Sr, Y对AZ31镁合金显微组织与力学性能的影响
Effects of Sr，Y on Microstructure and Mechanical Properities of AZ31 Alloy
谢卫东1,2, 宁 旭1, 王春光1, 彭晓东1,2
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作者单位：(1. 重庆大学 材料科学与工程学院, 重庆 400045; 2. 国家镁合金材料工程技术研究中心, 重庆 400044)
中文关键字：锶； 钇； 晶粒细化； 力学性能
英文关键字：stronisum; yttrium; grain refinement; mechanical properties
中文摘要：用金属型铸造法制备了不同Sr、Y含量的AZ31镁合金试样，借助光学显微镜、扫描电镜、能谱分析、XRD、力学性能测试等方法研究了Sr、Y对AZ31镁合金显微组织和力学性能的影响。结果表明，微量Sr的添加可细化AZ31镁合金的显微组织，并且在晶界处有杆状的Al4Sr形成；微量的Sr、 Y复合添加可使AZ31镁合金显微组织更加细化，晶内有颗粒状的Al2Y析出，同时β-Mg17Al12相消失；合金的常温和高温力学性能随Sr、Y的添加有明显提高。
英文摘要：The effects of Sr, Y on the microstructure and mechanical properties of metal mold casting AZ31 alloy were investigated by OM, SEM, EDS, XRD and tensile testing. The results show that the grain of AZ31 alloy can be refined by adding a small amount of Sr and a rod-like phase forms along the grain boundaries. While adding slight Y and Sr into AZ31 alloy, the size of α-Mg grain dramaticlly decreases, Al2Y phase precipitates in the grain and β-Mg17Al12 disappears. With the addition of Sr and Y, the tensile strength at ambient and high temperature obviously enhances.