2012 Volume 53 Issue 8 Pages 1379-1384
A series of metastable β-type binary Ti–(18–22)V alloys were prepared to investigate the effect of deformation-induced products (deformation-induced ω phase transformation and mechanical twinning) on the mechanical properties of metastable β-type titanium alloys. The microstructures, Young’s moduli, and tensile properties of the alloys were systemically examined.
Ti–(18–20)V alloys subjected to solution treatment comprise a β phase and a small amount of athermal ω phase, while Ti–22V alloy subjected to solution treatment consists of a single β phase. Ti–(18–20)V alloys subjected to solution treatment exhibit relatively low Young’s moduli and low tensile strengths as compared to cold-rolled specimens. Both deformation-induced ω phase transformation and {332}β< 113 > β mechanical twinning occur in all of the alloys during cold rolling. The occurrences of {332}β< 113 > β mechanical twinning and deformation-induced ω phase transformation are dependent on the β stability of the alloys. After cold rolling, all of the alloys comprise a β phase and an ω phase. The Young’s moduli of Ti–(18–22)V alloys increase because of the formation of a deformation-induced ω phase during cold rolling. The significant increase in tensile strength is attributed to the combined effect of the deformation-induced ω phase transformation and work-hardening during cold rolling.
