TY - GEN
T1 - Nanostructure and fatigue behavior of β-type titanium alloy subjected to high-pressure torsion after aging treatment
AU - Yilmazer, Hakan
AU - Niinomi, Mitsuo
AU - Cho, K.
AU - Nakai, M.
AU - Hieda, J.
AU - Todaka, Y.
PY - 2014/1/1
Y1 - 2014/1/1
N2 - A novel β-type, Ti-29Nb-13Ta-4.6Zr, referred to as TNTZ has been developed for biomedical applications. Its fatigue strength is one of the most important mechanical biocompatibilities of TNTZ because, in surgical applications, it will be used under cyclic loading conditions. The effect of the microstructural refinement by high-pressure torsion (HPT) on the fatigue behaviour of TNTZ is systematically investigated in this study. TNTZ subjected to HPT processing where the rotation number (N) is 20 (TNTZAHPT) after aging treatment (AT) shows a unique microstructure having ultrafine elongated grains (285 nm in length and 36 nm in width) with high-density dislocations, a large fraction of blurred and wavy boundaries consisting of nonuniform subgrains with high misorientation and nanostructured precipitated α phase. Remarkably, a good combination of high mechanical strength (1375 MPa) and low Young's modulus (87 GPa), compared to that of Ti-6Al-4V (Ti64) ELI, is achieved for TNTZAHPT at N = 20. TNTZAHPT a great fatigue strength, which is comparable to those of (Ti64) ELI.
AB - A novel β-type, Ti-29Nb-13Ta-4.6Zr, referred to as TNTZ has been developed for biomedical applications. Its fatigue strength is one of the most important mechanical biocompatibilities of TNTZ because, in surgical applications, it will be used under cyclic loading conditions. The effect of the microstructural refinement by high-pressure torsion (HPT) on the fatigue behaviour of TNTZ is systematically investigated in this study. TNTZ subjected to HPT processing where the rotation number (N) is 20 (TNTZAHPT) after aging treatment (AT) shows a unique microstructure having ultrafine elongated grains (285 nm in length and 36 nm in width) with high-density dislocations, a large fraction of blurred and wavy boundaries consisting of nonuniform subgrains with high misorientation and nanostructured precipitated α phase. Remarkably, a good combination of high mechanical strength (1375 MPa) and low Young's modulus (87 GPa), compared to that of Ti-6Al-4V (Ti64) ELI, is achieved for TNTZAHPT at N = 20. TNTZAHPT a great fatigue strength, which is comparable to those of (Ti64) ELI.
KW - Aging treatment
KW - Fatigue behavior
KW - High-pressure torsion
KW - Metallic biomaterials
KW - Metastable β-type titanium alloy
KW - Microstructural refinement
UR - http://www.scopus.com/inward/record.url?scp=84898873855&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84898873855&partnerID=8YFLogxK
U2 - 10.4028/www.scientific.net/AMR.891-892.9
DO - 10.4028/www.scientific.net/AMR.891-892.9
M3 - Conference contribution
AN - SCOPUS:84898873855
SN - 9783038350088
T3 - Advanced Materials Research
SP - 9
EP - 14
BT - 11th International Fatigue Congress
PB - Trans Tech Publications
T2 - 11th International Fatigue Congress, FATIGUE 2014
Y2 - 2 March 2014 through 7 March 2014
ER -