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%。
Sn-52Bi alloy with non-dendritic primary phase β-Sn was prepared by semi-solid mechanical stirring. The effect of non-dendritic primary phase β-Sn on plasticity of Sn-52Bi alloy was studied by observation of metallurgical structure and tensile test. The results show that the primary phase β-Sn can be refined by semi-solid mechanical stirring. With the increase of stirring time, the primary phase β-Sn is getting smaller, and the effect of spheroidizing is getting better. The small and globular β-Sn grains are uniformly distributed in the microstructure, which make the original lamellar eutectic phase dispersed, and the grain size of Bi is also refined. After semi-solid mechanical stirring, the plasticity of the alloy is obviously improved. The elongation of the alloy prepared by 15 min mechanical stirring is the largest, reaching 40.63%. Compared with the ordinary casting at 180℃, the elongation increases by 125.7%.
出处
《热加工工艺》
CSCD
北大核心
2016年第23期67-69,73,共4页
Hot Working Technology
基金
国家自然科学基金赞助项目(51104049)
2014大学生创新创业训练项目(xj20141845083)
关键词
半固态
机械搅拌
非树枝晶
塑性
semi-solid
mechanical stirring
non-dendritic structure
plasticity
