Journal
METALS
Volume 10, Issue 11, Pages -Publisher
MDPI
DOI: 10.3390/met10111463
Keywords
high-entropy alloys; titanium; biomaterials; bone tissue engineering; mechanical alloying; Young’ s modulus
Funding
- VI Research Program of the University of Seville [2019/00000600]
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In this work, an equiatomic TiNbTaMoZr-based high-entropy alloy (HEA) has been developed by a powder metallurgy route, which consists of a process of combined one-step low-temperature mechanical milling starting from the transition metals as raw materials and a subsequent pressureless sintering. In this way, the optimized synthesized specimen, after 10 h of milling time, showed two different body-centered cubic (bcc) TiNbTaMoZr alloys, which, after sintering at 1450 degrees C, 1 h of dwell time and a heating and cooling rate of 5 degrees C min(-1), it remained formed as two bcc TiNbTaMoZr-based HEAs. This material, with micrometric and equiaxed particles, and with homogeneously distributed phases, presented a Young's modulus that was significantly higher (5.8 GPa) and lower (62.1 GPa) than that of the usual commercially pure (cp) Ti and Ti6Al4V alloy used for bone-replacement implants. It also presented similar values to those of the HEAs developed for the same purpose. These interesting properties would enable this TiNbTaMoZr-based HEA to be used as a potential biomaterial for bulk or porous bone implants with high hardness and low Young ' s modulus, thereby preventing the appearance of stress-shielding phenomena.
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