期刊
MATERIALS SCIENCE & ENGINEERING C-MATERIALS FOR BIOLOGICAL APPLICATIONS
卷 73, 期 -, 页码 80-89出版社
ELSEVIER
DOI: 10.1016/j.msec.2016.12.057
关键词
High-entropy alloy; Mechanical property; Orthopedic implants; Solid solution; Refractory metal
资金
- National Natural Science Foundation of China [51571192]
Combining the high-entropy alloy (HEA) concept with property requirement for orthopedic implants, we designed a Ti(20)Zr(20)Nb(20)Ta(20)Mo(20)equiatomic HEA. The arc-melted microstructures, compressive properties and potentiodynamic polarization behavior in phosphate buffer solution (PBS) were studied in detail. It was revealed that the as-cast TiZrNbTaMo HEA consisted of dual phases with bcc structure, major bcc1 and minor bcc2 phases with the lattice parameters of 03310 nm and 03379 nm, respectively. As confirmed by nanoindentation tests, the bcc1 phase is somewhat harder and stiffer than the bcc2 phase. The TiZrNbTaMo HEA exhibited Young's modulus of 153 GPa, Vickers microhardness of 4.9 GPa, compressive yield strength of sigma(y)= 1390 MPa and apparent plastic strain of epsilon(p) approximate to 6% prior to failure. Moreover, the TiZrNbTaMo HEA manifested excellent corrosion resistance in PBS, comparable to the Ti6Al4V alloy, and pitting resistance remarkably superior to the 316L SS and CoCrMo alloys. These preliminary advantages of the TiZrNbTaMo HEA over the current orthopedic implant metals in mechanical properties and corrosion resistance offer an opportunity to explore new orthopedic-implant alloys based on the TiZrNbTaMo concentrated composition. (C) 2016 Elsevier B.V. All rights reserved.
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