TY - GEN
T1 - Mechanical performance and biocompatibility of biomedical beta-type titanium alloy subjected to micro-shot peening
AU - Akahori, Toshikazu
AU - Oguchi, Yurie
AU - Hattori, Tomokazu
AU - Fukui, Hisao
AU - Niinomi, Mitsuo
N1 - Copyright:
Copyright 2020 Elsevier B.V., All rights reserved.
PY - 2014
Y1 - 2014
N2 - Beta-type Ti-29Nb-13Ta-4.6Zr (TNTZ) was recently developed as a representative biomedical Ti alloy. As-solutionized TNTZ has a low Young's modulus less than 60 GPa close to that of cortical bone along with very low cytotoxicity and good bone biocompatibility. Solution treatment and aging (STA) is a typical heat treatment for improving the mechanical properties of beta-type titanium alloys. However, STA also drastically increases the Young's modulus. Therefore, this study investigated the effects of surface modification, micro-shot peening, on the mechanical properties of TNTZ subjected to severe thermomechanical treatment in order to maintain a relatively low Young's modulus. The bone contact characteristics of TNTZ samples subjected to surface modification and cancellous bone were also compared. The Vickers hardness of cold-swaged TNTZ (TNTZSW) subjected to micro-shot peening was significantly increased within 20 μm from the very edge of the specimen surface. The fatigue strength of TNTZSW subjected to micro-shot peening increased especially in the high cycle fatigue life region. The fatigue limit was around 400 MPa. The bone formations on TNTZSW subjected to micro-shot peening and TNTZSW with the mirror surface as comparison material were almost identical to each other. However, the relative bone contact ratio of TNTZSW subjected to micro-shot peening was better than that of TNTZSW with the mirror surface.
AB - Beta-type Ti-29Nb-13Ta-4.6Zr (TNTZ) was recently developed as a representative biomedical Ti alloy. As-solutionized TNTZ has a low Young's modulus less than 60 GPa close to that of cortical bone along with very low cytotoxicity and good bone biocompatibility. Solution treatment and aging (STA) is a typical heat treatment for improving the mechanical properties of beta-type titanium alloys. However, STA also drastically increases the Young's modulus. Therefore, this study investigated the effects of surface modification, micro-shot peening, on the mechanical properties of TNTZ subjected to severe thermomechanical treatment in order to maintain a relatively low Young's modulus. The bone contact characteristics of TNTZ samples subjected to surface modification and cancellous bone were also compared. The Vickers hardness of cold-swaged TNTZ (TNTZSW) subjected to micro-shot peening was significantly increased within 20 μm from the very edge of the specimen surface. The fatigue strength of TNTZSW subjected to micro-shot peening increased especially in the high cycle fatigue life region. The fatigue limit was around 400 MPa. The bone formations on TNTZSW subjected to micro-shot peening and TNTZSW with the mirror surface as comparison material were almost identical to each other. However, the relative bone contact ratio of TNTZSW subjected to micro-shot peening was better than that of TNTZSW with the mirror surface.
KW - Biocompatibility
KW - Mechanical properties
KW - Metallic biomaterial
KW - Microstructure
KW - Surface modification
UR - http://www.scopus.com/inward/record.url?scp=84904548493&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84904548493&partnerID=8YFLogxK
U2 - 10.4028/www.scientific.net/msf.783-786.1215
DO - 10.4028/www.scientific.net/msf.783-786.1215
M3 - Conference contribution
AN - SCOPUS:84904548493
SN - 9783038350736
T3 - Materials Science Forum
SP - 1215
EP - 1220
BT - THERMEC 2013
A2 - Mishra, B.
A2 - Ionescu, Mihail.
A2 - Chandra, T.
PB - Trans Tech Publications Ltd
T2 - 8th International Conference on Processing and Manufacturing of Advanced Materials, THERMEC 2013
Y2 - 2 December 2013 through 6 December 2013
ER -