Gradation of Mechanical Properties by Local Heating in Beta TiNbSn Alloy
In the development of high performance artificial hip prostheses low Youngs modulus for suppressing stress shielding and high strength for both enduring several times the patients body weight and avoiding dislocation arising from impingement are simultaneously required for a stem. However,a tradeoff is known between low Youngs modulus and high strength in many alloys. Recently,we have proposed a new concept for stem fabrication that low Youngs modulus is given in a distal part by cold working and high strength in a proximal part by local heating after cold working. In order to obtain fundamental information on gradation of temperature and mechanical properties a cold swaged β Ti-33.6 wt％ Nb4wt％Sn rod with 9mm in diameter and 100 mm in length was locally heated at one edge. Temperature distribution on and in the rod was measured by thermography and thermocouples,respectively,as a function of distance from the other edge. Youngs modulus and tensile properties were measured using swaged rod samples subjected to various heat treatments, referring to temperature distribution in local heating. It is found that sharp temperature gradation can be obtained from the heated edge toward the other edge because of low thermal conductivity of the alloy,and correspondingly mechanical properties are graded.
Titanium (Ti) body centered cubic (bcc) biomaterials Young s modulus tensile strength gradation
Shuji Hanada Taek Kyun Jung Naoya Masahashi Norikazu Yamada Tadashi Hasega-wa Yoshio Asano Tomoo Kobayashi
Institute for Materials Research,Tohoku University,Sendai 980-8577,Japan Korea Institute of Industrial Technology,Incheon 406-840,Korea Tohoku University Graduate School of Medicine,Sendai 980-8575,Japan Mizuho Co.,Ltd.,Tokyo 113-0033 Japan TDF Corp.,Murata,989-1321 Japan SII Seiko Instruments Inc.,Sendai 989-3124 Japan
国际会议
The 12th World Conference Titanium(第十二届世界钛会 Ti-2011)
北京
英文
2098-2101
2011-06-19（万方平台首次上网日期，不代表论文的发表时间）