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制备了不同Y含量的Mg-5Al-1Sr-2Ca-xY(x=0,1,2,5)合金试样,采用光学显微镜(OM)、扫描电子显微镜(SEM)、X射线衍射仪(XRD)、材料试验机等观察测试合金的微观组织和力学性能。结果表明,未添加Y时,合金晶粒大小不均匀,且多呈柱状,晶内有较多的点状化合物;Y含量1%时,晶粒细化、球化且大小较均匀;Y含量2%时,晶粒趋于柱状;Y含量5%时,晶粒形状不规则、大小极不均匀。随Y含量的增加,室温和高温力学性能呈先升后降趋势,最高点为Y含量1%,其室温和高温抗拉强度分别较无Y合金提高了约33.8%和25.4%。
The samples of Mg-5Al-1Sr-2Ca-xY (x = 0,1,2,5) with different content of Y were prepared and characterized by optical microscope (OM), scanning electron microscopy (SEM), X-ray diffractometer ), Material testing machine observed the microstructure and mechanical properties of the test alloy. The results show that when Y is added, the grain size of the alloy is not uniform, and the grains are mostly columnar with more dot-like compounds. When Y content is 1%, the grains are refined and spheroidized, and the Y content 2%, the grains tend to columnar; Y content of 5%, the grain shape is irregular, the size is extremely uneven. With the increase of Y content, the mechanical properties at room temperature and high temperature first and then decrease, the highest point is Y content of 1%, its tensile strength at room temperature and high temperature are respectively increased by 33.8% and 25.4% compared with those without Y alloy.