TY - JOUR
T1 - Improvement in fatigue characteristics of newly developed beta type titanium alloy for biomedical applications by thermo-mechanical treatments
AU - Akahori, Toshikazu
AU - Niinomi, Mitsuo
AU - Fukui, Hisao
AU - Ogawa, Michiharu
AU - Toda, Hiroyuki
N1 - Funding Information:
Some parts of this study are supported by NEDO (New Energy and Industrial Technology Development Organization, Tokyo, Japan), Grant-in-Aid for Promoting Scientific Frontier Research from Ministry Education, Science and Culture (Tokyo, Japan), Grant-in-Aid for Scientific Research from Japan Society for Promotion of Science (Tokyo, Japan), Mitsubishi Foundation (Tokyo, Japan), Tokai Foundation (Toyohashi, Japan), The Iron and Steel Institute of Japan (Tokyo, Japan), The Light Metal Education Foundation (Osaka, Japan), Suzuki Foundation (Hamamatsu, Japan) and the Grant for the Excellent Research Project of Research Center for Future Technology, Toyohashi University of Technology. TA would like to express great thanks to Professor Daniel Eylon, The University of Dayton (Ohio, USA) for his assistance to complete this paper.
PY - 2005/5
Y1 - 2005/5
N2 - Tensile and plain fatigue properties of β type titanium alloy, Ti-29Nb-13Ta-4.6Zr, which underwent various thermo-mechanical treatments, were investigated in order to judge its potential for biomedical applications. Microstructures of Ti-29Nb-13Ta-4.6Zr (TNTZ) aged directly at 723 K for 259.2 ks after cold rolling and TNTZ aged at 723 K for 259.2 ks after solution treatment are composed of precipitated α phase in β phase. While, microstructures of TNTZ aged directly at 598 K and 673 K for 259.2 ks after cold rolling and aged at 598 K and 673 K for 259.2 ks after solution treatment are composed of precipitated ω phase, and precipitated α and ω phases in β phase, respectively. Tensile strength of aged TNTZ after solution treatment and aged TNTZ after cold rolling decreases with increasing aging temperature although the elongation shows the reverse trend. TNTZ composed of ω phase or ω and α phases in β phase shows the tensile strength of around 1000 MPa or more. Young's moduli of aged TNTZ after solution treatment and aged TNTZ after cold rolling decrease with increasing aging temperature. TNTZ conducted with solution treatment has the lowest Young's modulus of around 60 GPa. Fatigue strengths of aged TNTZ after solution treatment and aged TNTZ after cold rolling increase with increasing aging temperature. In particular, TNTZ aged directly at 723 K after cold rolling shows the greatest fatigue strength in both low cycle fatigue life and high cycle fatigue life regions, and the fatigue limit, which is around 770 MPa, is nearly equal to that of hot-rolled Ti-6Al-4V ELI conducted with aging, which is one of representative α + β type titanium alloys for biomedical applications.
AB - Tensile and plain fatigue properties of β type titanium alloy, Ti-29Nb-13Ta-4.6Zr, which underwent various thermo-mechanical treatments, were investigated in order to judge its potential for biomedical applications. Microstructures of Ti-29Nb-13Ta-4.6Zr (TNTZ) aged directly at 723 K for 259.2 ks after cold rolling and TNTZ aged at 723 K for 259.2 ks after solution treatment are composed of precipitated α phase in β phase. While, microstructures of TNTZ aged directly at 598 K and 673 K for 259.2 ks after cold rolling and aged at 598 K and 673 K for 259.2 ks after solution treatment are composed of precipitated ω phase, and precipitated α and ω phases in β phase, respectively. Tensile strength of aged TNTZ after solution treatment and aged TNTZ after cold rolling decreases with increasing aging temperature although the elongation shows the reverse trend. TNTZ composed of ω phase or ω and α phases in β phase shows the tensile strength of around 1000 MPa or more. Young's moduli of aged TNTZ after solution treatment and aged TNTZ after cold rolling decrease with increasing aging temperature. TNTZ conducted with solution treatment has the lowest Young's modulus of around 60 GPa. Fatigue strengths of aged TNTZ after solution treatment and aged TNTZ after cold rolling increase with increasing aging temperature. In particular, TNTZ aged directly at 723 K after cold rolling shows the greatest fatigue strength in both low cycle fatigue life and high cycle fatigue life regions, and the fatigue limit, which is around 770 MPa, is nearly equal to that of hot-rolled Ti-6Al-4V ELI conducted with aging, which is one of representative α + β type titanium alloys for biomedical applications.
KW - Microstructure
KW - Tensile properties
KW - Titanium-29mass%niobium-13mass%tantalum-4.6mass%zirconium
KW - Young's modulus and plain fatigue properties
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U2 - 10.1016/j.msec.2004.12.007
DO - 10.1016/j.msec.2004.12.007
M3 - Conference article
AN - SCOPUS:21444452763
VL - 25
SP - 248
EP - 254
JO - Materials Science and Engineering C
JF - Materials Science and Engineering C
SN - 0928-4931
IS - 3
T2 - Selected Papers Presented at the Materials Science and Technology 2004 Meeting: Titanium for Biomedical, Dental, and Healthcare
Y2 - 26 September 2004 through 29 September 2004
ER -