首页|Y对Mg?4Li?3Al合金显微组织演变及力学性能的影响

Y对Mg?4Li?3Al合金显微组织演变及力学性能的影响

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为制备轻质高性能镁合金,将稀土元素Y添加至Mg−4Li−3Al(质量分数,％)合金.采用金相显微镜、扫描电子显微镜及拉伸试验研究Y含量对于Mg−4Li−3Al合金显微组织演变与力学性能的影响.研究发现,铸态Mg−4Li−3Al合金的力学性能经挤压后得到显著提高.热挤压Mg−4Li−3Al−1.5Y合金的综合力学性能最优,抗拉强度为248 MPa、伸长率为27％.热挤压Mg−4Li−3Al−1.5Y合金的力学性能提升是晶粒细化、固溶强化和析出相强化协同作用的结果.
Effect of Y on microstructure evolution and mechanical properties of Mg−4Li−3Al alloys
To obtain magnesium alloys with a low density and improved mechanical properties, Y element was added into Mg−4Li−3Al (wt.％) alloys, and the effect of Y content on microstructure evolution and mechanical properties was investigated by using optical microscopy, scanning electron microscopy and tensile tests. The results show that mechanical properties of as-cast Mg−4Li−3Al alloys with Y addition are significantly improved as a result of hot extrusion. The best comprehensive mechanical properties are obtained in hot-extruded Mg−4Li−3Al−1.5Y alloy, which possesses high ultimate tensile strength (UTS=248 MPa) and elongation (δ=27％). The improvement of mechanical properties of hot-extruded Mg−4Li−3Al−1.5Y alloy was mainly attributed to combined effects of grain refinement, solid solution strengthening and precipitation strengthening.

Mg−Li−Al alloyY elementmicrostructureultimate tensile strengthelongation

常丽丽、郭晶、苏效婧

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山东大学 材料科学与工程学院,济南 250061

Mg−Li−Al合金 Y元素 显微组织 极限抗拉强度 伸长率

work was supported by the National Natural Science Foundation of ChinaPromoted Research Fund for Excellent Young and Middle-aged Scientists of Shandong Province,Chinapartially by the Fundamental Research Funds of Shandong University,China

51401115BS2013CL0342016JC016

2021

10.1016/S1003-6326(21)65757-6

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(12)
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