Ti掺杂量对TZM合金组织和性能的影响

Effects of Ti Doping Amount on Microstructure and Properties of TZM Alloy

采用粉末冶金法制备了不同Ti掺杂量的TZM合金,通过SEM分析了合金的显微组织,并测定了合金的显微硬度。采用Gleeble—1500型热/力试验机模拟合金在高温下的受热及变形过程,绘制出应力-应变曲线。结果表明,随着Ti掺杂量的增加,Ti、Zr氧化物或单质于合金晶界处的富集越来越明显,起到强化合金的作用;合金的显微硬度随着Ti掺杂量的增加先增大后减小,并于TiH2含量为0.6%时达最大;合金的高温变形抗力随Ti掺杂量的增加而提高。

TZM alloys doped with different amount of Ti were prepared by powder metallurgy,their micro- structure is observed by SEM, and their microhardness was also measured. Gleeble 1500 thermal/mechanical testing machine was employed to simulate the heating and deformation process of the alloys at high temperature,and then stress-strain curves were drawn. The results show that higher Ti doping amount results in more and more obvious enrichment of Ti and Zr oxide or simple substance at the alloy grain boundaries to strengthen the alloy. The alloy microhardness increases first and then decreases with Ti doping amount increasing,and reaches a maximum with 0.6% TiH2 content. High temperature deformation resistance of the alloys is improved with higher Ti doping amount.