Development of Ultrafine and Nano-crystalline Grain Structures during Modified Accumulative Roll Bonding of Titanium Alloy,Ti-25Nb-3Zr-3Mo-2Sn.
Titanium alloys with high strength to weight,excellent toughness,corrosion resistance and biocompatibility are favoured for a wide range of bio-medical applications. The near β Ti-25Nb-3Zr- 3Mo2Sn alloy (TLM) is a new biomedical alloy suitable for implant applications. As well as being biocompatible.Ti alloys for surgical implants need to be mechanically compatible. A modified accumulative roll bonding (ARB) process was developed to form a high strength, ultrafine grain version of the alloy. With each ARB cycle,iterative strength improvements lead to an almost doubling of the strength of the alloy after 4 cycles. This is coupled with an initial large drop in the ductility which then showed some recovery in subsequent cycles. A detailed investigation of the evolution of the microstructure was undertaken. There is a large variation in the grain sizes throughout processing and at the completion of 4 cycles the grain sizes range from ＞1μm to ＜20nm. Contributing to refinement is a dense network of shear bands made up of UFG grains ＜20nm in size which form in later cycles.
Titanium (Ti) biomedical accumulative roll bonding (ARB) ultrafine grained (UFG) microstructure transmission electron mi-croscopy (TEM)
Damon Kent Gui Wang Zhentao Yu Xiqun Ma Matthew S. Dargusch
Defence Materials Technology Centre,CAST CRC,School of Mechanical and Mining Engineering,The Univers Biomaterial Research Centre,North-west Institute for Nonferrous Metal Research,Xian 710016,China
国际会议
The 12th World Conference Titanium(第十二届世界钛会 Ti-2011)
北京
英文
2111-2115
2011-06-19（万方平台首次上网日期，不代表论文的发表时间）