【作者】 丁桦； 姜宏武； 王幼筠； 崔建忠； 万初杰； 白秉哲；

【Author】 Ding Hua Jiang Hongwu Wang Youjun Cui Jianzhong (Northeastern University) Wan Chujie Bai Bingzhe (Mechanical and Electrical Research Institute)

【机构】 东北大学； 机械部北京机电研究所；

【摘要】 本文对Ti-24Al-17Nb-1Mo合金的超塑压缩行为进行了研究,得到最佳超塑变形条件为980℃,3.37×10^-3s^-1,此条件下的m值为0.67。观察了合金超塑变形前后的组织,并对超塑变形机制进行了探讨。提出的变形机制为:在超塑变形过程中,合金中的条状硬相发生"破碎",并向等轴晶粒转化。硬相晶粒可在软相中滑动和转动,造成的应力集中可由软相中的位错运动松弛。更多还原

【Abstract】 The superplastic compressive behavior of Ti-24Al-17Nb-lMo Alloy was studied and the optimum superplastic deformation condition was 980℃,3.37×10^-3□s^-1,m being 0.67.The microstructure of the alloy before and after deformation was observed and superplastic behavior analyzed.In the superplastic deformation,the " brokening up" of hard lath-like grains occurred and transformed to equiaxed ones.Hard grains could slide and rotate in the soft phase and the stress concentration could be released by the dislocation movements in the soft phase.更多还原