Effect of Y and Ce on the microstructure, mechanical properties and anisotropy of as-rolled Mg-8Li-1Al alloy

Feng Zhong¹，Huajie Wu¹，Ruizhi Wu^3,4，Jinghuai Zhang¹，Legan Hou¹，Milin Zhang¹

1. Key Laboratory of Superlight Material and Surface Technology(Harbin Engineering University), Ministry of Education3. Key Laboratory of Superlight Material and Surface Technology(Harbin Engineering University) Ministry of Education4. College of Science, Heihe University, Heihe University

摘 要：The effects of combined addition of Y and Ce on the microstructure, mechanical properties and anisotropy of as-rolled Mg-8 Li-1 Al（LA81） alloy were studied. The combined addition of Y and Ce improves the mechanical properties with a low plasticity loss by solution strengthening, dispersion strengthening,grain refinement strengthening. Mg-8 Li-1 Al-0.6 Y-0.6 Ce（LA81-0.6 Y-0.6 Ce） has better mechanical properties and shows an almost isotropy. It possesses an ultimate tensile strength of 278.7 MPa and an elongation of 15.0%. Compared to LA81 alloy, the ultimate tensile strength increases by about 17.6% with an elongation reduction of only 3.5%, and a good isotropy of ultimate tensile strength and elongation(the value of r_avg is near 1).

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