(1. 北京工业大学 材料科学与工程学院，北京 100124；
2. 西北有色金属研究院，西安 710016)
摘 要: 采用扫描电镜和透射电镜分析近β型Ti-1300钛合金在初始锻造态、固溶+淬火态(β和α+β固溶态)以及固溶+时效态下的显微组织变化。结果表明：锻造态合金中初生α相内部发生孪生切变行为，基体β相晶内发生β→α相变。合金经过α+β固溶淬火处理，残留的初生α相中仍然可观察到细小孪生α相。孪生α相有两种不同变体(α1和α2)，互成60°生长方向，而且与基体α相也成60°的孪生关系，其间的晶体学取向关系为：{1120}α, twinning//{1120}α，á0001？α, twinning //á1101？α。Ti-1300钛合金与大多数近β型钛合金的时效特征相类似。
关键字: Ti-1300合金；显微组织；相变；时效特征
（1. College of Material Science and Engineering, Beijing University of Technology, Beijing 100124, China;
2. Northwest Institute for Nonferrous Metal Research, Xi’an 710016, China）
Abstract:The microstructure changes of near β Ti-1300 alloy, including the originally forged sample, the solution treated and the quenched sample (β and (α+β) solid solution state) and solution treated and aged sample, were investigated in detailly by SEM and TEM. The results show that, in the as-forged alloy, the twinning deformation behavior occurs in the primary α phase, the β→α phase transformation also occurs in the base β phase. During the (α+β)-solutionized condition of the forged samples, the twinning α phase is still found in the residual α phase. The twinning α phase has two different variants (α1 and α2), the α1 variant is rotated about 60° with respect to α2 variant, and the two variants have 60° angle twinning relationship with the base α phase, the orientation relationship can be described as follows:{1120}α, twinning//{1120}α, á0001？α, twinning //á1101？α. The aging characteristics of Ti-1300 alloy are similar to the other near β titanium.
Key words: Ti-1300 alloy; microstructure; phase transformation; aging characteristic
