Release Time:2019-03-11  Hits:

Indexed by: Journal Article

Date of Publication: 2014-01-01

Journal: Mater Trans

Included Journals: EI

Volume: 66

Issue: 6

Page Number: 877-884

Abstract: Precipitation behavior of α phase in Ti-15Mo alloy during isothermal aging after straining by high-pressure torsion (HPT) was investigated and compared with that without HPT process. Upon isothermal aging, ultrafine equiaxed α phase particles and acicular α phase plates were obtained in HPT-processed samples, while only the coarse acicular α phase plates were obtained in the samples without HPT process. The precipitation of equiaxed α phase occurred faster than the precipitation of acicular α phase in HPT-processed samples. It seemed that a high density of dislocations resulted in highly strained area and enhanced atomic diffusivity, promoting the formation of equiaxed α phase. The HPTprocessed samples exhibited higher hardness and ultimate tensile strength but lower ductility than those of the specimens without HPT process. © 2014 The Japan Institute of Metals and Materials.