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A deformable low-expansion magnesium alloy

A low-expansion, alloy technology, applied in the field of low-expansion, deformable Mg-Zr alloys, can solve the problems of poor distribution uniformity of Zr elements, etc., and achieve the effects of reduced expansion coefficient, improved strength and corrosion resistance, and improved plastic formability

Active Publication Date: 2019-11-08
厦门火炬特种金属材料有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Add Zr in the form of potassium fluorozirconate, the content in magnesium is not more than 30wt%, and the distribution of Zr element in magnesium is poor, usually it can only be used as Mg-Zr master alloy for smelting and alloying of magnesium alloys
[0004] It is well known that when an alloying element is added in large quantities to the element being alloyed, it usually results in significant brittleness of the metal

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] A binary Mg-Zr low-expansion magnesium alloy material, in which Zr element content is about 35.0wt%, and the rest is magnesium; under an argon protective atmosphere, 35wt.% zirconium powder is fully mixed with a certain proportion of magnesium powder. After the two are fully mixed, they are sintered and formed under external pressure. The external pressure is controlled at about 85MPa, the sintering temperature is controlled at about 600°C, and the heat preservation is about 30min; the subsequent heat treatment is carried out under the protection of argon, and the heat treatment temperature is about 500°C. , holding time is 2h. Tested in the temperature range of 0 ~ 300 ℃, the linear expansion coefficient of the material is 14.8×10 -6 / °C (GB / T 4339-2008). Test mechanical properties (ASTM / B557M) at room temperature, the tensile strength is 224.1MPa, and the elongation is 13.0%.

Embodiment 2

[0016] A binary Mg-Zr low-expansion magnesium alloy material, in which the Zr element content is about 45.0wt.%, and the rest is magnesium; under an argon protective atmosphere, 45wt.% zirconium powder is fully mixed with a certain proportion of magnesium powder . After the two are fully mixed, they are sintered under external pressure, the external pressure is controlled at about 100MPa, the sintering temperature is controlled at about 620°C, and the heat preservation is about 40min; the subsequent heat treatment is carried out under the protection of argon, and the heat treatment temperature is about 520°C , holding time is 4h. Tested in the temperature range of 0 ~ 300 ℃, the linear expansion coefficient of the material is 12.6×10 -6 / °C (GB / T 4339-2008). Test mechanical properties (ASTM / B557M) at room temperature, the tensile strength is 248.5MPa, and the elongation is 15.6%.

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Abstract

The invention discloses deformable low-expansion Mg-Zr alloy. The alloy has low linear expansion coefficient and good plastic machinability. By combining a powder metallurgy manner with a high-temperature annealing process, the novel low-expansion and deformable-machineable Mg-Zr alloy with compact tissues and uniform components can be synthesized. The content of Zr in a magnesium alloy matrix reaches up to 35wt%-45wt%, when the magnesium alloy matrix is heated / cooled in a temperature range of 0-300 DEG C, the linear expansion coefficient of the alloy is 12.6*10<6>%-14.8*10<6>%. Meanwhile, theroom-temperature mechanical property of the alloy material is good, the extension strength is 224.1MPa-248.5MPa, and the elongation rate is 13.0%-15.6%.

Description

technical field [0001] The invention belongs to the technical field of functional materials, and in particular relates to a low-expansion, deformable Mg-Zr alloy. Background technique [0002] In the field of deep space exploration, materials must withstand alternating temperature differences in the range of -200 to 200°C and continuous space radiation tests. Magnesium alloy material is currently the lightest metal structure engineering material (specific gravity is 1.74g / cm 3 around), however high coefficient of expansion (2.7×10 -5 / ℃) lead to poor stability of magnesium alloy space parts, which limits its promotion and application in the fields of national defense and aerospace. Si particles have low expansion coefficient and small specific gravity, so they are usually used as reinforcing phases commonly used in traditional low-expansion composite materials. For example, some low-expansion aluminum alloys contain Si element content exceeding 50wt%, and powder metallurgy...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C23/00C22C1/04C22F1/06
CPCC22C1/0408C22C23/00C22F1/06
Inventor 邹宏辉温军国史学栋陈东旭陈松马志新任思远
Owner 厦门火炬特种金属材料有限公司
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