Effect of High-Pressure Torsion Process on Precipitation Behavior of α Phase in β-Type Ti-15Mo Alloy

被引：23
|
作者：
Jiang, Baozhen [1 ,2 ]
Tsuchiya, Koichi [1 ,2 ]
Emura, Satoshi [1 ]
Min, Xiaohua [1 ]
机构：
[1] Natl Inst Mat Sci, Struct Mat Unit, Tsukuba, Ibaraki 3050047, Japan
[2] Univ Tsukuba, Grad Sch Pure & Appl Sci, Tsukuba, Ibaraki 3058577, Japan
来源：
MATERIALS TRANSACTIONS | 2014年 / 55卷 / 06期
关键词：
beta titanium alloys; high-pressure torsion; alpha phase precipitates; time-temperature-transformation diagram; mechanical properties; SEVERE PLASTIC-DEFORMATION; TITANIUM-ALLOYS; HETEROGENEOUS NUCLEATION; DUPLEX STRUCTURE; OMEGA PHASE; MO; TI-15V-3CR-3SN-3AL; TRANSFORMATION; METALS; GROWTH;
D O I：
10.2320/matertrans.M2013469
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Precipitation behavior of a 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 a phase particles and acicular a phase plates were obtained in HPT-processed samples, while only the coarse acicular a phase plates were obtained in the samples without HPT process. The precipitation of equiaxed a phase occurred faster than the precipitation of acicular a 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 a phase. The HPT-processed samples exhibited higher hardness and ultimate tensile strength but lower ductility than those of the specimens without HPT process.
引用
收藏
页码：877 / 884
页数：8
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