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研究了Sn对Mg-6Zn合金显微组织及力学性能的影响。采用光学显微镜、扫描电镜、能谱分析仪、万能试验机等,对Mg-6Zn(x Sn)合金显微组织及力学性能进行分析。结果表明:镁合金中加入Sn可有效改善铸锭组织,形成的Mg2Sn颗粒。少量添加Sn元素,Mg-6Zn铸态合金的强度、伸长率及硬度随Sn含量增加而提高;Sn含量为1.0%时,Mg-6Zn铸态合金强度、伸长率和硬度达到最高。Mg-6Zn铸态合金添加少量Sn,局部区域呈现韧性断裂;Sn含量超过1.5%时,局部区域出现沿晶断裂的特征。
The effect of Sn on the microstructure and mechanical properties of Mg-6Zn alloy was studied. The microstructure and mechanical properties of Mg-6Zn (x Sn) alloy were analyzed by optical microscopy, scanning electron microscopy, energy dispersive spectroscopy and universal testing machine. The results show that the addition of Sn to the magnesium alloy can effectively improve the microstructure of ingot and the formation of Mg2Sn particles. The strength, elongation and hardness of Mg-6Zn as-cast alloy increased with the increase of Sn content with a small amount of addition of Sn. When the content of Sn was 1.0%, the strength, elongation and hardness of Mg-6Zn as-cast alloy reached the highest. A small amount of Sn is added to the as-cast Mg-6Zn alloy, and the ductile fracture appears in the local area. When the Sn content exceeds 1.5%, the intergranular fracture occurs in the local area.