Ti－24Al－14Nb－3V－0．5Mo合金的超塑性  

SUPERPLASTICITY OF Ti-24Al-14Nb-3V-0.5Mo ALLOY

作　　者：王斌[1] 贾天聪[1] 王跃群[1] 邹敦叙[1] 仲增墉[1] 白秉哲[1] 杨鲁义[1] 

机构地区：[1]冶金工业部钢铁研究总院,机电工业部北京机电研究所

出　　处：《金属学报》1994年第7期B309-B313,共5页Acta Metallurgica Sinica

摘　　要：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 .

关 键 词：超塑性 细晶组织 TI3AL基合金 

分 类 号：TG113.253[金属学及工艺—物理冶金]