Improvement in Fatigue Strength with Maintaining Youngs Modulus Low by Controlling co-phase Precipitation in β-type Ti-Nb-Ta-Zr Alloy
In order to improve the fatigue strength with maintaining low Youngs modulus of a biomedical (Hype titanium alloy,Ti-29Nb-13Ta-4. 6Zr,a short-time aging combined with severe cold rolling was investigated. An ω phase was employed for precipitation strengthening. Because the rolling texture of β phase is formed by the cold rolling,such the ω phase may be preferentially oriented to a direction that is effective for inhibiting the increase in Youngs modulus. TNTZ aged at 573 K for 3. 6 ks or 10. 8 ks after cold rolling exhibits high tensile strength and acceptable elongation with relatively low Youngs modulus. However,the fatigue strength of TNTZ aged at 573 K for 3. 6 ks is not significantly improved. On the other hand, the fatigue strength of the TNTZ sample aged at 573 K for 10. 8 ks is improved as well as its tensile strength.
Titanium alloy biomaterial microstructure omega phase aging low Youngs modulus fatigue strength
Masaaki Nakai Mitsuo Niinomi
Institute for Materials Research,Tohoku University,Sendai 980-8577,Japan
国际会议
The 12th World Conference Titanium(第十二届世界钛会 Ti-2011)
北京
英文
2102-2105
2011-06-19（万方平台首次上网日期，不代表论文的发表时间）