锡添加量对铸态Mg-3Al-0.5SiO_(2)合金显微组织和力学性能的影响  

Effect of Sn Addition Amount on Microstructure and Mechanical Properties of As-cast Mg-3Al-0.5SiO_(2)Alloy

作　　者：李彩霞[1] 幸世文 李超[1] 赵栖彤 LI Caixia;XING Shiwen;LI Chao;ZHAO Xitong(School of Materials Science and Chemical Engineering,Harbin University of Technology,Harbin 150040,China)

机构地区：[1]哈尔滨理工大学材料科学与化学工程学院,哈尔滨150040

出　　处：《机械工程材料》2023年第3期72-77,84,共7页Materials For Mechanical Engineering

基　　金：国家自然科学基金资助项目(51975167);黑龙江省普通高校基本科研业务费专项资金资助项目(2019-KYYWF-0220)。

摘　　要：以纯镁锭、纯铝锭、纯锡锭、纳米SiO_(2)粉末为原料熔炼铸造Mg-3Al-0.5SiO_(2)-xSn(x=0,1,3,5,7,10,质量分数/%)合金,研究了锡添加量对合金显微组织和力学性能的影响。结果表明:随着锡添加量的增加,粗大的Mg_(2)Si初生相逐渐转变为块状或针状相,Mg_(2)Sn相含量增加,当锡质量分数为5%时,Mg_(2)Sn相分布最均匀,尺寸最小;合金的强度和断后伸长率均随着锡添加量的增加呈先升高后降低的趋势,断裂方式先由脆性断裂向韧性断裂转变,再向脆性断裂转变;当锡质量分数为5%时,合金具有最佳的室温拉伸性能,其抗拉强度、屈服强度、断后伸长率分别为145.6 MPa,98.7 MPa,7.12%,断裂方式为韧性断裂。Mg-3Al-0.5SiO_(2)-xSn(x=0,1,3,5,7,10,mass fraction/%)alloys were melted and casted by taking pure magnesium ingot,pure aluminum ingot,pure tin ingot and nano-SiO_(2)powder as raw materials.The effects of Sn addition amount on the microstructure and mechanical properties of the alloys were studied.The results show that with increasing Sn addition amount,the coarse primary Mg_(2)Si phase gradually transformed into granular or acicular phase,and the Mg_(2)Sn phase content increased.When the mass fraction of Sn was 5%,Mg_(2)Sn phase had the most uniform distribution and the smallest size.The strength and precentage elongation after fracture of the alloy increased and then decreased with the increase of Sn addition amount,and the fracture mode changed from brittle fracture to ductile fracture and then to brittle fracture.When the Sn mass fraction was 5%,the alloy had the best tensile properties at room temperature with the tensile strength,yield strength and precentage elongation after fracture of 145.6 MPa,98.7 MPa and 7.12%,respectively,and the fracture mode was brittle fracture.

关 键 词：Mg-3Al-0.5SiO_(2)合金 锡添加 显微组织 拉伸性能 

分 类 号：TG146.2[一般工业技术—材料科学与工程]