研究了温度及应变速率对Ｔｉ－２４Ａｌ－１４Ｎｂ－３Ｖ－０．５Ｍｏ（ａｔ．－％）合金超塑性能的影响．试验结果表明，在９８０℃，３．５×１０~（－４）ｓ~（－１）的最佳超塑变形条件下，合金显示出较高的超塑性；应变速率敏感性指数ｍ为０．６９，拉伸延伸率Ｅｌ．为８１８％．根据其细小的α_２＋β_０两相组织和等温拉伸的试验方法，确定合金的超塑性属于细晶组织超塑性．在超塑变形过程中，合金无空洞产生，显微组织发生动态粗化．
Effect of temperature and strain rate on superplasticity of Ti-24Al-14Nb-3V-0.5Mo alloy has been studied. Under the optimal condition of 980℃ and 3.5 ×10~(-4)s~(-1), the maximum values of the strain rate sensitivity index, m, and tensile elongation are 0.69 and 818% respectively. A fine equiaxed α_2+β_0 duplex structure was observed in the superplastically deformed alloy. Together with the behaviour of alloy under isothermal tension test,it is believed that the alloy is of the fine-grained structural superplasticity. During superplastical deformation. no cavitation was found, but dynamic coarsening of the microstructure occurred .
参考文献
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