选择激光熔化、热压缩和传统铸造工艺加工的Ti6Al4V生物合金的磨损行为

摘要

The aim of this work was to study the influence of the processing route on the microstructural constituents, hardness and tribological (wear and friction) behavior of Ti6Al4V biomedical alloy. In this sense, three different processing routes were studied:conventional casting, hot pressing and selective laser melting. A comprehensive metallurgical, mechanical and tribological characterization was performed by X-ray diffraction analysis, Vickers hardness tests and reciprocating ball-on-plate wear tests of Ti6Al4V/Al2O3 sliding pairs. The results showed a great influence of the processing route on the microstructural constituents and consequent differences on hardness and wear performance. The highest hardness and wear resistance were obtained for Ti6Al4V alloy produced by selective laser melting, due to a markedly different cooling rate that leads to significantly different microstructure when compared to hot pressing and casting. This study assesses and confirms that selective laser melting is potential to produce customized Ti6Al4V implants with improved wear performance.%本研究的主要目的是研究加工工艺对Ti6Al4V生物医学合金显微组织、硬度和摩擦学行为(摩擦和磨损行为)的影响.加工工艺包括传统铸造、热压缩和选择激光熔化.采用X射线衍射技术、维氏硬度测试和Ti6Al4V/Al2O3摩擦副的往复式球板磨损实验对Ti6Al4V生物医学合金的冶金、力学和摩擦学性能进行表征.结果表面,加工工艺路线对合金的显微组织、硬度和磨损行为的影响很大.采用选择激光熔化工艺获得的Ti6Al4V合金具有最高的硬度和最佳的耐磨性能,这是由于与采用热压缩和传统铸造工艺相比,选择激光熔化工艺具有显著不同的冷却速率,这使得合金具有明显不同的显微组织.本研究评估和证明选择激光熔化工艺在制备高耐磨Ti6Al4V生物植入体方面具有较大潜力.