本文選題：半固態(tài) + 機(jī)械攪拌　； 參考：《熱加工工藝》2016年23期

【摘要】：通過(guò)半固態(tài)機(jī)械攪拌制備出非樹(shù)枝狀初生相β-Sn的Sn-52Bi合金。通過(guò)金相組織觀察和拉伸試驗(yàn)研究了非樹(shù)枝晶狀初生相β-Sn對(duì)Sn-52Bi合金塑性的影響。結(jié)果表明:半固態(tài)機(jī)械攪拌工藝能細(xì)化合金的初生相β-Sn。隨著攪拌時(shí)間的延長(zhǎng),初生相β-Sn越來(lái)越細(xì)小,球化效果越來(lái)越好;細(xì)小球狀的β-Sn晶粒均勻分布在組織中,使原片狀出現(xiàn)的共晶相組織得到離散,間接細(xì)化了Bi晶粒。半固態(tài)機(jī)械攪拌后,合金塑性明顯提高,其中機(jī)械攪拌15 min制備的合金伸長(zhǎng)率最大,達(dá)到40.63%;與180℃普通吸鑄工藝相比,伸長(zhǎng)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，

本文編號(hào)：1829136