Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 624, Issue -, Pages 100-107Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2014.11.064
Keywords
High-entropy alloys; Refractory alloys; Mechanical property; Solution hardening
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Funding
- Ministry of Science and Technology of Taiwan [MOST 102-2221-E-007-047-MY3]
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This study developed a series of refractory AlxHfNbTaTiZr high-entropy alloys (HEAs) with an aim to improve strength, and reduce density of the very ductile base alloy HfNbTaTiZr. Despite the diversity of crystal structures among the constituent elements, all the HEAs are single solid solution phase with body-centered cubic (BCC) structure. The addition of Al significantly improves the strength but reduces the ductility due to large solution hardening. The linear relation between yield strength and atomic percentage of Al suggests that the strengthening effect of a certain element in a single-phase HEA alloy can be explained based on quasi-binary alloy concept. Crack formations in deformed AlHfNbTaTiZr alloy with the lowest fracture strain are mainly along the boundaries between dendrite and interdendrite. This agrees with its large deviation of Al content and thus strength between dendrite and interdendrite. (C) 2014 Elsevier B.V. All rights reserved.
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