CN113005347A - High-plasticity Mg-Al-Ca magnesium alloy and preparation method thereof - Google Patents
High-plasticity Mg-Al-Ca magnesium alloy and preparation method thereof Download PDFInfo
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- 229910000861 Mg alloy Inorganic materials 0.000 title claims abstract description 47
- 238000002360 preparation method Methods 0.000 title claims abstract description 13
- 239000000956 alloy Substances 0.000 claims abstract description 93
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 90
- 238000005096 rolling process Methods 0.000 claims abstract description 38
- 230000032683 aging Effects 0.000 claims abstract description 26
- 239000011777 magnesium Substances 0.000 claims abstract description 21
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 15
- 229910052749 magnesium Inorganic materials 0.000 claims abstract description 12
- 229910052791 calcium Inorganic materials 0.000 claims abstract description 11
- 239000012535 impurity Substances 0.000 claims abstract description 6
- 239000011575 calcium Substances 0.000 claims description 48
- 238000010438 heat treatment Methods 0.000 claims description 36
- 238000010791 quenching Methods 0.000 claims description 17
- 230000000171 quenching effect Effects 0.000 claims description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 17
- 239000007789 gas Substances 0.000 claims description 16
- 239000002994 raw material Substances 0.000 claims description 14
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims description 10
- 230000009467 reduction Effects 0.000 claims description 10
- 238000003723 Smelting Methods 0.000 claims description 8
- 230000001681 protective effect Effects 0.000 claims description 8
- 229910000831 Steel Inorganic materials 0.000 claims description 7
- 239000010959 steel Substances 0.000 claims description 7
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 6
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 6
- ZFXVRMSLJDYJCH-UHFFFAOYSA-N calcium magnesium Chemical compound [Mg].[Ca] ZFXVRMSLJDYJCH-UHFFFAOYSA-N 0.000 claims description 6
- 238000001816 cooling Methods 0.000 claims description 6
- 238000003756 stirring Methods 0.000 claims description 6
- 229910000882 Ca alloy Inorganic materials 0.000 claims description 5
- 238000002156 mixing Methods 0.000 claims description 5
- 229910052786 argon Inorganic materials 0.000 claims description 3
- 230000002431 foraging effect Effects 0.000 claims description 3
- 239000003973 paint Substances 0.000 claims 1
- 238000000034 method Methods 0.000 abstract description 12
- 238000001556 precipitation Methods 0.000 abstract description 3
- 239000007769 metal material Substances 0.000 abstract description 2
- 238000007670 refining Methods 0.000 abstract description 2
- 239000006104 solid solution Substances 0.000 abstract description 2
- 230000002349 favourable effect Effects 0.000 abstract 1
- 230000001737 promoting effect Effects 0.000 abstract 1
- 239000000243 solution Substances 0.000 description 15
- 230000008569 process Effects 0.000 description 10
- 239000013078 crystal Substances 0.000 description 4
- 238000004321 preservation Methods 0.000 description 4
- 229910052761 rare earth metal Inorganic materials 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 238000005728 strengthening Methods 0.000 description 3
- 230000004913 activation Effects 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 150000002910 rare earth metals Chemical class 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 229910003023 Mg-Al Inorganic materials 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000001627 detrimental effect Effects 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
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- 238000009826 distribution Methods 0.000 description 1
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- 238000004134 energy conservation Methods 0.000 description 1
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- 230000002401 inhibitory effect Effects 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
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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
- C22C23/02—Alloys based on magnesium with aluminium as the next major constituent
-
- 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
-
- 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 provides a high-plasticity Mg-Al-Ca magnesium alloy and a preparation method thereof, belonging to the technical field of metal materials, wherein the alloy consists of Mg, Al and Ca elements; the mass percent of each component is Al: 2.5-3.5%, Ca: 0.5-2%, and the balance of Mg and inevitable impurities less than or equal to 0.05%. The invention utilizes a three-step solid solution method to spheroidize a coarse second phase in a cast structure; and further refining a second phase in the as-cast structure by combining multi-pass rotation and 90-degree rolling deformation; meanwhile, the rotation for 90 degrees for rolling is favorable for promoting the dynamic precipitation of fine submicron Al with high thermal stability in the alloy2Ca strengthens the phase and weakens the alloy texture; then, a large amount of GP zones and nano-grade Al are formed through two-stage aging treatment2The Ca phase further improves the alloy strength without reducing the plasticity. High plasticity prepared by the inventionThe Mg-Al-Ca magnesium alloy has higher yield strength and good room temperature elongation, wherein the elongation exceeds 20 percent, and provides a new technical scheme for preparing the magnesium alloy with high Ca content.
Description
Technical Field
The invention relates to the technical field of metal materials, in particular to a high-plasticity Mg-Al-Ca magnesium alloy and a preparation method thereof.
Background
The light high-performance magnesium alloy can obviously reduce the weight of structural parts, realize the light weight in the manufacturing fields of automobiles, aerospace and the like, and further meet the requirements of environmental protection, energy conservation and emission reduction. Commercial magnesium alloys such as AZ31 have higher specific strength than most aluminum alloys and steels, but their strong basal plane texture and anisotropy are such that the elongation in the extrusion or rolling direction is only 10% to 15%, and their poor formability at room temperature limits their wide use. Therefore, there is an urgent need to develop a low-cost wrought magnesium alloy having high ductility at room temperature and suitable for forming at room temperature.
Studies have shown that the ductility of magnesium alloys can be improved by the addition of rare earth elements to weaken the texture and promote activation of the non-basal slip system. However, the rare earth elements are expensive, so that the production cost of the rare earth magnesium alloy is high. The addition of Ca element in the magnesium alloy can effectively refine the grain size of the alloy and improve the flame retardance, the room temperature mechanical property and the high temperature creep resistance of the alloy. Recent studies show that Al and Ca elements can form Al with high thermal stability in dispersion distribution2Ca and Al4The second phase such as Ca can effectively block dislocation movement and pin grain boundaries, thereby improving the strength and creep resistance of the alloy. In addition, the addition of Al and Ca elements is beneficial to the conical surface<c+a>Activation of the sliding system improves the plasticity of the alloy. Magnesium alloy with Al and Ca addedA multi-atomic layer nano Guinier-Preston (G.P.) area rich in Al-Ca atoms can be formed in the aging process, the aging precipitation strengthening effect is obvious, and the yield strength of the alloy is increased. However, most studies on high-plasticity Mg-Al-Ca based magnesium alloys maintain the amounts of Al and Ca added below the solubility limit in the magnesium matrix to prevent the formation of hard brittle phases Mg detrimental to the toughness of the magnesium alloy17Al12、Mg2Ca phase and coarse Al2A Ca phase. When the Ca addition is higher than 0.5 wt%, the Mg-Al-Ca series magnesium alloy has high strength, poor plasticity and room temperature deformability, so that the Mg-Al-Ca series magnesium alloy is difficult to form by a rolling method, generally, the Mg-Al-Ca series magnesium alloy with high Ca content can only be prepared by a high-temperature low-speed slow extrusion process, but the processing cost is higher. Therefore, the development of a low-cost high-plasticity Mg-Al-Ca series magnesium alloy preparation process is urgently needed.
Disclosure of Invention
The invention provides a high-plasticity Mg-Al-Ca magnesium alloy and a preparation method thereof, aiming at solving the problems of poor room-temperature plasticity, mismatched strong plasticity, high cost of rare earth magnesium alloy and the like of commercial wrought magnesium alloy. According to the invention, by controlling the component proportion of the alloy, a plastic processing process combining the stepped solution heat treatment with 3-10-pass rotary rolling is adopted, and each pass is rotated for 90 degrees (the total rolling reduction of the pass is 50% -90%), so that the rotary rolling can weaken the texture, facilitate the alloy formability and promote the fine submicron Al with high thermal stability2Dynamic precipitation of a Ca second phase; simultaneously, a two-stage aging heat treatment process is adopted to form a large amount of GP zones and nano-grade Al2The Ca phase further improves the strength on the premise of not reducing the plasticity, so that the alloy has higher yield strength and good room-temperature elongation (the room-temperature tensile yield strength is more than 190MPa, and the room-temperature elongation is more than 20%), and a new idea is provided for the preparation of the high-Ca-content wrought magnesium alloy.
In order to achieve the aim, the invention provides a high-plasticity Mg-Al-Ca magnesium alloy which comprises the following components in percentage by mass: al: 2.5-3.5%, Ca: 0.5-2%, and the balance of Mg and inevitable impurities less than or equal to 0.05%;
the preparation method of the magnesium alloy comprises the following steps:
(1) preparing an alloy ingot: under the condition of protective gas, smelting pure magnesium, pure aluminum and magnesium-calcium intermediate alloy which are used as raw materials at 680-720 ℃, stirring for 5-10 minutes at 680-700 ℃ after the raw materials are completely melted, standing and preserving heat for 10-20 minutes at 680-720 ℃, finally pouring into a steel mould preheated to 200-300 ℃, and cooling to room temperature to obtain an alloy ingot;
(2) solution heat treatment: carrying out three-stage stepped solution treatment on the alloy ingot obtained in the step (1), wherein the three-stage stepped solution treatment comprises the following steps: heating to 400-440 ℃, preserving heat for 3-5 hours, heating to 450-475 ℃, preserving heat for 3-5 hours, finally heating to 480-520 ℃, preserving heat for 3-5 hours, and then water quenching to room temperature to obtain an alloy blank;
(3) plastic deformation: heating the alloy blank obtained in the step (2) to 300-350 ℃, preserving heat for 10-40 minutes, performing rolling deformation for 3-10 passes, rotating each pass from the second pass to the final pass by 90 degrees in the same direction, rolling, wherein the total reduction is 50-90%, preserving heat for 10-40 minutes at the temperature of 350 ℃ for the alloy after each pass, and then performing next pass of rolling to finally obtain an alloy plate;
(4) aging treatment: performing two-stage aging treatment on the alloy plate obtained in the step (3): heating to 50-100 ℃, then preserving heat for 12-24h for pre-aging treatment, then water quenching to room temperature, then preserving heat at 120-200 ℃ for 1-3 h for aging treatment, and then water quenching to room temperature to obtain the high-plasticity Mg-Al-Ca alloy.
Further, the protective gas in the step (1) is SF6And CO2Mixed gas or argon and SF6And (4) mixing the gases.
Further, the step (3) is subjected to rolling deformation of 5-7 passes.
Further, the alloy blank in the step (3) is heated to 320-350 ℃ and then is subjected to heat preservation for 20-30 minutes.
Further, the total pressure reduction amount in the step (3) is 60-90%.
Further, the alloy after each rolling in the step (3) is subjected to heat preservation at the temperature of 320-350 ℃ for 10-15 minutes and then subjected to next rolling.
Further, the alloy plate in the step (4) is heated to 50-90 ℃ and then is subjected to heat preservation for 16-20 hours for pre-aging treatment.
Further, the alloy plate in the step (4) is subjected to aging treatment at the temperature of 150-200 ℃ for 1-2 hours.
The invention has the advantages that:
(1) the invention adds alkaline earth Ca element into Mg-Al alloy to preferentially precipitate Al with higher thermal stability2The Ca phase is beneficial to inhibiting the growth of crystal grains in the magnesium matrix, thereby achieving the purpose of refining the crystal grains; through the second phase (Al)2The combined action of Ca phase)/GP zone strengthening and fine grain strengthening improves the mechanical property of the alloy at room temperature.
(2) The three-stage stepped solid solution at different temperatures adopted by the invention is beneficial to the low-melting-point second phase (such as Mg) in the as-cast alloy17Al12Phase) re-dissolution and a second phase (Al) difficult to be solid-dissolved2Ca and (Mg, Al)2Ca phase) spheroidization, the plastic deformation capability of the alloy is improved; then, the second phase is crushed and fine Al is promoted in the high-temperature deformation process by rotating for 3-10 times, rotating for 90 degrees between each time and carrying out heat preservation treatment2The Ca phase is dynamically precipitated, so that the crystal grains are dynamically recrystallized to weaken the texture, and the room temperature plasticity and the formability of the alloy are further improved; finally, a large number of GP zones and nano-grade Al are formed through two-stage aging treatment2The Ca phase further improves the strength without lowering the plasticity.
(3) The invention selects cheap Ca element and optimized deformation process, the prepared alloy has higher yield strength and good room temperature elongation (the room temperature tensile yield strength is more than 190MPa, the room temperature elongation is more than 20%), and the problem of poor room temperature plasticity of the magnesium alloy with high Ca content is solved.
Drawings
FIG. 1 is an SEM photograph of an as-cast Mg-Al-Ca alloy in example 1;
FIG. 2 is an SEM photograph of a Mg-Al-Ca alloy after undergoing plastic deformation by spin rolling in example 1;
FIG. 3 is a high-magnification SEM photograph of a second phase of the Mg-Al-Ca alloy after plastic deformation by spin rolling in example 1.
Detailed Description
Example 1
The preparation method of the high-plasticity Mg-2.8Al-1Ca magnesium alloy (the mass percentage of each component of the magnesium alloy is 2.8 percent of Al, 1 percent of Ca, and the balance of Mg and inevitable impurities is less than or equal to 0.05 percent):
(1) preparing an alloy ingot: mixing the raw materials according to the components of the magnesium alloy, smelting pure magnesium, pure aluminum and magnesium-calcium intermediate alloy as raw materials at 680 ℃, wherein the smelting process is carried out in protective gas (SF)6And CO2Mixed gas), stirring for 10 minutes at 680 ℃ after the raw materials are completely melted, standing and preserving heat for 10 minutes at 720 ℃, finally pouring into a steel mould preheated to 200 ℃, and cooling to room temperature to obtain an alloy ingot;
(2) solution heat treatment: carrying out three-stage stepped solution treatment on the alloy ingot obtained in the step (1), wherein the three-stage stepped solution treatment comprises the following steps: heating to 400 ℃, preserving heat for 3 hours, then heating to 465 ℃, preserving heat for 3 hours, finally heating to 500 ℃, preserving heat for 3 hours, and then water quenching to room temperature to obtain an alloy blank;
(3) plastic deformation: heating the alloy blank obtained in the step (2) to 350 ℃, preserving heat for 20 minutes, performing rolling deformation for 6 times, rotating each time from the second time to the sixth time by 90 degrees according to the same direction, rolling, wherein the total reduction is 80%, preserving heat for 10 minutes at 350 ℃ for the alloy after each time of rolling, and then performing next time of rolling to finally obtain an alloy plate with the thickness of 1.2 mm;
(4) aging treatment: performing two-stage aging treatment on the alloy plate obtained in the step (3): heating to 70 ℃ and preserving heat for 20h for pre-aging treatment, then water quenching to room temperature, then preserving heat at 200 ℃ for 1 h, and then water quenching to room temperature to obtain the high-plasticity Mg-2.8Al-1Ca alloy.
The Mg-2.8Al-1Ca alloy plate in the embodiment has no edge crack and good formability, the as-cast SEM picture of the Mg-2.8Al-1Ca alloy plate is shown as the attached drawing 1, and the as-cast structure in the magnesium alloy with high Ca content contains a large amount of coarse second phases as shown in the attached drawing 1; the alloy after 6-pass rotary rolling deformation is shown in the attached figures 2 and 3, and can be seen from the attached figures 2 and 3: the coarse second phase in the alloy as-cast structure is broken and rolledIn the process, nano-grade Al with high density and uniform distribution is dynamically precipitated2The Ca phase enables alloy crystal grains to be dynamically recrystallized so as to weaken the texture, thereby further improving the room temperature plasticity and the formability of the alloy; finally, a large number of GP zones and nano-grade Al are formed through two-stage aging treatment2The Ca phase further improves the strength without lowering the plasticity. Mechanical property test is carried out along the rolling direction at room temperature, and the room-temperature mechanical property of the high-plasticity Mg-2.8Al-1Ca magnesium alloy obtained in the step (4) of the embodiment is as follows: the tensile yield strength and the elongation are 196MPa and 20.1 percent respectively, so the magnesium alloy obtained by the embodiment has better room-temperature high plasticity.
Comparative example 1
Another preparation method of Mg-2.8Al-1Ca is provided, which comprises the following steps:
(1) preparing an alloy ingot: mixing the raw materials according to the components of the magnesium alloy, smelting pure magnesium, pure aluminum and magnesium-calcium intermediate alloy as raw materials at 680 ℃, wherein the smelting process is carried out in protective gas (SF)6And CO2Mixed gas), stirring for 10 minutes at 680 ℃ after the raw materials are completely melted, standing and preserving heat for 10 minutes at 720 ℃, finally pouring into a steel mould preheated to 200 ℃, and cooling to room temperature to obtain an alloy ingot;
(2) solution heat treatment: carrying out solution treatment on the alloy ingot obtained in the step (1) by keeping the temperature at 400 ℃ for 10 hours and then carrying out water quenching to room temperature to obtain an alloy blank;
(3) plastic deformation: heating the alloy blank obtained in the step (2) to 350 ℃, preserving heat for 20 minutes, then carrying out 6-pass traditional horizontal rolling, preserving heat for 10 minutes at 350 ℃ for the alloy after each pass of rolling, and then carrying out next pass of rolling, wherein the total reduction is 80%, thus obtaining an alloy plate;
(4) aging treatment: and (4) preserving the heat of the alloy plate obtained in the step (3) for 1 hour at 200 ℃, performing aging treatment, and performing water quenching to room temperature to obtain the Mg-2.8Al-1Ca alloy.
The room temperature mechanical properties of the Mg-2.8Al-1Ca magnesium alloy prepared in comparative example 1 are as follows: the tensile yield strength and elongation were 183MPa and 10.6%, respectively.
Example 2
The preparation method of the high-plasticity Mg-3Al-1.2Ca magnesium alloy (the mass percentage of each component of the magnesium alloy is 3 percent of Al, 1.2 percent of Ca and the balance of Mg and inevitable impurities is less than or equal to 0.05 percent):
(1) preparing an alloy ingot: according to the ingredients of the magnesium alloy, pure magnesium, pure aluminum and magnesium-calcium intermediate alloy are used as raw materials to be smelted at 690 ℃, and the smelting process is carried out in the presence of protective gas (SF)6And CO2Mixed gas), firstly stirring for 8 minutes at 690 ℃ after all raw materials are melted, then standing and preserving heat for 15 minutes at 710 ℃, finally pouring into a preheated 225 ℃ steel mould, and cooling to room temperature to obtain an alloy ingot;
(2) solution heat treatment: carrying out three-stage stepped solution treatment on the alloy ingot obtained in the step (1), wherein the three-stage stepped solution treatment comprises the following steps: heating to 410 ℃, preserving heat for 3 hours, heating to 470 ℃, preserving heat for 3 hours, finally heating to 505 ℃, preserving heat for 3 hours, and then water quenching to room temperature to obtain an alloy blank;
(3) plastic deformation: heating the alloy blank obtained in the step (2) to 340 ℃, preserving heat for 30 minutes, performing 5-pass rolling deformation, rotating each pass from the second pass to the fifth pass by 90 degrees in the same direction, rolling, wherein the total reduction is 60%, and performing next-pass rolling on the alloy after each pass of rolling after preserving heat for 15 minutes at 340 to finally obtain an alloy plate with the thickness of 2.4 mm;
(4) aging treatment: performing two-stage aging treatment on the alloy plate obtained in the step (3): firstly heating to 80 ℃ and preserving heat for 18h for pre-aging treatment, then water quenching to room temperature, then preserving heat at 180 ℃ for 2 h, and then water quenching to room temperature to obtain the high-plasticity Mg-3Al-1.2Ca alloy.
The alloy plate obtained by the embodiment has the advantages of no edge crack, good formability, good mechanical property and high plasticity.
Example 3
The preparation method of the high-plasticity Mg-3.1Al-1.5Ca magnesium alloy (the mass percentage of each component of the magnesium alloy is 3.1 percent of Al, 1.5 percent of Ca and the balance of Mg and inevitable impurities is less than or equal to 0.05 percent):
(1) preparing an alloy ingot: mixing the pure magnesium according to the components of the magnesium alloyPure aluminum and magnesium-calcium intermediate alloy as raw materials are smelted at 700 ℃, and the smelting process is carried out in the presence of protective gas (argon and SF)6Mixed gas), stirring for 5 minutes at 700 ℃ after the raw materials are completely melted, standing at 700 ℃ for 20 minutes, pouring into a steel mould preheated to 250 ℃, and cooling to room temperature to obtain an alloy ingot;
(2) solution heat treatment: carrying out three-stage stepped solution treatment on the alloy ingot obtained in the step (1), wherein the three-stage stepped solution treatment comprises the following steps: heating to 420 ℃, preserving heat for 3 hours, heating to 475 ℃, preserving heat for 3 hours, finally heating to 510 ℃, preserving heat for 3 hours, and then water quenching to room temperature to obtain an alloy blank;
(3) plastic deformation: heating the alloy blank obtained in the step (2) to 350 ℃, preserving heat for 20 minutes, performing 7-pass rolling deformation, rotating each pass from the second pass to the seventh pass by 90 degrees in the same direction, rolling, wherein the total reduction is 90%, preserving heat for 15 minutes at 350 ℃ for the alloy after each pass of rolling, and then performing the next pass of rolling to finally obtain an alloy plate with the thickness of 0.6 mm;
(4) aging treatment: performing two-stage aging treatment on the alloy plate obtained in the step (3): heating to 85 ℃, preserving heat for 16h for pre-aging treatment, then water quenching to room temperature, then preserving heat for 1.5 h at 190 ℃, and then water quenching to room temperature to obtain the high-plasticity Mg-3.1Al-1.5Ca alloy. The alloy plate obtained by the embodiment has the advantages of no edge crack, good formability, good mechanical property and high plasticity.
Claims (8)
1. A high-plasticity Mg-Al-Ca magnesium alloy is characterized in that: the paint comprises the following components in percentage by mass: al: 2.5-3.5%, Ca: 0.5-2%, and the balance of Mg and inevitable impurities less than or equal to 0.05%;
the preparation method of the magnesium alloy comprises the following steps:
(1) preparing an alloy ingot: under the condition of protective gas, smelting pure magnesium, pure aluminum and magnesium-calcium intermediate alloy which are used as raw materials at 680-720 ℃, stirring for 5-10 minutes at 680-700 ℃ after the raw materials are completely melted, standing and preserving heat for 10-20 minutes at 680-720 ℃, finally pouring into a steel mould preheated to 200-300 ℃, and cooling to room temperature to obtain an alloy ingot;
(2) solution heat treatment: carrying out three-stage stepped solution treatment on the alloy ingot obtained in the step (1), wherein the three-stage stepped solution treatment comprises the following steps: heating to 400-440 ℃, preserving heat for 3-5 hours, heating to 450-475 ℃, preserving heat for 3-5 hours, finally heating to 480-520 ℃, preserving heat for 3-5 hours, and then water quenching to room temperature to obtain an alloy blank;
(3) plastic deformation: heating the alloy blank obtained in the step (2) to 300-350 ℃, preserving heat for 10-40 minutes, performing rolling deformation for 3-10 passes, rotating each pass from the second pass to the final pass by 90 degrees in the same direction, rolling, wherein the total reduction is 50-90%, preserving heat for 10-40 minutes at the temperature of 350 ℃ for the alloy after each pass, and then performing next pass of rolling to finally obtain an alloy plate;
(4) aging treatment: performing two-stage aging treatment on the alloy plate obtained in the step (3): heating to 50-100 ℃, then preserving heat for 12-24h for pre-aging treatment, then water quenching to room temperature, then preserving heat at 120-200 ℃ for 1-3 h for aging treatment, and then water quenching to room temperature to obtain the high-plasticity Mg-Al-Ca alloy.
2. A high-plasticity Mg-Al-Ca magnesium alloy according to claim 1, wherein: the protective gas in the step (1) is SF6And CO2Mixed gas or argon and SF6And (4) mixing the gases.
3. A high-plasticity Mg-Al-Ca magnesium alloy according to claim 1, wherein: and (3) carrying out rolling deformation for 5-7 passes.
4. A high-plasticity Mg-Al-Ca magnesium alloy according to claim 1, wherein: and (3) heating the alloy blank to 320-350 ℃, and then preserving heat for 20-30 minutes.
5. A high-plasticity Mg-Al-Ca magnesium alloy according to claim 1, wherein: the total pressure reduction amount in the step (3) is 60-90%.
6. A high-plasticity Mg-Al-Ca magnesium alloy according to claim 1, wherein: and (3) preserving the heat of the alloy subjected to each rolling pass at the temperature of 320-350 ℃ for 10-15 minutes, and then performing next rolling pass.
7. A high-plasticity Mg-Al-Ca magnesium alloy according to claim 1, wherein: and (4) heating the alloy plate in the step (4) to 50-90 ℃, and then preserving heat for 16-20h for pre-aging treatment.
8. A high-plasticity Mg-Al-Ca magnesium alloy according to claim 1, wherein: and (4) preserving the heat of the alloy plate at the temperature of 150-200 ℃ for 1-2 hours for aging treatment.
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| CN113649416A (en) * | 2021-07-22 | 2021-11-16 | 吉林大学 | Method for promoting precipitation of second phase of magnesium alloy through multidirectional hot rolling and annealing treatment |
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| CN113005347B (en) | 2021-10-08 |
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Application publication date: 20210622 Assignee: Yangzhou Shimei Metal Technology Co.,Ltd. Assignor: Jilin University Contract record no.: X2023220000009 Denomination of invention: A high plasticity Mg Al Ca magnesium alloy and its preparation method Granted publication date: 20211008 License type: Common License Record date: 20231212 |