cast magnesium alloy is preferred
Prepared by following methods：Under protective atmosphere, raw material is carried out into melting by proportioning, cast, obtain final product as-cast magnesium alloy.It is described
Protective atmosphere is CO2And SF6Mixed gas.The temperature of the casting is 710~730 DEG C.
Present invention simultaneously provides the multicomponent heat-resistant magnesium alloy that a kind of preparation method by above-mentioned multicomponent heat-resistant magnesium alloy is obtained.
The multicomponent heat-resistant magnesium alloy that the present invention is provided, distribution of each phase is uniform in alloy, and the intensity of alloy, heat resistance are significantly improved,
Room temperature tensile intensity reaches 273Mpa, and yield strength reaches 204MPa；Under 200 DEG C of operating temperatures, tensile strength and yield strength
Respectively reach 196Mpa and 141Mpa；Excellent in mechanical performance, with wide application space.
Brief description of the drawings
Fig. 1 is traditional magnesium alloy heat treatment process Temperature-time schematic diagram；
Fig. 2 is the preparation method Temperature-time relation schematic diagram of multicomponent heat-resistant magnesium alloy of the present invention；
Fig. 3 is the metallographic structure figure of comparative example of the present invention 1 and embodiment 1, wherein the metallographic structure figure of (a) for comparative example 1,
B () is the metallographic structure figure of embodiment 1.
Specific embodiment
With reference to specific embodiment, the present invention is further illustrated.
Embodiment 1
The preparation method of the present embodiment multicomponent heat-resistant magnesium alloy, comprises the following steps：
1) corundum crucible that will be equipped with raw material is put into intermediate frequency furnace, in CO2+SF6Melted under mixed gas protected
Refining, after melting sources, when magnesium alloy liquation is warming up into 720 DEG C, in casting to steel die, obtains as-cast magnesium alloy；As cast condition
The mass percent of magnesium alloy is constituted：Al 8.0%, Zn 1%, Y 1.7%, Ca 0.8%, balance of Mg and impurity；
2) by step 1) gained as-cast magnesium alloy one-level heat treatment is carried out in chamber type electric resistance furnace, one-level heat treatment temperature is
430 DEG C, one-level heat treatment time is 4 hours, furnace cooling；
3) by step 2) magnesium alloy after cooling is put into heat-treatment furnace and carries out two grades of heat treatments, and two grades of heat treatment temperatures are
400 DEG C, two grades of heat treatment times are 8 hours, are cooled down with 80 DEG C of hot water；
4) by step 3) cooling after magnesium alloy be put into heat-treatment furnace in carry out three-level heat treatment, three-level heat treatment temperature is
210 DEG C, three-level heat treatment time is 14 hours, and air cooling is obtained final product.
The mass percent composition of the preparation method gained multicomponent heat-resistant magnesium alloy of the present embodiment is Al 8%, Zn 1%, Y
1.7%, Ca 0.8%, balance of Mg and impurity.
Comparative example 1
The composition of the multicomponent heat-resistant magnesium alloy raw material of comparative example 1 is same as Example 1；The preparation technology and reality of as-cast magnesium alloy
Apply example 1 identical.The preparation method of the multicomponent heat-resistant magnesium alloy of comparative example 1, comprises the following steps：
1) as-cast magnesium alloy is carried out into solution treatment in chamber type electric resistance furnace, solid solution temperature is 420 DEG C, solution treatment
Time is 12 hours, is cooled down with 80 DEG C of hot water；
2) by step 1) cooling after magnesium alloy be put into heat-treatment furnace in carry out Ageing Treatment, aging temperature is 210
DEG C, aging time is 14 hours, and air cooling is obtained final product.
Embodiment 2
The preparation method of the present embodiment multicomponent heat-resistant magnesium alloy, comprises the following steps：
1) corundum crucible that will be equipped with raw material is put into intermediate frequency furnace, in CO2+SF6Melted under mixed gas protected
Refining, after melting sources, when magnesium alloy liquation is warming up into 710 DEG C, in casting to steel die, obtains as-cast magnesium alloy；As cast condition
The mass percent of magnesium alloy is constituted：Al 7.6%, Zn 1.2%, Gd 2.0%, Ca 0.6%, balance of Mg and impurity；
2) by step 1) gained as-cast magnesium alloy one-level heat treatment is carried out in chamber type electric resistance furnace, one-level heat treatment temperature is
420 DEG C, one-level heat treatment time is 5 hours, furnace cooling；
3) by step 2) magnesium alloy after cooling is put into heat-treatment furnace and carries out two grades of heat treatments, and two grades of heat treatment temperatures are
410 DEG C, two grades of heat treatment times are 9 hours, 80 DEG C of hot water coolings；
4) by step 3) cooling after magnesium alloy be put into heat-treatment furnace in carry out three-level heat treatment, three-level heat treatment temperature is
200 DEG C, three-level heat treatment time is 13 hours, and air cooling is obtained final product.
The present embodiment preparation method gained multicomponent heat-resistant magnesium alloy mass percent composition be Al 8%, Zn 1%,
Gd 2.0%, Ca 0.6%, balance of Mg and impurity.
Comparative example 2
The composition of the multicomponent heat-resistant magnesium alloy raw material of comparative example 2 is same as Example 2；The preparation technology and reality of as-cast magnesium alloy
Apply example 2 identical.The preparation method of the multicomponent heat-resistant magnesium alloy of comparative example 2, comprises the following steps：
1) as-cast magnesium alloy is carried out into solution treatment in chamber type electric resistance furnace, solid solution temperature is 415 DEG C, solution treatment
Time is 14 hours, 80 DEG C of hot water coolings；
2) by step 1) cooling after magnesium alloy be put into heat-treatment furnace in carry out Ageing Treatment, aging temperature is 200
DEG C, aging time is 13 hours, and air cooling obtains multicomponent heat-resistant magnesium alloy.
Embodiment 3
The preparation method of the present embodiment multicomponent heat-resistant magnesium alloy, comprises the following steps：
1) corundum crucible that will be equipped with raw material is put into intermediate frequency furnace, in CO2+SF6Melted under mixed gas protected
Refining, after melting sources, when magnesium alloy liquation is warming up into 730 DEG C, in casting to steel die, obtains as-cast magnesium alloy；As cast condition
The mass percent of magnesium alloy is constituted：Al 7.8%, Zn 0.9%, Nd 1.9%, Ca 1.0%, balance of Mg and impurity；
2) by step 1) gained as-cast magnesium alloy one-level heat treatment is carried out in chamber type electric resistance furnace, one-level heat treatment temperature is
430 DEG C, one-level heat treatment time is 4 hours, furnace cooling；
3) by step 2) magnesium alloy after cooling is put into heat-treatment furnace and carries out two grades of heat treatments, and two grades of heat treatment temperatures are
390 DEG C, two grades of heat treatment times are 10 hours, 90 DEG C of hot water coolings；
4) by step 3) cooling after magnesium alloy be put into heat-treatment furnace in carry out three-level heat treatment, three-level heat treatment temperature is
200 DEG C, three-level heat treatment time is 15 hours, and air cooling is obtained final product.
The present embodiment preparation method gained multicomponent heat-resistant magnesium alloy mass percent composition be Al 8%, Zn 1%,
Nd 1.9%, Ca 1.0%, balance of Mg and impurity.
Comparative example 3
The composition of the multicomponent heat-resistant magnesium alloy raw material of comparative example 3 is same as Example 3；The preparation technology and reality of as-cast magnesium alloy
Apply example 3 identical.The preparation method of the multicomponent heat-resistant magnesium alloy of comparative example 3, comprises the following steps：
1) as-cast magnesium alloy is carried out into solution treatment in chamber type electric resistance furnace, solid solution temperature is 425 DEG C, solution treatment
Time is 11 hours, 90 DEG C of hot water coolings；
2) by step 1) gained magnesium alloy is put into heat-treatment furnace and carries out Ageing Treatment, and aging temperature is 200 DEG C, when
Effect process time is 15 hours, and air cooling obtains multicomponent heat-resistant magnesium alloy.
Embodiment 4
The preparation method of the present embodiment multicomponent heat-resistant magnesium alloy, comprises the following steps：
1) corundum crucible that will be equipped with raw material is put into intermediate frequency furnace, in CO2+SF6Melted under mixed gas protected
Refining, after melting sources, when magnesium alloy liquation is warming up into 710 DEG C, in casting to steel die, obtains as-cast magnesium alloy；As cast condition
The mass percent of magnesium alloy is constituted：Al 8.3%, Zn 0.8%, Sm 1.3%, Ca 1.2%, balance of Mg and impurity；
2) by step 1) gained as-cast magnesium alloy one-level heat treatment is carried out in chamber type electric resistance furnace, one-level heat treatment temperature is
430 DEG C, one-level heat treatment time is 6 hours, furnace cooling；
3) by step 2) magnesium alloy after cooling is put into heat-treatment furnace and carries out two grades of heat treatments, and two grades of heat treatment temperatures are
410 DEG C, two grades of heat treatment times are 8 hours, 80 DEG C of hot water coolings；
4) by step 3) cooling after magnesium alloy be put into heat-treatment furnace in carry out three-level heat treatment, three-level heat treatment temperature is
200 DEG C, three-level heat treatment time is 15 hours, and air cooling is obtained final product.
The present embodiment preparation method gained multicomponent heat-resistant magnesium alloy mass percent composition be Al 8%, Zn 1%,
Sm 1.3%, Ca 1.2%, balance of Mg and impurity.
Comparative example 4
The composition of the multicomponent heat-resistant magnesium alloy raw material of comparative example 4 is same as Example 4；The preparation technology and reality of as-cast magnesium alloy
Apply example 4 identical.The preparation method of the multicomponent heat-resistant magnesium alloy of comparative example 4, comprises the following steps：
1) as-cast magnesium alloy is carried out into solution treatment in chamber type electric resistance furnace, solid solution temperature is 430 DEG C, solution treatment
Time is 10 hours, 80 DEG C of hot water coolings；
2) by step 1) cooling after magnesium alloy be put into heat-treatment furnace in carry out Ageing Treatment, aging temperature is 200
DEG C, aging time is 15 hours, and air cooling obtains multicomponent heat-resistant magnesium alloy.
Embodiment 5
The preparation method of the present embodiment multicomponent heat-resistant magnesium alloy, comprises the following steps：
1) corundum crucible that will be equipped with raw material is put into intermediate frequency furnace, in CO2+SF6Melted under mixed gas protected
Refining, after melting sources, when magnesium alloy liquation is warming up into 730 DEG C, in casting to steel die, obtains as-cast magnesium alloy；As cast condition
The mass percent of magnesium alloy is constituted：Al 8.4%, Zn 1.1%, Gd 2.3%, Ca 1.4%, balance of Mg and impurity；
2) by step 1) gained as-cast magnesium alloy one-level heat treatment is carried out in chamber type electric resistance furnace, one-level heat treatment temperature is
440 DEG C, one-level heat treatment time is 5 hours, furnace cooling；
3) by step 2) magnesium alloy after cooling is put into heat-treatment furnace and carries out two grades of heat treatments, and two grades of heat treatment temperatures are
390 DEG C, two grades of heat treatment times are 10 hours, 70 DEG C of hot water coolings；
4) by step 3) cooling after magnesium alloy be put into heat-treatment furnace in carry out three-level heat treatment, three-level heat treatment temperature is
220 DEG C, three-level heat treatment time is 14 hours, and air cooling is obtained final product.
The mass percent composition of the present embodiment preparation method gained multicomponent heat-resistant magnesium alloy is Al 8%, Zn 1%, Gd
2.3%, Ca 1.4%, balance of Mg and impurity.
Comparative example 5
The composition of the multicomponent heat-resistant magnesium alloy raw material of comparative example 5 is same as Example 5；The preparation technology and reality of as-cast magnesium alloy
Apply example 5 identical.The preparation method of the multicomponent heat-resistant magnesium alloy of comparative example 5, comprises the following steps：
1) as-cast magnesium alloy is carried out into solution treatment in chamber type electric resistance furnace, solid solution temperature is 410 DEG C, solution treatment
Time is 15 hours, 70 DEG C of hot water coolings；
2) by step 1) cooling after magnesium alloy be put into heat-treatment furnace in carry out Ageing Treatment, aging temperature is 220
DEG C, aging time is 14 hours, and air cooling obtains multicomponent heat-resistant magnesium alloy.
Test example
Detect that the multicomponent heat-resistant magnesium alloy of each embodiment and comparative example tension of (200 DEG C) under normal temperature and operating temperature is strong
Degree and yield strength, testing result are as shown in table 1.As can be seen from Table 1, the multicomponent heat-resistant for being obtained with heat treatment method of the present invention
Magnesium alloy is respectively provided with tensile strength and yield strength higher, excellent in mechanical performance at normal temperature and 200 DEG C.
The mechanics properties testing result of the multicomponent heat-resistant magnesium alloy of each embodiment of table 1 and comparative example
(note：(stove) represents that the type of cooling is that stove is cold；(water) represents that the type of cooling is cooled down for hot water, and water temperature is 70~90 DEG C；
(sky) represents that the type of cooling is air cooling.)
Traditional magnesium alloy heat treatment process Temperature-time schematic diagram as shown in figure 1, by after a solution treatment, water-cooled
Cooling；Then Ageing Treatment is carried out, air cooling obtains magnesium alloy；The temperature of the preparation method of multicomponent heat-resistant magnesium alloy of the invention-
As shown in Fig. 2 by Secondary Solid Solution Treatment, the type of cooling of Secondary Solid Solution Treatment is respectively that stove is cold and water to time relationship schematic diagram
It is cold；Then Ageing Treatment is carried out, air cooling obtains multicomponent heat-resistant magnesium alloy.By the optimization to Technology for Heating Processing, can close magnesium
The metallographic structure of gold is optimized, so that the intensity of alloy, heat resistance are significantly improved.
Fig. 3 is the metallographic structure figure of comparative example of the present invention 1 and embodiment 1, wherein the metallographic structure figure of (a) for comparative example 1,
B () is the metallographic structure figure of embodiment 1.Compared with the metallographic structure of comparative example, the multicomponent heat-resistant magnesium alloy that embodiment 1 is obtained,
Microsegregation and dendritic segregation are few, and alloying component homogenization degree is high, and disperse phase crystal grain refinement, is evenly distributed, and is conducive to
The generation of defect is reduced, the integrality of tissue is kept, macro-mechanical property is improved.
Claims (8)
1. a kind of preparation method of multicomponent heat-resistant magnesium alloy, it is characterised in that comprise the following steps：
1) as-cast magnesium alloy is carried out into one-level heat treatment, the one-level heat treatment temperature is 420~440 DEG C, and heat treatment time is 4
~6h, cooling；The as-cast magnesium alloy is made up of the component of following mass percent：Al 7.5~8.5%, Zn 0.8~
1.2%, RE 1.2~2.4%, Ca 0.5~1.4%, balance of magnesium and impurity；Wherein, RE is any one in Gd, Y, Nd, Sm
Kind；
2) by step 1) cooling after magnesium alloy carry out two grades heat treatment, two grades of heat treatment temperatures be 390~410 DEG C, heat
Process time is 8~10 hours, cooling；
3) by step 2) magnesium alloy after cooling carries out three-level heat treatment, and the three-level heat treatment temperature is 200~220 DEG C, heat
Process time is 12~15 hours, and cooling is obtained final product.
2. the preparation method of multicomponent heat-resistant magnesium alloy as claimed in claim 1, it is characterised in that step 1) in, it is described to be cooled to
Furnace cooling.
3. the preparation method of multicomponent heat-resistant magnesium alloy as claimed in claim 1, it is characterised in that step 2) in, it is described to be cooled to
Hot water is cooled down；Hot water temperature used is 70~90 DEG C.
4. the preparation method of multicomponent heat-resistant magnesium alloy as claimed in claim 1, it is characterised in that step 3) in, it is described to be cooled to
Air cooling.
5. as any one of Claims 1 to 4 multicomponent heat-resistant magnesium alloy preparation method, it is characterised in that step 1) institute
As-cast magnesium alloy is stated to be prepared by following methods：Under protective atmosphere, raw material is carried out into melting, casting by proportioning, obtain final product casting
State magnesium alloy.
6. the preparation method of multicomponent heat-resistant magnesium alloy as claimed in claim 5, it is characterised in that the protective atmosphere is CO2With
SF6Mixed gas.
7. the preparation method of multicomponent heat-resistant magnesium alloy as claimed in claim 5, it is characterised in that the temperature of the casting is 710
~730 DEG C.
8. the multicomponent heat-resistant magnesium alloy obtained by a kind of preparation method as described in claim 1.
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