TY - JOUR
T1 - Development of TiNbTaZrMo bio-high entropy alloy (BioHEA) super-solid solution by selective laser melting, and its improved mechanical property and biocompatibility
AU - Ishimoto, Takuya
AU - Ozasa, Ryosuke
AU - Nakano, Kana
AU - Weinmann, Markus
AU - Schnitter, Christoph
AU - Stenzel, Melanie
AU - Matsugaki, Aira
AU - Nagase, Takeshi
AU - Matsuzaka, Tadaaki
AU - Todai, Mitsuharu
AU - Kim, Hyoung Seop
AU - Nakano, Takayoshi
N1 - Publisher Copyright:
© 2020 Acta Materialia Inc. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/)
PY - 2021/3/15
Y1 - 2021/3/15
N2 - 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.
AB - 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.
KW - BioHEA
KW - Cooling rate
KW - High entropy alloy
KW - Segregation suppression
KW - Selective laser melting
UR - http://www.scopus.com/inward/record.url?scp=85097888819&partnerID=8YFLogxK
U2 - 10.1016/j.scriptamat.2020.113658
DO - 10.1016/j.scriptamat.2020.113658
M3 - 学術論文
AN - SCOPUS:85097888819
SN - 1359-6462
VL - 194
JO - Scripta Materialia
JF - Scripta Materialia
M1 - 113658
ER -