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通过光学显微金相、扫描电镜和力学性能测试等手段,研究了Sn添加量为3wt%、5wt%、8wt%和10wt%的铸态和连续挤镦态的Mg-Sn二元合金的显微组织与力学性能。结果表明,Sn含量≤8wt%时,Mg-Sn二元合金的组织被细化。铸态的Mg-Sn合金经连续挤镦后,晶粒得到明显细化。同时,Mg2Sn相含量随锡含量的升高而增加;连续挤镦的Mg-8wt%Sn合金组织抗拉强度最大,达到204 MPa,比相应的铸态组织增加67%;连续挤镦变形合金的拉伸断口出现大量韧窝,断裂方式为典型韧性断裂。
By means of optical microstructure, scanning electron microscopy and mechanical properties testing, the effects of the addition of 3wt%, 5wt%, 8wt% and 10wt% Sn on the as-cast and as-extruded Mg-Sn binary alloys Micro-organization and mechanical properties. The results show that the microstructure of Mg-Sn binary alloy is refined when the Sn content is less than or equal to 8wt%. As-cast Mg-Sn alloy after extrusion by extrusion, the grain was significantly refined. At the same time, the content of Mg2Sn phase increased with the increase of tin content. The tensile strength of the as-extruded Mg-8wt% Sn alloy was the highest, reaching 204 MPa, which was 67% higher than the corresponding as-cast microstructure. A large number of dimples appear in the tensile fracture, and the fracture mode is typical ductile fracture.