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Mg-Zn-RE-Zr magnesium alloy and thermal treatment method thereof

A heat treatment method, mg-zn-re-zr technology, applied in the field of metal structural materials, can solve the problem of single heat treatment method, and achieve the effect of being suitable for large-scale production, uniform distribution, and avoiding the increase of internal stress

Inactive Publication Date: 2014-07-09
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] It is found through document retrieval of the prior art that the heat treatment method for Mg-Zn-RE-Zr series magnesium alloys is relatively single, as in "Heat Treatment Technology Data Manual" (Beijing: Machinery Industry Press, 2006) edited by Fan Dongli et al. , the heat treatment method of cast Mg-(3.5~5.0)Zn-(0.7~1.7)RE-Zr(wt.%) alloy is limited to 325℃×(5~8)h, and the tensile strength and elongation in this state Rate standards are 220MPa and 4.0% respectively
Obviously, the improvement of the mechanical properties of cast Mg-Zn-RE-Zr magnesium alloys by traditional heat treatment methods cannot meet the needs of different applications in the fields of aerospace and national defense.

Method used

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  • Mg-Zn-RE-Zr magnesium alloy and thermal treatment method thereof
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  • Mg-Zn-RE-Zr magnesium alloy and thermal treatment method thereof

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Embodiment 1

[0030] This embodiment relates to a kind of Mg-Zn-RE-Zr series magnesium alloy casting: Mg-3.0Zn-1.0RE-0.3Nd-0.4Zr (percentage by weight, wt.%) alloy is pressed according to corresponding After the ingredients are melted, the temperature is raised to 780 ° C, and the temperature is kept for 20 minutes, and then the temperature is lowered to 730 ° C ~ 740 ° C, the scum on the surface of the alloy liquid is removed, and then it is formed by sand casting.

[0031]This embodiment also relates to a heat treatment method for the aforementioned Mg-3.0Zn-1.0RE-0.3Nd-0.4Zr magnesium alloy casting. 2 Insulate for 3 hours in a protective atmosphere, air-cool to room temperature, and then perform secondary aging treatment at 175 ° C, SO 2 Incubate under a protective atmosphere for 16 hours, then air cool to room temperature.

[0032] Traditional method: Mg-3.0Zn-1.0RE-0.3Nd-0.4Zr magnesium alloy castings are subjected to only one aging treatment at 300 °C, SO 2 Incubate under protective...

Embodiment 2

[0036] This embodiment relates to a kind of Mg-Zn-RE-Zr series magnesium alloy casting: Mg-4.2Zn-1.5RE-0.5Nd-0.7Zr (percentage by weight, wt.%) alloy is pressed correspondingly under flux or gas protection After the ingredients are melted, the temperature is raised to 780 ° C, and the temperature is kept for 20 minutes, and then the temperature is lowered to 730 ° C ~ 740 ° C, the scum on the surface of the alloy liquid is removed, and then it is formed by sand casting.

[0037] This embodiment also relates to a heat treatment method for the aforementioned Mg-4.2Zn-1.5RE-0.5Nd-0.7Zr magnesium alloy casting. 2 Insulate for 2 hours in a protective atmosphere, cool to room temperature in air, and then perform secondary aging treatment at 185°C, SO 2 Incubate under protective atmosphere for 14 hours, then air cool to room temperature.

[0038] Traditional method: Mg-4.2Zn-1.5RE-0.5Nd-0.7Zr magnesium alloy castings are subjected to only one aging treatment at 325 °C, SO 2 Insulat...

Embodiment 3

[0042] This embodiment relates to a kind of Mg-Zn-RE-Zr series magnesium alloy casting: Mg-5.5Zn-2.0RE-0.4Nd-0.6Zr (percentage by weight, wt.%) alloy is pressed according to corresponding After the ingredients are melted, the temperature is raised to 780 ° C, and the temperature is kept for 20 minutes, and then the temperature is lowered to 730 ° C ~ 740 ° C, the scum on the surface of the alloy liquid is removed, and then it is formed by sand casting.

[0043] image 3 It is the scanning electron microstructure map (SEM) of the as-cast Mg-5.5Zn-2.0RE-0.4Nd-0.6Zr alloy and the corresponding Nd element surface scan map, wherein, image 3 (a) is the SEM structure diagram of the as-cast Mg-5.5Zn-2.0RE-0.4Nd-0.6Zr alloy; image 3 (b) is a surface scan diagram of Nd element. from image 3 It can be seen that the Nd element is mainly distributed in the magnesium matrix, and there is no phenomenon of enrichment in the eutectic phase of the grain boundary, which indicates that all ...

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Abstract

The invention discloses an Mg-Zn-RE-Zr magnesium alloy and a thermal treatment method thereof. The magnesium alloy comprises the following components in percentage by weight: 3.0-6.0% of Zn, 0.5-2.5% of RE, 0.2-0.5% of Nd, 0.3-0.7% of Zr, less than or equal to 0.15% of impurities and the balance of Mg. The thermal treatment method comprises the steps of carrying out primary ageing treatment on a magnesium alloy casting, preserving the temperature in SO2 atmosphere and air cooling to the room temperature; and carrying out secondary ageing treatment, preserving the temperature in SO2 atmosphere and air cooling to the room temperature. According to the Mg-Zn-RE-Zr magnesium alloy and the thermal treatment method thereof, the solid solution strengthening effect of the alloy is enhanced through adding trace of Nd element, so that the bad influences such as crystal grain growth, oxidation combustion, age hardening capacity lack and the like of the magnesium alloy caused by high solid solution temperature can be avoided, precipitated phase with favorable morphology, small size and uniform distribution can be obtained at the same time, the mechanical property of the alloy can be remarkably improved, and the requirements of the aerospace and national defense and military fields can be satisfied.

Description

technical field [0001] The invention relates to a magnesium alloy in the field of metal structural materials and a heat treatment method thereof, in particular to a Mg-Zn-RE-Zr series magnesium alloy and a heat treatment method thereof. Background technique [0002] For the fields of aerospace and weaponry, structural weight reduction and structural load-bearing and functional integration are important development directions. The economic benefits and performance improvements brought about by material weight reduction are very significant. For example, the fuel cost savings brought about by the same weight reduction of commercial aircraft and automobiles is nearly 100 times that of the latter; Nearly 10 times of that, more importantly, the improvement of maneuverability can greatly improve its combat effectiveness and survivability. Magnesium alloy has the advantages of low density, high specific strength and specific stiffness, excellent shock resistance and good cutting p...

Claims

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Application Information

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IPC IPC(8): C22C23/04C22F1/06
Inventor 王颖东吴国华张亮刘文才庞松丁文江
Owner SHANGHAI JIAO TONG UNIV