CN111020326A - High-temperature creep resistant magnesium-aluminum alloy and preparation method thereof - Google Patents

High-temperature creep resistant magnesium-aluminum alloy and preparation method thereof Download PDF

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CN111020326A
CN111020326A CN201911234785.8A CN201911234785A CN111020326A CN 111020326 A CN111020326 A CN 111020326A CN 201911234785 A CN201911234785 A CN 201911234785A CN 111020326 A CN111020326 A CN 111020326A
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aluminum alloy
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CN111020326B (en
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王武孝
秦子禾
王娜
秦少勇
刘健
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Xian University of Technology
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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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D7/00—Casting ingots, e.g. from ferrous metals
    • B22D7/005—Casting ingots, e.g. from ferrous metals from non-ferrous metals
    • 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
    • C22C—ALLOYS
    • C22C1/00—Making non-ferrous alloys
    • C22C1/06—Making non-ferrous alloys with the use of special agents for refining or deoxidising
    • 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
    • C22F1/02—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working in inert or controlled atmosphere or vacuum
    • 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 high-temperature creep resistant magnesium-aluminum alloy which comprises the following raw materials in percentage by mass: 0.5 to 1.5 percent of Nd, 0.5 to 1.5 percent of Gd, 6 percent of Al and the balance of Mg, wherein the sum of the content of the raw materials is 100 percent; the invention also discloses a preparation method of the high-temperature creep resistant magnesium-aluminum alloy, which comprises the following steps: placing tools and raw materials required by smelting in a preheating furnace for preheating; smelting the preheated raw materials; carrying out ultrasonic treatment on the alloy liquid and then casting; and carrying out graded solution treatment and aging treatment on the alloy ingot in a molybdenum wire vacuum furnace to obtain the high-temperature creep resistant magnesium-aluminum alloy. The invention has the beneficial effects that: the creep resistance of the Mg-Al alloy is effectively improved, the preparation cost of the alloy is reduced, the traditional refining process is replaced by ultrasonic treatment and argon protective atmosphere, the emission of harmful gas in the alloy smelting process is effectively avoided, and the alloy is more environment-friendly.

Description

High-temperature creep resistant magnesium-aluminum alloy and preparation method thereof
Technical Field
The invention belongs to the technical field of magnesium-aluminum alloy, and particularly relates to high-temperature creep resistant magnesium-aluminum alloy and a preparation method of the high-temperature creep resistant magnesium-aluminum alloy.
Background
The magnesium-aluminum alloy has the characteristics of low density, high specific strength and specific rigidity, good electrical conductivity and heat dissipation, good electromagnetic shielding performance and the like, so that the magnesium-aluminum alloy has a very wide application prospect in various fields, and particularly has the advantage of difficult replacement in the aspect of automobile light weight. However, the creep resistance of die-cast Mg-Al alloy parts for automobiles is rapidly reduced when the working temperature of the die-cast Mg-Al alloy parts exceeds 120 ℃, and the die-cast Mg-Al alloy parts cannot be directly applied to engine pistons, engine cylinders, gearboxes and the like.
The reason that the high-temperature creep property of the magnesium-aluminum alloy is weaker mainly comprises two aspects, namely, along with the rise of the temperature, dislocation glide of a non-basal plane occurs in the magnesium alloy to form cross glide, and dislocation climb caused by diffusion occurs at the same time, so that the creep resistance of the die-cast magnesium alloy is reduced; second, eutectic precipitation phase Mg distributed on the crystal boundary17Al12The melting point (437 ℃) is low, and the alloy is easy to soften and coarsen under high temperature, and can not pin grain boundaries, thereby causing grain boundary slippage.
The addition of rare earth elements into the magnesium-aluminum alloy is a method mainly used for improving the creep resistance of the magnesium-aluminum alloy at present, the rare earth elements Nd, Gd, Y, Ce and the like added into the magnesium-aluminum alloy can generate excellent solid solution strengthening and aging strengthening effects in the magnesium-aluminum alloy, and simultaneously the rare earth elements can be combined with aluminum elements in the magnesium-aluminum alloy to reduce the softening phase Mg while generating high-melting-point compounds17Al12Thereby greatly improving the creep resistance of the magnesium alloy.
Disclosure of Invention
The invention aims to provide a high-temperature creep resistant magnesium-aluminum alloy, which solves the problem of poor high-temperature creep resistance of the magnesium-aluminum alloy in the prior art.
The invention also aims to provide a preparation method of the high-temperature creep resistant magnesium-aluminum alloy.
The invention adopts the technical scheme that the high-temperature creep resistant magnesium-aluminum alloy comprises the following raw materials in percentage by mass:
0.5 to 1.5 percent of Nd, 0.5 to 1.5 percent of Gd, 6 percent of Al and the balance of Mg, wherein the sum of the content of the raw materials is 100 percent.
The invention is also characterized in that:
the sum of the mass percent of Nd and Gd is not more than 2.5 percent.
The invention adopts another technical scheme that the preparation method of the high-temperature creep resistant magnesium-aluminum alloy is implemented according to the following steps:
step 1, coating a dry coating on a tool required for smelting, placing the tool in a preheating furnace for heat preservation and drying, and placing a pure magnesium ingot, an aluminum ingot and intermediate alloys Mg-Gd and Mg-Nd in the preheating furnace for preheating;
step 2, smelting the preheated pure magnesium ingot, the preheated aluminum ingot and the intermediate alloys Mg-Gd and Mg-Nd under a protective atmosphere, adding a covering agent, and stirring to obtain a uniform alloy liquid;
step 3, carrying out ultrasonic treatment on the alloy liquid under a protective atmosphere, and then casting the alloy liquid into a metal mold to obtain an alloy ingot;
step 4, carrying out graded solution treatment and aging treatment on the alloy ingot in a vacuum molybdenum wire furnace to obtain the high-temperature creep resistant magnesium-aluminum alloy, wherein the high-temperature creep resistant magnesium-aluminum alloy comprises the following raw material components in percentage by mass: 0.5 to 1.5 percent of Nd, 0.5 to 1.5 percent of Gd, 6 percent of Al and the balance of Mg, wherein the sum of the content of the raw materials is 100 percent.
The other technical scheme of the invention is also characterized in that:
in the step 1: the dry coating is ZnO coating, and the mass percent is respectively: 65% of water, 5% of water glass and 30% of zinc oxide; the drying temperature is 200-210 ℃, and the heat preservation time is 2-2.5 h; the preheating temperature is 200-210 ℃, and the heat preservation time is 2-2.5 h.
In the step 2: the covering agent is RJ-2 covering agent, and the mass percentage is as follows: 3% -5% of CaF2、32％～40％KCL、5％～8％BaCl2、38％～46％MgCl2。
In the step 2: Mg-Gd, wherein the Mg-Nd intermediate alloy is Mg-30% of Gd and Mg-30% of Nd.
In the step 2: the protective gas is argon, the smelting temperature is 700-720 ℃, and the temperature is kept for 25-40 min; the stirring mode is mechanical stirring, and the stirring time is 5-10 min.
In the step 3: the ultrasonic treatment frequency is 25kHz, and the treatment power is 500-560W; the ultrasonic probe extends into the liquid level of the magnesium alloy liquid by less than 40 mm.
In the step 3: the preheating temperature of the metal mold is 200-210 ℃; the casting temperature is 600-650 ℃.
In the step 4: the vacuum environment in the molybdenum wire vacuum furnace is 3.8-4.0 multiplied by 10-3Pa, the temperature of the first stage of the solution treatment is 300-350 ℃, the heat preservation time is 2-4 h, the temperature of the second stage of the solution treatment is 410-430 ℃, and the heat preservation time is 16-20 h; the aging treatment temperature is 200-220 ℃, and the heat preservation time is 20-24 h.
The invention has the beneficial effects that: according to the preparation method of the creep-resistant magnesium-aluminum alloy, the trace rare earth elements Nd and Gd are added into the magnesium-aluminum alloy, the smelting casting and heat treatment processes are improved, the creep resistance of Mg-Al series alloy is effectively improved, the preparation cost of the alloy is reduced, the traditional refining process is replaced by ultrasonic treatment and argon protective atmosphere, the emission of harmful gas in the alloy smelting process is effectively avoided, and the preparation method is more environment-friendly.
Drawings
FIG. 1 is a schematic view of an electromagnetic induction furnace used in the high temperature creep resistant magnesium-aluminum alloy and the preparation method thereof;
FIG. 2 is a diagram of a compression device used in a high temperature creep test of the high temperature creep resistant magnesium-aluminum alloy and the preparation method thereof.
In the figure, 1, a stirring rod, 2, a stretchable cover opening, 3, an argon pipeline, 4, an ultrasonic probe, 5, a load applying device, 6, a displacement sensor, 7, a data processing terminal, 8, a heat preservation furnace and 9, a thermocouple are arranged.
Detailed Description
The present invention will be described in detail with reference to the following embodiments.
The invention relates to a high-temperature creep resistant magnesium-aluminum alloy which comprises the following raw materials in percentage by mass: 0.5 to 1.5 percent of Nd0.5 percent, 0.5 to 1.5 percent of Gd, 6 percent of Al and the balance of Mg, wherein the total content of the raw materials is 100 percent.
Wherein the sum of the mass percent of Nd and Gd is not more than 2.5 percent.
The invention relates to a preparation method of high-temperature creep resistant magnesium-aluminum alloy, which is implemented according to the following steps:
step 1, coating a dry coating on a tool required for smelting, placing the tool in a preheating furnace for heat preservation and drying, and placing a pure magnesium ingot, an aluminum ingot and intermediate alloys Mg-Gd and Mg-Nd in the preheating furnace for preheating;
step 2, smelting the preheated pure magnesium ingot, the preheated aluminum ingot and the intermediate alloys Mg-Gd and Mg-Nd under a protective atmosphere, adding a covering agent, and stirring to obtain a uniform alloy liquid;
step 3, carrying out ultrasonic treatment on the alloy liquid under a protective atmosphere, and then casting the alloy liquid into a metal mold to obtain an alloy ingot;
step 4, carrying out graded solution treatment and aging treatment on the alloy ingot in a vacuum molybdenum wire furnace to obtain the high-temperature creep resistant magnesium-aluminum alloy, wherein the high-temperature creep resistant magnesium-aluminum alloy comprises the following raw material components in percentage by mass: 0.5 to 1.5 percent of Nd, 0.5 to 1.5 percent of Gd, 6 percent of Al and the balance of Mg, wherein the sum of the content of the raw materials is 100 percent.
In the step 1, the drying coating is a ZnO coating, and the mass percentages are respectively as follows: 65% of water, 5% of water glass and 30% of zinc oxide; the drying temperature is 200-210 ℃, and the heat preservation time is 2-2.5 h; the preheating temperature is 200-210 ℃, and the heat preservation time is 2-2.5 h.
In the step 2, the covering agent is RJ-2 covering agent, and the mass percentage is as follows: 3% -5% of CaF2、32％～40％KCL、5％～8％BaCl2、38％～46％MgCl2。
In the step 2, the Mg-Gd and Mg-Nd intermediate alloy is Mg-30% of Gd and Mg-30% of Nd.
In the step 2, the protective gas is argon, the smelting temperature is 700-720 ℃, and the temperature is kept for 25-40 min; the stirring mode is mechanical stirring, and the stirring time is 5-10 min.
In the step 3, the ultrasonic treatment frequency is 25kHz, and the treatment power is 500-560W; the ultrasonic probe extends into the liquid level of the magnesium alloy liquid for 30-50 mm.
In the step 3, preheating the metal mold at 200-210 ℃; the casting temperature is 600-650 ℃.
In the step 4, the vacuum environment in the vacuum molybdenum wire furnace is 3.8-4.0 multiplied by 10-3Pa, the temperature of the first stage of the solution treatment is 300-350 ℃, the heat preservation time is 2-4 h, the temperature of the second stage of the solution treatment is 410-430 ℃, and the heat preservation time is 16-20 h; the aging treatment temperature is 200-220 ℃, and the heat preservation time is 20-24 h.
Example 1
The high-temperature creep resistant magnesium-aluminum alloy comprises the following raw materials in percentage by mass: 1% of Nd, 0.5% of Gd, 6% of Al and the balance of Mg, wherein the sum of the contents of the raw materials is 100%.
The preparation method comprises the following steps:
step 1, coating zinc oxide coating on a stirring tool and a mould required by smelting, and preserving heat for 2.5 hours in a 200 ℃ preheating furnace by using intermediate alloys Mg-Nd and Mg-Gd as well as pure magnesium ingots and aluminum ingots.
Step 2, putting the preheated pure magnesium ingot, the preheated aluminum ingot and the intermediate alloys Mg-Gd and Mg-Nd into an electromagnetic induction furnace shown in figure 1 for smelting, adding RJ-2 covering agent, introducing argon through an argon pipeline 3 for protection, preventing the magnesium alloy from oxidizing and burning, keeping the temperature at 700 ℃ for 40min, opening a stretchable cover opening 2, inserting a stirring rod 1 into a crucible, mechanically stirring for 5min, taking out, closing the cover opening, and obtaining uniform magnesium alloy liquid
Wherein the covering agent is RJ-2 covering agent, and the mass percentage is as follows: 3% -5% of CaF2、32％～40％KCL、5％～8％BaCl2、38％～46％MgCl2(ii) a The Mg-Gd, Mg-Nd intermediate alloy is Mg-30 percent Gd，Mg-30％Nd。
And 3, under the protection of argon atmosphere, powering off and standing until the temperature of the magnesium alloy liquid is reduced to 640 ℃, extending the ultrasonic probe 4 into the position 30-50mm below the liquid level of the alloy liquid from the stretchable cover opening 2 to perform ultrasonic treatment with the power of 500W, cooling the alloy liquid along with the furnace during the ultrasonic treatment, stopping applying ultrasonic waves when the temperature of the alloy liquid is reduced to 600 ℃, and casting the alloy liquid into a carbon steel mold preheated to 200 ℃ to obtain an alloy ingot.
Step 4, placing the alloy cast ingot into a vacuum molybdenum wire furnace, opening a mechanical pump to vacuumize for 30min until the pressure in the furnace is less than 4 multiplied by 100When Pa, the diffusion pump is opened, and the vacuum is continuously pumped to 3.8-4.0 multiplied by 10-3Pa, heating the molybdenum wire furnace to 350 ℃, preserving heat for 4 hours, then heating to 410 ℃, preserving heat for 20 hours, after the temperature rise is finished, closing the diffusion pump, inflating the furnace until the air pressure is less than 0.1Pa, opening the air release valve to release pressure, taking out the alloy ingot, and carrying out water cooling in water at 40 ℃; and keeping the temperature of the aging treatment at 200 ℃ for 20 hours, and cooling in air to obtain the high-temperature creep resistant magnesium-aluminum alloy.
Example 2
The high-temperature creep resistant magnesium-aluminum alloy comprises the following raw materials in percentage by mass: 0.5 percent of Nd, 1.5 percent of Gd, 6 percent of Al and the balance of Mg, wherein the sum of the contents of the raw materials is 100 percent.
The preparation method comprises the following steps:
step 1, coating zinc oxide drying agent on a stirring tool and a mould required by smelting, and preserving heat for 2.2 hours in a preheating furnace at 205 ℃, and preserving heat for 2.2 hours in the preheating furnace at 205 ℃ for intermediate alloys Mg-Nd and Mg-Gd as well as pure magnesium ingots and aluminum ingots.
And 2, putting the preheated pure magnesium ingot, the preheated aluminum ingot and the intermediate alloys Mg-Gd and Mg-Nd into an electromagnetic induction furnace as shown in figure 1 for smelting, adding an RJ-2 covering agent, introducing argon through an argon pipeline 3 for protection to prevent the magnesium alloy from oxidizing and burning, keeping the temperature at 710 ℃ for 35min, opening the stretchable cover opening 2, inserting the stirring rod 1 into a crucible, mechanically stirring for 8min, taking out, and closing the cover opening to obtain a uniform magnesium alloy liquid.
Wherein the covering agent is RJ-2 covering agent, and the mass percentage is as follows: 3% -5% of CaF2、32％～40％KCL、5％～8％BaCl2、38％～46％MgCl2(ii) a Mg-Gd, wherein the Mg-Nd intermediate alloy is Mg-30% of Gd and Mg-30% of Nd.
And 3, under the protection of argon atmosphere, powering off and standing until the temperature of the magnesium alloy liquid is reduced to 650 ℃, extending an ultrasonic probe 4 into the position 30-50mm below the liquid level of the alloy liquid from the stretchable cover opening 2 to perform ultrasonic treatment with the power of 530W, cooling the alloy liquid along with the furnace during the ultrasonic treatment, stopping applying ultrasonic waves when the temperature of the alloy liquid is reduced to 620 ℃, and casting the alloy liquid into a carbon steel mold preheated to 205 ℃ to obtain an alloy ingot.
Step 4, placing the alloy cast ingot into a vacuum molybdenum wire furnace, opening a mechanical pump to vacuumize for 30min until the pressure in the furnace is less than 4 multiplied by 100When Pa, the diffusion pump is opened, and the vacuum is continuously pumped to 3.8-4.0 × 10-3Pa，
Heating the molybdenum wire furnace to 320 ℃ and preserving heat for 3h, then heating to 420 ℃ again and preserving heat for 18h, after the temperature rise is finished, closing the diffusion pump, inflating the furnace until the air pressure is less than 0.1Pa, opening the air release valve to release pressure, taking out the alloy ingot, and cooling in water at 40 ℃. And the aging treatment temperature is 210 ℃, the temperature is kept for 22h, and the high-temperature creep resistant magnesium-aluminum alloy is obtained after the magnesium-aluminum alloy is cooled in the air.
Example 3
The high-temperature creep resistant magnesium-aluminum alloy comprises the following raw materials in percentage by mass: 1.5 percent of Nd, 1 percent of Gd, 6 percent of Al and the balance of Mg, wherein the sum of the contents of the raw materials is 100 percent.
The creep-resistant Mg-Al alloy in the embodiment comprises the following components in percentage by mass: . The preparation method comprises the following steps:
step 1, coating zinc oxide coating on a stirring tool and a mould required by smelting, and preserving heat for 2 hours in a preheating furnace at the temperature of 210 ℃ for intermediate alloys Mg-Nd and Mg-Gd as well as pure magnesium ingots and aluminum ingots.
And 2, putting the preheated pure magnesium ingot, the preheated aluminum ingot and the intermediate alloys Mg-Gd and Mg-Nd into an electromagnetic induction furnace as shown in figure 1 for smelting, adding an RJ-2 covering agent, introducing argon gas atmosphere through an argon gas pipeline 3 for protection to prevent the magnesium alloy from oxidizing and burning, keeping the temperature at 720 ℃ for 25min, opening the stretchable cover port 2, inserting the stirring rod 1 into a crucible, and mechanically stirring for 10min to obtain uniform magnesium alloy liquid.
Wherein the covering agent is RJ-2 covering agent, and the mass percentage is as follows: 3% -5% of CaF2、32％～40％KCL、5％～8％BaCl2、38％～46％MgCl2(ii) a Mg-Gd, wherein the Mg-Nd intermediate alloy is Mg-30% of Gd and Mg-30% of Nd.
And 3, under the protection of argon atmosphere, powering off and standing until the temperature of the magnesium alloy liquid is reduced to 660 ℃, extending the ultrasonic probe 4 into the position 30-50mm below the liquid level of the alloy liquid from the stretchable cover opening 2 to perform ultrasonic treatment with the power of 560W, cooling the alloy liquid along with the furnace during the ultrasonic treatment, stopping applying ultrasonic waves when the temperature of the alloy liquid is reduced to 650 ℃, and casting the alloy liquid into a carbon steel mold preheated to 210 ℃ to obtain an alloy ingot.
Step 4, placing the alloy cast ingot into a vacuum molybdenum wire furnace, opening a mechanical pump to vacuumize for 30min until the pressure in the furnace is less than 4 multiplied by 100When Pa, the diffusion pump is opened, and the vacuum is continuously pumped to 3.8-4.0 multiplied by 10-3Pa, heating the molybdenum wire furnace to 300 ℃, preserving heat for 2h, then raising the temperature to 430 ℃, preserving heat for 16h, after the temperature is raised, closing the diffusion pump, inflating the furnace until the air pressure is less than 0.1Pa, opening the air release valve to release pressure, taking out the alloy ingot, performing water cooling in water at 40 ℃, preserving heat for 24h at the aging treatment temperature of 220 ℃, and cooling in air to obtain the high-temperature creep resistant magnesium-aluminum alloy.
The high-temperature creep resistance testing device is shown in fig. 2, and the testing conditions are as follows: compressing the sample to
Figure BDA0002304588660000092
The creep temperature of the cylinder (D) was 200 ℃ and the stress was 70MPa, and the results are shown in Table 1.
As can be seen from Table 1, the high-temperature creep-resistant alloy material has relatively good high-temperature creep resistance, the creep strain amount is as low as 0.79 percent under the conditions of 200 ℃/70MPa and 120h, and the steady-state creep rate is as low as 5.545 multiplied by 10-8s-1。
TABLE 1 test results of high temperature creep resistance
Figure BDA0002304588660000091

Claims (10)

1. The high-temperature creep resistant magnesium-aluminum alloy is characterized by comprising the following raw materials in percentage by mass:
0.5 to 1.5 percent of Nd, 0.5 to 1.5 percent of Gd, 6 percent of Al and the balance of Mg, wherein the sum of the content of the raw materials is 100 percent.
2. The high temperature creep resistant magnesium aluminum alloy as claimed in claim 1, wherein the sum of the mass percentages of Nd and Gd is not more than 2.5%.
3. The preparation method of the high-temperature creep resistant magnesium-aluminum alloy is characterized by comprising the following steps:
step 1, coating a dry coating on a tool required for smelting, placing the tool in a preheating furnace for heat preservation and drying, and placing a pure magnesium ingot, an aluminum ingot and intermediate alloys Mg-Gd and Mg-Nd in the preheating furnace for preheating;
step 2, smelting the preheated pure magnesium ingot, the preheated aluminum ingot and the intermediate alloys Mg-Gd and Mg-Nd under a protective atmosphere, adding a covering agent, and stirring to obtain a uniform alloy liquid;
step 3, carrying out ultrasonic treatment on the alloy liquid under a protective atmosphere, and then casting the alloy liquid into a metal mold to obtain an alloy ingot;
step 4, carrying out graded solution treatment and aging treatment on the alloy ingot in a vacuum molybdenum wire furnace to obtain the high-temperature creep resistant magnesium-aluminum alloy, wherein the high-temperature creep resistant magnesium-aluminum alloy comprises the following raw material components in percentage by mass: 0.5 to 1.5 percent of Nd, 0.5 to 1.5 percent of Gd0.5, 6 percent of Al and the balance of Mg, wherein the sum of the contents of the raw materials is 100 percent.
4. The method for preparing the high temperature creep resistant magnesium-aluminum alloy according to claim 3, wherein in the step 1: the dry coating is ZnO coating, and the mass percent is respectively: 65% of water, 5% of water glass and 30% of zinc oxide; the drying temperature is 200-210 ℃, and the heat preservation time is 2-2.5 h; the preheating temperature is 200-210 ℃, and the heat preservation time is 2-2.5 h.
5. The method for preparing the high temperature creep resistant magnesium-aluminum alloy according to claim 3, wherein in the step 2: the covering agent is RJ-2 covering agent, and the mass percentage is as follows: 3% -5% of CaF2、32％～40％KCL、5％～8％BaCl2、38％～46％MgCl2。
6. The method for preparing the high temperature creep resistant magnesium-aluminum alloy according to claim 3, wherein in the step 2: Mg-Gd, wherein the Mg-Nd intermediate alloy is Mg-30% of Gd and Mg-30% of Nd.
7. The method for preparing the high temperature creep resistant magnesium-aluminum alloy according to claim 3, wherein in the step 2: the protective gas is argon, the smelting temperature is 700-720 ℃, and the temperature is kept for 25-40 min; the stirring mode is mechanical stirring, and the stirring time is 5-10 min.
8. The method for preparing the high temperature creep resistant magnesium-aluminum alloy according to claim 3, wherein in the step 3: the ultrasonic treatment frequency is 25kHz, and the treatment power is 500-560W; the ultrasonic probe extends into the liquid level of the magnesium alloy liquid for 30-50 mm.
9. The method for preparing the high temperature creep resistant magnesium-aluminum alloy according to claim 3, wherein in the step 3: the preheating temperature of the metal mold is 200-210 ℃; the casting temperature is 600-650 ℃.
10. The method for preparing the high temperature creep resistant magnesium-aluminum alloy according to claim 3, wherein in the step 4: the vacuum environment in the molybdenum wire vacuum furnace is 3.8-4.0 multiplied by 10-3Pa, the temperature of the first stage of the solution treatment is 300-350 ℃, the heat preservation time is 2-4 h, and the first stage of the solution treatmentThe temperature of the second stage is 410-430 ℃, and the heat preservation time is 16-20 h; the aging treatment temperature is 200-220 ℃, and the heat preservation time is 20-24 h.
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