A New Method to Improve Mechanical and Biological Properties of Ti-6Al-4V ELI
Based on Ti-6Al-4V ELI, which is the most widely used Ti alloy for medical implants, the potential of Equal Channel Angular Pressing (ECAP) for improving mechanical properties as well as cytocompatibility is presented and discussed. ECAP - one of the Severe Plastic Deformation (SPD) techniques - achieves a strong microstructural refinement of metallic materials down to the sub-micrometer and even nanometer range, thereby increasing the strength without changing their bulk shape or sacrificing their ductility. Ti-6Al-4V ELI after ECAP followed by a special thermo-mechanical treatment exhibits a tensile strength higher than 1300 MPa. This value means an increase of strength of at least 30 ％ as compared to conventionally treated material. As a consequence,load-bearing implants or parts of them (e. g. necks of hip implants) made of ECAPprocessed TH5A1-4V ELI can be designed smaller and thus enable maximum patients mobility and quality of life. Moreover, the ultrafine-grained microstructure in ECAP materials is the origin of low-temperature / high-strain-rate superplasticity (in ECAP-processed Ti-6Al-4V elongations without failure up to more than 800％ could be realized). Investigations of the influence of ECAP on cytocompatibility revealed that initial cell attachment as well as cell viability were considerably improved in the case of the ECAPprocessed material.
Equal channel angular pressing (ECAP) cytocompatibility titanium alloy (Ti-6Al-4V) implant strength
Bernhard Mingler Maciej Krystian Manfred Bammer
AIT Austrian Institute of Technology GmbH,Health & Environment Department,Biomedical Systems,Viktor-Kaplan-Str.2,2700 Wr. Neustadt,Austria
国际会议
The 12th World Conference Titanium(第十二届世界钛会 Ti-2011)
北京
英文
2067-2071
2011-06-19（万方平台首次上网日期，不代表论文的发表时间）