Comparative Study of Ti-6Cr-3Sn Biomedical Alloy in Solution Treated and 473K-Aged Conditions
Recently titanium and its alloys are finding extensive use as biomaterials due to their excellent mechanical properties, corrosion resistance and biocoMpatibility. Cr is a (3 phase stabilizing element and Sn is also a non-toxic element. Recently, we found that cold workability of Ti-xCr-3Sn alloys was improved with Cr additions due to β phase stabilization. In this study,mechanical properties and shape memory effect of metastable βTi-6Cr-3Sn alloy in solution-treated and 473K-aged conditions were investigated. Ti-6Cr3Sn alloy was developed by arc-melting method, homogenized at 1273K for 7. 2ks,cold rolled successfully to 96％ reduction and solution-treated at 1273K for 1. 8ks followed by quenching into water. Ageing treatment was carried out at 473K for 3. 6ks followed by quenching into water. Ti-6Cr-3Sn alloy (β phase) in solution treated conditions exhibited 585MPa UTS,41％ fracture strain, HV260 hardness,305MPa yield stress and 57％ shape recovery ratio. However by ageing at 473K for 3. 6ks,Ti-6Cr-3Sn alloy showed brittle fracture (2％ fracture strain), high yield stress (440MPa), high hardness (HV329) with no shape memory effect due to omega (hexagonal) phase precipitation. In cyclic loading- unloading tensile testing with a constant strain increment, Ti-6Cr3Sn alloy in the solution treated conditions showed pseudo elastic response. However Ti-6Cr-3Sn alloy aged at 473K for 3. 6ks did not show pseudo elastic response. It is concluded that Ti-6Cr-3Sn alloy in solution-treated conditions has potential for biomedical applications. However mechanical, shape memory and pseoudoelastic properties were drastically reduced by ageing at 473K.
Ti-6Cr-3Sn biomaterial ageing phase transformation mechanical propert ies pseudoelasticity
A. Wadood T. Inamura H. Hosoda S. Miyazaki
Precision and Intelligence Laboratory,Tokyo Institute of Technology,4259-R2-27,Midori-Ku,Yokohama 22 Institute of Materials Science,University of Tsukuba,Tennodai 1-1-1,Tsukuba,Ibaraki 305-8573,Japan
国际会议
The 12th World Conference Titanium(第十二届世界钛会 Ti-2011)
北京
英文
2086-2089
2011-06-19（万方平台首次上网日期，不代表论文的发表时间）