TY - JOUR
T1 - Effect of Zr on super-elasticity and mechanical properties of Ti-24at% Nb-(0, 2, 4)at% Zr alloy subjected to aging treatment
AU - Li, Qiang
AU - Niinomi, Mitsuo
AU - Nakai, Masaaki
AU - Cui, Zhenduo
AU - Zhu, Shengli
AU - Yang, Xianjin
PY - 2012/2/28
Y1 - 2012/2/28
N2 - β-Type titanium alloys with composition of Ti-24. at% Nb-(0, 2, 4). at% Zr were prepared and subjected to aging treatment for different durations. The addition of Zr suppressed the formation and growth of isothermal ω phase during aging treatment, and therefore the investigated Ti-Nb-Zr alloys with different Zr content performed various deformation mechanisms, mechanical properties and super-elastic effects with the changes of aging time. The isothermal ω phase exerted inhibitory effects on twinning and stress-induced martensitic transformation. Desirable properties were obtained in Ti-Nb-Zr alloy by adding suitable Zr content and processing short time aging treatment. Ti-24. at% Nb-2. at% Zr alloy subjected to aging treatment at 573. K for 7.2. ks exhibited an ultimate tensile strength of 710. MPa, an elongation of 13%, a Young's modulus of 64. GPa, and a super-elastic recovery strain of 4.3%. Ti-24. at% Nb-4. at% Zr alloy subjected to aging treatment at 573. K for 1.8. ks, 3.6. ks, and 7.2. ks performed a low Young's modulus of 62. GPa and ultimate tensile strength around 600. MPa.
AB - β-Type titanium alloys with composition of Ti-24. at% Nb-(0, 2, 4). at% Zr were prepared and subjected to aging treatment for different durations. The addition of Zr suppressed the formation and growth of isothermal ω phase during aging treatment, and therefore the investigated Ti-Nb-Zr alloys with different Zr content performed various deformation mechanisms, mechanical properties and super-elastic effects with the changes of aging time. The isothermal ω phase exerted inhibitory effects on twinning and stress-induced martensitic transformation. Desirable properties were obtained in Ti-Nb-Zr alloy by adding suitable Zr content and processing short time aging treatment. Ti-24. at% Nb-2. at% Zr alloy subjected to aging treatment at 573. K for 7.2. ks exhibited an ultimate tensile strength of 710. MPa, an elongation of 13%, a Young's modulus of 64. GPa, and a super-elastic recovery strain of 4.3%. Ti-24. at% Nb-4. at% Zr alloy subjected to aging treatment at 573. K for 1.8. ks, 3.6. ks, and 7.2. ks performed a low Young's modulus of 62. GPa and ultimate tensile strength around 600. MPa.
KW - Aging
KW - Mechanical property
KW - Super-elasticity
KW - Titanium alloy
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U2 - 10.1016/j.msea.2011.12.103
DO - 10.1016/j.msea.2011.12.103
M3 - Article
AN - SCOPUS:84862808895
VL - 536
SP - 197
EP - 206
JO - Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing
JF - Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing
SN - 0921-5093
ER -