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High-strength and high-toughness Mg-Al-Zn system magnesium alloy preparation method

A high-strength, high-toughness, magnesium alloy technology, applied in the field of magnesium alloy materials, can solve the problems of unfavorable comprehensive mechanical properties of magnesium alloys, increased alloy manufacturing costs, large size of the second phase, etc., to achieve excellent comprehensive mechanical properties, simple implementation, and improved The effect of comprehensive mechanical properties

Inactive Publication Date: 2019-04-05
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the patent ① uses a large amount of rare earth elements, which increases the manufacturing cost of the alloy; ② the second phase of the as-cast magnesium alloy is usually concentrated in the grain boundary, and the second phase is large in size and irregular in shape, which is not conducive to the production of magnesium alloys. Comprehensive mechanical properties, especially the toughness of the alloy

Method used

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  • High-strength and high-toughness Mg-Al-Zn system magnesium alloy preparation method
  • High-strength and high-toughness Mg-Al-Zn system magnesium alloy preparation method
  • High-strength and high-toughness Mg-Al-Zn system magnesium alloy preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0027] A high-strength and high-toughness Mg-Al-Zn series magnesium alloy

[0028] The specific embodiment of preparation is as follows:

[0029] 1. Heat 88wt% of Mg, 8.5wt% of Al and 0.5wt% of Zn in an argon protective atmosphere to 810°C for melting, then cool to 720°C for heat preservation.

[0030] 2. Add 3wt% graphene and stir mechanically.

[0031] 3. Inject the alloy solution into the mold cavity, and die-cast to obtain the as-cast magnesium alloy.

[0032] 4. Put the as-cast magnesium alloy into a nitrogen-protected heat treatment furnace, heat it to 410°C at a heating rate of 5°C / min, and keep it warm for 20 hours.

[0033] 5. After the heat preservation is over, cool down the magnesium alloy to 100°C at a cooling rate of 1°C / min.

[0034] 6. Heat the magnesium alloy to 315°C at a heating rate of 10°C / min, and cool down to room temperature at a cooling rate of 5°C / min after holding for 10 hours.

[0035] 7. Take out the material from the heating furnace to obtain ...

Embodiment 2

[0037] A high-strength and high-toughness Mg-Al-Zn series magnesium alloy

[0038] The specific embodiment of preparation is as follows:

[0039] 1. Heat 90wt% Mg, 7.7wt% Al and 0.3wt% Zn under an argon protective atmosphere to 830°C for melting, then cool to 750°C to keep the temperature.

[0040] 2. Add 2wt% graphene and stir mechanically.

[0041] 3. Inject the alloy solution into the mold cavity, and die-cast to obtain the as-cast magnesium alloy.

[0042] 4. Put the as-cast magnesium alloy into a nitrogen-protected heat treatment furnace, heat it to 400°C at a heating rate of 3°C / min, and keep it warm for 22 hours.

[0043] 5. After the heat preservation is over, cool down the magnesium alloy to 100°C at a cooling rate of 0.5°C / min.

[0044] 6. Heat the magnesium alloy to 320°C at a heating rate of 8°C / min, and cool down to room temperature at a cooling rate of 6°C / min after holding for 12 hours.

[0045] 7. Take out the material from the heating furnace to obtain the...

Embodiment 3

[0047] A high-strength and high-toughness Mg-Al-Zn series magnesium alloy

[0048] The specific embodiment of preparation is as follows:

[0049] 1. Heat 83.9wt% Mg, 10wt% Al and 1.1wt% Zn under an argon protective atmosphere to 900°C for melting, then cool to 650°C to keep the temperature.

[0050] 2. Add 5wt% graphene and stir mechanically.

[0051] 3. Inject the alloy solution into the mold cavity, and die-cast to obtain the as-cast magnesium alloy.

[0052] 4. Put the as-cast magnesium alloy into a nitrogen-protected heat treatment furnace, heat it to 420°C at a heating rate of 8°C / min, and keep it warm for 16 hours.

[0053] 5. After the heat preservation is over, cool down the magnesium alloy to 110°C at a cooling rate of 2°C / min.

[0054] 6. Heat the magnesium alloy to 280° C. at a heating rate of 10° C. / min, and cool down to room temperature at a cooling rate of 10° C. / min after holding for 15 hours.

[0055] 7. Take out the material from the heating furnace to obt...

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Abstract

The invention belongs to the field of magnesium alloy materials, and discloses a high-strength and high-toughness Mg-Al-Zn system magnesium alloy preparation method. According to the preparation method, raw materials of Mg, Al and Zn are smelt in an inert protective atmosphere, and cooling and heat preservation are carried out after smelting; graphene raw material is added into magnesium alloy solution, and the alloy solution is subjected to uniformly stirring; the alloy solution is injected into a die for die-cast formation; the die-cast formed magnesium alloy is placed in a protective atmosphere thermal treatment furnace for second-phase spheroidizing treatment; and finally the high-strength and high-toughness Mg-Al-Zn system magnesium alloy with fine grains and second-phase spherical fine dispersed distribution is taken out from the thermal treatment furnace. According to the method, an added graphene grain refiner does not generate any toxic and harmful gas in the smelting process,the environment-friendly effect is achieved, and the refining effect is remarkable; and the second phase spheroidizing technology provided by the method is simple to implement, no special or expensive equipment is needed, and the alloy after thermal treatment can obtain excellent comprehensive mechanical properties.

Description

technical field [0001] The invention belongs to the field of magnesium alloy materials, and in particular relates to a preparation method of a Mg-Al-Zn series magnesium alloy. Background technique [0002] Magnesium alloy has a series of advantages such as low density, high specific strength and specific stiffness, good damping and electromagnetic shielding, and has broad application prospects in the fields of automobile and aircraft manufacturing. However, important structural parts in these fields have high requirements on the strength and toughness of materials. Although the Mg-Al-Zn series magnesium alloy, which is most widely used as a structural material, has high specific strength, it still has problems such as low strength, poor plasticity and deformation ability compared with the widely used steel and aluminum alloys at present. It is difficult to replace it as a structural material, which greatly restricts the application and development of magnesium alloys. [0...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/02C22C23/02C22F1/06C22F1/02
CPCC22C1/02C22C23/02C22C32/0084C22F1/02C22F1/06
Inventor 王太勇李妍
Owner TIANJIN UNIV
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