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High-strength wrought magnesium alloy and preparation method thereof

A deformed magnesium alloy, high-strength technology, applied in the field of light metal materials, can solve the problems of high cost and insufficient strength, and achieve the effect of increasing strength, improving mechanical properties, and enhancing the effect of precipitation strengthening

Active Publication Date: 2016-01-06
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] Aiming at the problems of insufficient strength or high cost of existing wrought magnesium alloys, the present invention provides a high-strength wrought magnesium alloy and a preparation method thereof. The same strengthening effect of rare earth, completely replace or reduce the content of rare earth, reduce the cost of the alloy while ensuring the strength

Method used

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  • High-strength wrought magnesium alloy and preparation method thereof
  • High-strength wrought magnesium alloy and preparation method thereof
  • High-strength wrought magnesium alloy and preparation method thereof

Examples

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Effect test

Embodiment 1

[0027] A cube ingot with a side length of 200 mm and a height of 150 mm was obtained by metal mold gravity casting. After chemical analysis, its chemical composition is: Mg-2.0Zn-0.8Gd-0.7Ca-0.5Mn. Its as-cast structure is as figure 1 As shown in (a), the as-cast grain size is 50-100 microns.

[0028] The alloy ingot was subjected to homogenization treatment at 420° C. for 16 hours; after treatment, it was cut into billets for extrusion with a diameter of 50 mm. The billet for extrusion was kept at 380° C. for 2 hours, put into an extrusion cylinder for extrusion, and an extruded rod with a diameter of 12 mm was obtained. The microstructure of the extruded rod is as figure 1 (b); After extrusion, the grains are refined to 2-5 microns. According to the Hall-Petch relationship, the grain refinement will increase the strength of the alloy. The mechanical properties were tested according to the national standard GB / T228-2002. The tensile strength was 418MPa, the yield strength...

Embodiment 2

[0030] A cube ingot with a side length of 200 mm and a height of 150 mm was obtained by metal mold gravity casting. After chemical analysis, its chemical composition is: Mg-3.0Zn-0.2Gd-2.0Ca-0.2Mn-0.3Zr. Its as-cast structure is as figure 2 As shown in (a), the as-cast grain size is 50-100 microns, due to the increase of Zn content, dendrites are formed, and more second phases are produced.

[0031]The alloy ingot was subjected to homogenization treatment at 400°C for 12 hours; after treatment, it was cut into billets for extrusion with a diameter of 50 mm. The billet for extrusion was kept at 380° C. for 2 hours, put into an extrusion cylinder for extrusion, and an extruded rod with a diameter of 12 mm was obtained. The microstructure of the extruded rod is as figure 2 (b); After extrusion, the grains are refined to 1-5 microns, and a lot of fine particle precipitates are produced, and the grain refinement and precipitation strengthening further improve the strength. Th...

Embodiment 3

[0033] A cube ingot with a side length of 200 mm and a height of 150 mm was obtained by metal mold gravity casting. After chemical analysis, its chemical composition is: Mg-4.1Zn-3Y-0.2Ca-2.0Mn. Its as-cast structure is as image 3 As shown in (a), the as-cast grain size is 50-100 microns, and due to the continuous increase of Zn content, the number of dendrites is more, and the number of second phases also increases.

[0034] The alloy ingot was subjected to homogenization treatment at 380° C. for 12 hours; after treatment, it was cut into billets for extrusion with a diameter of 50 mm. The billet for extrusion was kept at 380° C. for 2 hours, put into an extrusion cylinder for extrusion, and an extruded rod with a diameter of 12 mm was obtained. The microstructure of the extruded rod is as image 3 (b); After extrusion, the grains are refined to 1-5 microns, and a lot of fine grain precipitates are produced, and there are also some coarse second phases. The grain refineme...

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Abstract

The invention discloses high-strength wrought magnesium alloy and a preparation method thereof and belongs to the technical field of light metal materials. The high-strength wrought magnesium alloy comprises the following components in percentage by weight: 2.0-6.5% of Zn, 0.1-3.0% of RE, 0.1-2.0% of Ca and the balance of Mg and inevitable impurities; the high-strength wrought magnesium alloy also can comprise grain refiners Mn and / or Zr. Zn is a main strengthening element in the alloy, and can improve the room temperature strength of magnesium alloy through solid solution strengthening and aging precipitation strengthening; Ca is used for promoting precipitation, refining grains and improving high-temperature strength of alloy; and a small amount of RE is used for restraining recrystallization, refining deformed alloy grains, regulating texture and improving plasticity of alloy. According to the invention, by replacing expensive rare earth elements with cheap common alloying elements, a strengthening effect similar to that of rare earth is generated, the rare earth content is completely replaced or lowered and the cost of alloy is reduced while strength is guaranteed.

Description

technical field [0001] The invention relates to the technical field of light metal materials, in particular to a high-strength deformed magnesium alloy and a preparation method thereof. Background technique [0002] As a new type of lightweight metal material, magnesium alloy has a series of advantages such as low density, high specific strength, impact resistance, and recyclability, and has broad application prospects. Especially with the rapid development of transportation fields such as aviation and high-speed rail and military fields such as aerospace, the demand for high-strength wrought magnesium alloys is becoming increasingly urgent. [0003] At present, there are only AZ80 (Mg-8Al-0.4Zn) and ZK60 (Mg-6Zn-0.5Zr) commercial high-strength wrought magnesium alloys. Their tensile strength after deformation + aging heat treatment is about 300-350MPa, and the elongation at room temperature is 8%. At present, the tensile strength of aluminum alloys used as structural part...

Claims

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Application Information

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IPC IPC(8): C22C23/00C22C23/04C22C23/06
Inventor 陈荣石闫宏柯伟
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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