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中文摘要：
采用普通铸造法制备了Mg-3Al-x Sr（x=0.1~0.9,质量分数,%）系列合金。利用金相显微镜、XRD、SEM、电导率测量仪和显微硬度仪等手段对该系列合金的金相组织、显微结构、电导率及维氏显微硬度等性能进行了测试。结果表明,在Mg-3Al合金中添加少量Sr元素（〈0.1%）会生成Al4Sr相,而继续增加Sr后（〉0.1%）合金中开始出现Mg-Al-Sr相（τ相）,Mg-Al-Sr铸态合金的电导率因此随着Sr含量的增加而不断提高;经高温热处理后（400℃）,热处理态Mg-Al-Sr合金的电导率均随着热处理时间的延长而不断增加,这主要是由τ相逐渐分解并转变为Al4Sr相引起的;添加少量的Sr（〈0.1%）会降低Mg-3Al合金的显微硬度,而随着Sr元素的继续添加（〉0.1%）,合金的显微硬度先增大后减小,并在Sr含量达到0.6%时达到峰值;此外,高温热处理会降低Mg-Al-Sr铸态合金的显微硬度。
英文摘要：
Mg-3Al-x Sr（x=0.1~0.9 wt%） alloys were prepared by a traditional cast method. Microstructures, electrical conductivities and micro-hardness of the present alloys in as-cast and as-heat treated states were studied by means of optical microscope, SEM, XRD,electrical conductivity meter and micro-hardness measuring instruments. The results show that Al4 Sr phase is formed with little addition of Sr（0.1 wt%）. With increasing content of Sr, the electrical conductivity of as-cast Mg-Al-Sr alloys increases, and Mg-Al-Sr ternary phase（τ phase） is formed. After high temperature heat treatment at 400 oC, τ phase would decompose to Al4 Sr phase, and the corresponding electrical conductivity of Mg-Al-Sr alloys increases with the heating time increasing. Vickers hardness of the as-cast alloy decreases slightly with a small amount of Sr addition（0.1 wt%）. With the increasing content of Sr（0.1 wt%）, the hardness of the alloys increases first, reaching the peak hardness at 0.6 wt% Sr and then decreases. Moreover, the high temperature treatment would decrease the corresponding hardness for as-cast alloys.
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