Additive manufacturing Ti6Al4V alloys have found their potential applications in artificial teeth and hip joints. In this work, the relationships between wear resistance, hardness and microstructure of Ti6Al4V alloys fabricated using various routes were investigated in artificial saliva. The results indicate that comparing with wrought and wrought + heat treated (HT) samples, the as-SLMed samples with hcp-α′ martensite and few bcc-β phase exhibit higher hardness (∼410 HV) and better wear resistance. The as-SLMed samples, however, exhibit the worst wear resistance when wear direction is parallel to the molten pool line on XOZ-plane due to containing the softer fusion zone. Finally, the wear mechanism is discussed in detail, mainly including the abrasive and adhesive wear mechanism. The high hardness of matrix as well as the strong adhesion between the hardened layer, oxide layer and matrix are indispensable conditions for maintaining the optimum wear resistance.

增材制造Ti6Al4V合金已发现其在人造牙齿和髋关节中的潜在应用。在这项工作中，研究了在人造唾液中采用各种途径制造的Ti6Al4V合金的耐磨性，硬度和显微组织之间的关系。结果表明，与锻造和锻造+热处理（HT）样品相比，具有hcp-α'马氏体且bcc-β相少的as-SLMed样品具有更高的硬度（〜410 HV）和更好的耐磨性。但是，当磨损方向平行于XOZ平面上的熔池线时，由于包含较软的熔合区，按SLM处理的样品表现出最差的耐磨性。最后，详细讨论了磨损机理，主要包括磨料和粘合剂的磨损机理。