TC11钛合金在疲劳－蠕变交互作用下的形变特征及位错结构

 研究了经常规,近β和β锻造工艺所获得的具有等轴、双态和网篮３种显微组织的ＴＣ１１钛合金在疲劳－蠕变交互作用下的形变特性及位错结构。发现不同显微组织或同一组织内部的初生α和条状α具有的层错能不同是形成不同位错亚结构的根本原因。

CYCLIC DEFORMATION AND DISLOCATION OF TC11 TITANIUM ALLOY UNDER FATIGUE-CREEP INTERACTION

The characteristics of cyclc deformation and dislocation of TC11 titanium with e-quiaxed,duplex and basketweaver microstructures are studied. It is found that different mi-crostructures have different dislocations and the curves of 1g ( 1/ε)-N of equiaxed and bas-ketweaver microstructures have a zigzag shape. Analyses show that the nature of microstructures’effect on the characteristics of deformation and dislocation of TC11 titanium al-loy under fatigue-creep interaction is that different microstructures or primary and platelet α phases in the same microstructure have different fault energy; the higher the fault energy,the easier the dislocation’s recovery, and that dislocation recovery and pile-up again at the same pro-cess make the curves of lg(1/ε)-N become zigzag.