论文部分内容阅读
根据4Mg+SiO2=Mg2Si+2MgO,利用高纯度石英砂与Mg液反应,采用普通凝固方法制备Mg-Si二元中间合金。利用Mg-Si中间合金、99.9%Mg和99.9%Sn制备Mg-Sn-Si三元合金,通过调整Si的含量研究Mg-5Sn-xSi系合金的组织和性能。利用光学显微金相定量分析、XRD分析,以及显微硬度测试,研究添加0~10%Si铸态Mg-Sn-Si合金的显微组织与力学性能。实验结果表明,Mg-Sn-Si合金主要由-αMg、Mg2Sn和Mg2Si 3相组成,无Mg-Sn-Si三元相。当Si≤6%时,合金显微硬度随Si含量的增加而增加。当Si含量≥6%时,合金显微硬度随Si含量的增加而降低。
According to 4Mg + SiO2 = Mg2Si + 2MgO, using high purity quartz sand and Mg liquid reaction, the use of ordinary solidification method prepared Mg-Si binary master alloy. Mg-Sn-Si ternary alloy was prepared by using Mg-Si master alloy, 99.9% Mg and 99.9% Sn, and the microstructure and properties of Mg-5Sn-xSi alloy were studied by adjusting the content of Si. The microstructure and mechanical properties of the as-cast Mg-Sn-Si alloy with 0% to 10% Si were investigated by means of optical microstructure quantitative analysis, XRD analysis and microhardness test. The experimental results show that the Mg-Sn-Si alloy is mainly composed of -αMg, Mg2Sn and Mg2Si 3 phases without Mg-Sn-Si ternary phase. When Si≤6%, the microhardness of the alloy increases with the increase of Si content. When the Si content ≥6%, the microhardness of the alloy decreases with the increase of Si content.