用金相显微镜、扫描电镜及能谱、透射电子显微镜以及万能拉伸试验机等研究了Sr/Al质量比对Mg-Al-Sr合金显微组织及力学性能的影响.结果表明该合金的相组成随Sr/Al值而变化.合金中主要的第二相包括Al4Sr和Al2Sr,但在不同的合金中存在的数量,形态都不同.而且在175℃时合金的力学性能也随Sr/Al值的变化而变化.当该比值取0.25时合金的抗拉强度值达到峰值.
The effect of the Sr/Al mass ratio on the microstructure and properties of Mg-Al-Sr alloys was studied using optical microscopy,scanning electron microscopy and energy dispersive spectroscopy,transmission electron microscopy,and a universal tensile testing machine.The results show that the constituents of the alloys vary with the St/Al mass ratio.The major second phase includes Al4Sr and Al2Sr,but the amount and morphology of these compounds are different in the alloys.Moreover,the mechanical properties of the alloys at 175 ℃ vary with the ratio.The tensile strength of the alloys reaches a maximum when the ratio is 0.25.
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