Microstructures and tensile properties of as-extruded Mg-Sn binary alloys
Microstructures and tensile properties of as-extruded Mg-Sn binary alloys
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DOI：
10.1016/s1003-6326(09)60298-3
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发表时间：
2010-07-01
影响因子：
4.5
通讯作者：
Qin Gao-wu
中科院分区：
文献类型：
--
作者：
Chen Dong;Ren Yu-ping;Qin Gao-wu
采用光学显微镜、扫描电镜和拉伸试验研究了300 ℃间接挤压Mg-xSn（x=3，7和14，质量分数，%）合金的显微组织和力学性能。α-Mg基体的晶粒尺寸从均匀化处理后的220、160和93 gm分别减小到挤压后的三种合金中的28、3和16 gm。结果表明，挤压态Mg-7Sn合金的晶粒细化最为显著。同时，Mg-7Sn合金中的Mg 2Sn颗粒的量显著增加，并且在α-Mg基体中非常均匀地分布。而Mg-14 Sn合金中，凝固过程中遗留下来的尺寸较大的Mg 2 Sn相主要沿沿着分布。室温拉伸试验表明，挤压态Mg-7Sn合金的抗拉强度最高，255 MPa，比铸态样品提高120%。
The microstructure and mechanical properties of Mg-xSn (x=3, 7 and 14, mass fraction, %) alloys extruded indirectly at 300 degrees C were investigated by means of optical microscopy, scanning electron microscopy and tensile test. The grain size of the alpha-Mg matrix decreases from 220, 160 and 93 gm after the homogenization treatment to 28, 3 and 16 gm in the three alloys after extrusion, respectively. The results show that the grain refinement is most remarkable in the as-extruded Mg-7Sn alloy. At the same time, the amount of the Mg2Sn particles remarkably increases in the Mg-7Sn alloy with very uniform distribution in the alpha-Mg matrix. In contrast, the Mg2Sn phase inherited from the solidification with a large size is mainly distributed along grain boundary in the Mg-14Sn alloy. The tensile tests at room temperature show that the ultimate tensile strength of the as-extruded Mg-7Sn alloy is the highest, i.e., 255 MPa, increased by 120% as compared with that of as-cast samples.