非树枝状初生相对Sn-52Bi合金塑性的影响

发布时间：2018-05-01 11:21

  本文选题：半固态 + 机械搅拌　； 参考：《热加工工艺》2016年23期

【摘要】：通过半固态机械搅拌制备出非树枝状初生相β-Sn的Sn-52Bi合金。通过金相组织观察和拉伸试验研究了非树枝晶状初生相β-Sn对Sn-52Bi合金塑性的影响。结果表明:半固态机械搅拌工艺能细化合金的初生相β-Sn。随着搅拌时间的延长,初生相β-Sn越来越细小,球化效果越来越好;细小球状的β-Sn晶粒均匀分布在组织中,使原片状出现的共晶相组织得到离散,间接细化了Bi晶粒。半固态机械搅拌后,合金塑性明显提高,其中机械搅拌15 min制备的合金伸长率最大,达到40.63%;与180℃普通吸铸工艺相比,伸长率提高了125.7%。
[Abstract]:A non dendritic 尾 -Sn Sn-52Bi alloy was prepared by semi solid mechanical stirring. The effect of 尾 -Sn on the plasticity of Sn-52Bi alloy was studied by metallographic observation and tensile test. The results show that the semi-solid mechanical stirring process can refine the primary phase 尾 -Snn of the alloy. With the prolongation of agitation time, the primary phase 尾 -Sn becomes smaller and finer, and the spheroidizing effect is better and better, and the fine spherical 尾 -Sn grains distribute uniformly in the microstructure, which makes the eutectic phase in the original flake form discrete and the Bi grain is refined indirectly. After semi-solid mechanical stirring, the plasticity of the alloy was obviously improved, and the elongation of the alloy prepared by mechanical stirring for 15 min was the largest, reaching 40.63, which was 125.7% higher than that of the ordinary suction casting process at 180 鈩，

本文编号：1829136