Mg含量对Al-20Si合金显微组织及力学性能的影响
Effect of Mg Content on Microstructure and Mechanical Properties of Al-20Si Alloy
王松海1, 黄晓锋2, 冯 凯2
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作者单位：1. 中航工业集团 兰州飞行控制有限责任公司, 甘肃 兰州 730070; 2. 甘肃省有色金属新材料省部共建国家重点实验室, 甘肃 兰州 730050)
中文关键字：Mg； Al-20Si合金； 显微组织； 力学性能
英文关键字：Mg; Al-20Si alloy; microstructure; mechanical properties
中文摘要：通过光学显微镜、力学万能试验机、X射线衍射仪和扫描电镜分析了Mg含量对Al-20Si铝合金显微组织和力学性能的影响。结果表明：合金中主要有α-Al、共晶硅、初生硅和Mg2Si等相存在，随着Mg含量的增加初生硅数量逐渐减少，并且变得细小；抗拉强度逐渐增加，而伸长率呈先下降后上升的趋势，硬度与伸长率的变化趋势相反。
英文摘要：The microstructure and mechanical properties of Al-20Si alloys were investigated by optical microscope (OM), mechanical apparatus, X-Ray diffraction (XRD) and scanning electron microscope (SEM). The results indicate that the microstructure of the alloy mainly contains α-Al, eutectic silicon, primary silicon and Mg2Si. With the increase of Mg content, the primary silicon gradually decreases and refines; the tensile strength gradually increases; the elongation increases initially and then decreases, while the hardness has the contrary trend of the elongation.