Effect of High-pressure Torsion Deformation on Isothermal ω Phase in β-Ti Alloys

摘要：

In the present investigation,the effect of highpressure torsion (HPT) deformation on the microstructures and mechanical properties of β-Ti alloys containing isothermal omega phase was studied. X-ray diffractometry results indicated the intensity of omega peaks was the highest after the application of compressive stress. The subsequent torsional straining led to a pronounced decrease in the omega peak intensity. Optical microscope observations of the cross-section on the HPT discs revealed that numerous shear bands forms by HPT deformation. The density and thickness of the shear bands increased with increasing strain. White etching layer (WED appeared after 1 turn of HPT deformation and the WEL thickness increased with number of rotation. Microhardness measurements revealed that the hardness is lower inside the WEL (about 400 Hv) than the outside (about 460 Hv). The results suggest the decomposition of omega phase to β phase.

关键词： β-titanium (β-Ti,high-pressure torsion (HPT) omega(ω) phase body centered cubic (bcc) shear bands

作者: K. Tsuchiya S. Farjami B. Jiang X. Min S. Emura S. Ii

作者单位: National Institute for Materials Science,Tsukuba 305-0047,Japan University of Tsukuba,Tsukuba 305-85 GE Aviation,Cincinnati,OH,U. S. A. National Institute for Materials Science,Tsukuba 305-0047,Japan

会议类型: 国际会议

会议名称: The 12th World Conference Titanium(第十二届世界钛会 Ti-2011)

会议地点: 北京

会议语种:英文

页码: 584-587

在线出版日期: 2011-06-19（万方平台首次上网日期，不代表论文的发表时间）