Journal
INTERMETALLICS
Volume 95, Issue -, Pages 59-72Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.intermet.2018.01.017
Keywords
High-entropy alloys; Microstructure; Mechanical properties; Solid solution hardening; Alloy design
Categories
Funding
- National Natural Science Foundation of China [51571192]
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In this work, the evolution of microstructure and fundamental mechanical properties with Mo concentration in the arc-melted (TiZrNbTa)(100-x)Mo-x (0 <= x <= 20) high-entropy alloys (HEAs) are investigated. The arc-melted (TiZrNbTa)(100-x)Mo-x alloys structurally consist of two bcc phases. The change in volume fractions of two phases in the microstructure is insignificant with Mo concentration, at levels of similar to 75% for bcc1 and similar to 25% for bcc2. The increases in microhardness and Young's modulus of the alloys linearly scale with Mo concentration. To compromise the strength and ductility, the (TiZrNbTa)(90)Mo-10 exhibits an optimal combination of stiffness (E = 137 GPa), compressive yield strength (sigma(y) = 1370 MPa) and deformability (epsilon(p) approximate to 25%). In addition, it is indicated that dislocation widths in bcc lattice of refractory HEAs are insensitive to the alloying complexity, reflecting that the Peierls barrier is excluded as a predominant factor of strengthening. Furthermore, a simple model is proposed to reveal the solid solution hardening (SSH) in bcc refractory HEAs, in which the solid solutions are treated as an imposition of distortion-free and distorted lattices. By applying this model to archived refractory HEAs, the predicted yield strength agrees well with experimentally measured values. It provides a simple empirical tool used for predicting the strength of bcc refractory HEAs and to assist new alloy design.
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