添加合金化元素对铸态Mg-Sn-Ca合金的 显微组织和力学性能的影响

来源期刊:中国有色金属学报(英文版)2013年第12期

论文作者:K. SURESH K.P. RAO Y.V.R.K. PRASAD N. HORT K.U. KAINER

文章页码:3604 - 3610

关键词:Sn/Ca质量比;Mg-Sn-Ca合金;合金化元素;显微组织;压缩强度

Key words:Sn/Ca ratio; Mg-Sn-Ca alloys; alloying additions; microstructure, compressive strength

摘    要:在铸态Mg-Sn-Ca (TX系列)合金中添加不同含量的Sn、Ca、Al、Si和Zn等合金化元素,研究其在25~250 °C温度范围内的压缩强度和显微组织变化。当合金中Sn/Ca质量比到达2.5时,在晶界处有Mg2Ca相生成;而当Sn/Ca质量比为3时,合金基体中只有CaMgSn相存在。当Sn/Ca质量比在2.5以上时,合金的压缩强度随着温度的升高而降低,在100~1750 °C保持基本不变,这主要是由于生成的Mg2Ca相的强化作用所致。然而,当Sn/Ca质量比为3时,合金的强度较低,且随着温度的升高而下降更快。在这些合金中,Mg-3Sn-2Ca合金的强度最高。向其中添加0.4%Al会导致其强度增加,然而同时添加Si会导致强度下降。同样地,添加Zn也能够提高合金的强度,而同时添加Al会导致强度下降。导致合金强度变化的原因与合金中生成的各种金属间化合物有关。

Abstract: The effect of Sn, Ca, Al, Si and Zn addition on the compressive strength of cast Mg-Sn-Ca (TX) alloys was studied in the temperature range of 25-250 °C and correlated with the microstructure. The Sn to Ca mass ratio up to 2.5 contributes to the formation of Mg2Ca phase at the grain boundaries and CaMgSn in the matrix, while a ratio of 3 gives only CaMgSn phase mostly in the matrix. While the compressive strength decreases with the increase in temperature, for Sn/Ca up to 2.5, a plateau occurs in 100-175 °C, which is attributed to the strengthening by Mg2Ca. However, for ratio of 3, the strength is lower and decreases more gradually. Mg-3Sn-2Ca (TX32) has the highest strength and the addition of 0.4% Al increases its strength but simultaneous addition of Si lowers the strength. Likewise, the addition of Zn improves its strength but simultaneous addition of Al slightly decreases the strength. The results are correlated with the types of intermetallic phases that form in various alloys.

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