Sn对Mg-6Zn合金显微组织及力学性能的影响

Effect of Sn on Microstructure and Mechanical Properties of Mg-6Zn Alloy

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 effects of Sn on the microstructure and mechanical properties of Mg-6Zn alloy were studied. By optical microscope, scanning electron microscopy, energy spectrum analyzer, universal testing machine, etc, the microstructure and mechanical properties of Mg-6Zn alloy were analyzed. The results show that the addition of Sn into the magnesium alloy can effectively improve the ingot microstructure and then Mg2Sn particles appear. With a small amount of Sn addition, the strength, elongation and hardness of Mg-6Zn as-cast alloy increase with the increase of Sn content. When the content of Sn is 1%, the strength, elongation and the hardness of Mg-6Zn alloy is the highest. When Mg-6Zn is added with small amount of Sn, the local area shows ductile fracture. When the content of Sn exceeds 1.5%, the local area is characterized by intergranular fracture.