Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报(英文版)

Transactions of Nonferrous Metals Society of China

Vol. 31    No. 12    December 2021

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Effect of Y on microstructure evolution and mechanical properties of Mg-4Li-3Al alloys
Li-li CHANG, Jing GUO, Xiao-jing SU

School of Materials Science and Engineering, Shandong University, Ji’nan 250061, China

Abstract: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.

 

Key words: Mg-Li-Al alloy; Y element; microstructure; ultimate tensile strength; elongation

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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