首页|铸态和固溶态Mg-8Li-xAl-yZn合金的显微组织与力学性能

铸态和固溶态Mg-8Li-xAl-yZn合金的显微组织与力学性能

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研究Al/Zn比(质量比)对Mg-8Li合金显微组织和力学性能的影响.结果发现,对于铸态Mg-8Li-xAl-yZn(x+y=5)合金,当Al/Zn比分别为1:4和2:3时,合金中的第二相主要为AlLi和MgLiZn相;而当Al/Zn比分别为3:2和4:1时,合金中的第二相主要为AlLi和MgLi2Al相.MgLiZn相的分解温度约为300℃,AlLi和MgLi2Al相的分解温度较高,约为350℃.固溶强化是提高Mg-8Li-xAl-yZn合金强度的主要因素,Mg-8Li-3Al-2Zn合金在350℃ 固溶处理4 h后具有最佳的综合力学性能,其屈服强度、抗拉强度和伸长率分别为272.5 MPa、315.0 MPa和3.4％.
Microstructure and mechanical properties of as-cast and solid solution treated Mg-8Li-xAl-yZn alloys
The effects of Al/Zn ratio (mass ratio) on microstructure and mechanical properties of the Mg-8Li alloy were investigated. The results indicate that in the as-cast Mg-8Li-xAl-yZn (x+y=5) alloys (LAZ alloys), when the Al/Zn ratio is 1:4 and 2:3, the secondary phases are mainly AlLi and MgLiZn phases; when the Al/Zn ratio is 3:2 and 4:1, the secondary phases are mainly AlLi and MgLi2Al phases. The decomposition temperature of MgLiZn phase is about 300 ℃ and the decomposition temperatures of AlLi phase and MgLi2Al phase are higher (～350 ℃). Solid solution strengthening is the main factor for the improvement of strength of Mg-8Li-xAl-yZn alloys. The Mg-8Li-3Al-2Zn alloy after solution treatment at 350 ℃ for 4 h has the best comprehensive mechanical properties (yield strength of 272.5 MPa, ultimate tensile strength of 315.0 MPa and elongation of 3.4％) among the studied as-cast and solid solution treated Mg-8Li-xAl-yZn alloys.

Mg-Li alloyAl/Zn ratiomicrostructuremechanical properties

梁新理、彭翔、冀浩、刘文才、吴国华、丁文江

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上海交通大学 材料科学与工程学院 轻合金精密成型国家工程研究中心,上海 200240

上海交通大学 材料科学与工程学院 金属基复合材料国家重点实验室,上海 200240

镁锂合金 Al/Zn比 显微组织 力学性能

authors are grateful for the financial supports from the National Natural Science Foundation of Chinaauthors are grateful for the financial supports from the National Natural Science Foundation of ChinaJoint Fund for Space Science and TechnologyChina and National Defense Science and Technology Innovation Special Zone Project

51771115517753346141B06310106002-002-01

2021

10.1016/S1003-6326(21)65550-4

中国有色金属学报(英文版)
中国有色金属学会

中国有色金属学报(英文版)

CSTPCDCSCDSCI
影响因子：1.183
ISSN：1003-6326
年,卷(期)：2021.31(4)
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