Effects of calcium addition on as-cast microstructure andmechanical properties of Mg-5Zn-5Sn alloy

来源期刊：中国有色金属学报(英文版)2010年第5期

论文作者：杨明波 程亮 潘复生

文章页码：768 - 775

Key words：magnesium alloy; Mg-5Zn-5Sn alloy; microstructure and properties; Ca addition

Abstract: The effects of Ca addition on the as-cast microstructure and mechanical properties of the Mg-5Zn-5Sn (mass fraction, %) alloy were investigated. The results indicate that an addition of 0.5%-1.5% (mass fraction) Ca to the Mg-5Zn-5Sn alloy not only refines the as-cast microstructure of the alloy but also causes the formation of the primary and/or eutectic CaMgSn phases with high thermal stability; an increase in Ca amount from 0.5% to 1.5% (mass fraction) increases the amount and size of the CaMgSn phase. In addition, Ca addition to the Mg-5Zn-5Sn alloy improves not only the tensile properties at room temperature and 150 ℃ but also the creep properties. Among the Ca-containing Mg-5Zn-5Sn alloys, the one added 0.5% (mass fraction) Ca obtains the optimum ultimate tensile strength and elongation at room temperature and 150 ℃, however, the alloy added 1.5% (mass fraction) Ca exhibits the optimum yield strength and creep properties.

基金信息：supported by the National Natural Science Foundation of China
supported by the National Basic Research Program of China
supported by Chongqing Science and Technology Commission, China