Process for preparing magnesium alloy and its composite material

A composite material and preparation technology, which is applied in the field of metal matrix composite material processing, can solve the problems of complex hot pressing equipment, large investment, and low benefit

Inactive Publication Date: 2005-03-02
TONGJI UNIV
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  • Abstract
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Problems solved by technology

In addition, the hot pressing equipment is very com...

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  • Process for preparing magnesium alloy and its composite material
  • Process for preparing magnesium alloy and its composite material

Examples

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Embodiment 1

[0025] Example 1: Preparation of powdered Mg70-Al16-Cu3-Zn5-RE3-Mn2-Si1 alloy.

[0026] The magnesium alloy powder was ball milled for 5 hours under the protection of ethanol, the ball-to-material ratio was 20:1, and the rotational speed was 300 r / min. According to the theoretical density of the original magnesium alloy 2.0g / cm 3 , select 6.4g of magnesium alloy powder after ball milling, and the volume after pressing is 3.2cm 3 . Put the magnesium alloy powder into the hot pressing mold. During hot pressing, first raise the temperature to 200°C, keep it warm for half an hour, then raise the temperature to 300°C, keep it warm for 1 hour, and keep adjusting the pressure during the sintering process so that the density of the magnesium alloy is close to its theoretical density. The whole sintering process takes 2.5 hours. Hot rolling is carried out at 200°C, the heating rate is 20°C / min, the reduction rate is 50%, the feed rate is 0.3m / min, and the material yield strength σ ...

Embodiment 2

[0027] Example 2: Preparation of metal nickel-titanium long fiber reinforced magnesium alloy.

[0028] Mg80-Al10-Cu5-Zn2-RE1-Mn1.5-Si0.5 alloy was used as the base material, and it was ball milled for 8 hours under the protection of ethanol, the ball-to-material ratio was 15:1, and the rotational speed was 400r / min. Put the magnesium alloy powder and the nickel-titanium fiber into the hot pressing mold according to the sandwich structure. During hot pressing, first raise the temperature to 200°C, keep it warm for half an hour, then raise the temperature to 320°C, keep it warm for 2 hours, and gradually apply pressure during the sintering process, up to 375Mpa. The whole sintering process is 3.5 hours. The obtained composite material has uniform structure and good fiber / matrix combination. Hot rolling is carried out at 300°C, the heating rate is 15°C / min, the reduction rate is 30%, and the feed rate is 0.1m / min. Composite yield strength σ 0.2 Reach 260Mpa, tensile strength ...

Embodiment 3

[0029] Example 3: Preparation of a magnesium alloy reinforced with short aluminum-titanium fibers.

[0030] Mg70-Al16-Cu5-Zn5-RE2-Mn1-Si1 alloy was used as the matrix material, and ball milled for 8 hours under the protection of ethanol, the ball-to-material ratio was 15:1, and the rotational speed was 400r / min. The magnesium alloy powder and the aluminum-titanium fiber are uniformly mixed by ball milling, and the time of ball milling again is 15 minutes at a rotation speed of 300 r / min, under vacuum protection. Put the mixture into a hot-pressing mold for hot pressing, first raise the temperature to 200°C, keep it warm for half an hour, then raise the temperature to 450°C, keep it warm for 1 hour, and gradually apply pressure during the sintering process. The whole sintering process is 3 hours. The obtained composite material has uniform structure and good fiber / matrix combination. Hot rolling is carried out at 250°C, the heating rate is 15°C / min, the reduction rate is 40%,...

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Abstract

The present invention relates to preparation process of magnesium alloy and its composite material, and is a breakthrough in powder metallurgical technology. The preparation process includes smelting magnesium alloy ingot, ball milling to produce powder, hot pressing and sintering, hot rolling treatment, etc. The present invention combines powder pressing and powder sintering to raise the strength of composite material, improve the toughness, lower the sintering temperature, reduce the sintering time and lower the power consumption. During the operation, no protective gas is added, and the material does not be oxidized, resulting in simple and reliable apparatus, low cost and high practicability.

Description

technical field [0001] The invention belongs to the technical field of metal matrix composite material processing, and in particular relates to a preparation process of magnesium alloy and composite material thereof. Background technique [0002] Powder metallurgy is a traditional solid-state preparation method for preparing magnesium alloys and their composite materials. Its technology is mainly powder pressing and sintering. Powder pressing and sintering are two independent processes, and a large amount of gas is required as a protective atmosphere during the preparation process to prevent the oxidation of magnesium or magnesium alloys. The hot pressing or hot consolidation that appeared later includes uniaxial hot pressing and pressure sintering, hot isostatic pressing, hot extrusion and hot forging, which are pressurized and heated at the same time, unlike conventional powder metallurgy processes that are first pressurized and formed After heating and sintering, the pr...

Claims

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Application Information

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IPC IPC(8): C22C1/04C22C23/02C22F1/06
Inventor 严彪李刚陆伟唐人剑殷俊林
Owner TONGJI UNIV
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