Development of TiNbTaZrMo bio-high entropy alloy (BioHEA) super-solid solution by selective laser melting, and its improved mechanical property and biocompatibility

• Published in: Scripta materialia Vol. 194; p. 113658
• Main Authors: Ishimoto, Takuya, Ozasa, Ryosuke, Nakano, Kana, Weinmann, Markus, Schnitter, Christoph, Stenzel, Melanie, Matsugaki, Aira, Nagase, Takeshi, Matsuzaka, Tadaaki, Todai, Mitsuharu, Kim, Hyoung Seop, Nakano, Takayoshi
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 15.03.2021
• Subjects: BioHEA; Cooling rate; High entropy alloy; Segregation suppression; Selective laser melting; Segregation suppression; Selective laser melting; High entropy alloy; Cooling rate; BioHEA
• ISSN: 1359-6462; 1872-8456
• DOI: 10.1016/j.scriptamat.2020.113658

BioHEAs, specifically designed high entropy alloy (HEA) systems for biomedical applications, represent a new era for biometals. However, recent challenges are (1) the poor shape customizability, and (2) the inevitable severe segregation due to the intrinsic fact that HEA is an ultra-multicomponent alloy system. To achieve shape customization and suppression of elemental segregation simultaneously, we used an extremely high cooling rate (~107 K/s) of the selective laser melting (SLM) process. We, for the first time, developed pre-alloyed Ti1.4Nb0.6Ta0.6Zr1.4Mo0.6 BioHEA powders and SLM-built parts with low porosity, customizable shape, excellent yield stress, and good biocompatibility. The SLM-built specimens showed drastically suppressed elemental segregation compared to the cast counterpart, representing realization of a super-solid solution. As a result, the 0.2% proof stress reached 1690 ± 78 MPa, which is significantly higher than that of cast Ti1.4Nb0.6Ta0.6Zr1.4Mo0.6 (1140 MPa). The SLM-built Ti1.4Nb0.6Ta0.6Zr1.4Mo0.6 BioHEA is promising as a next-generation metallic material for biomedical applications. [Display omitted]