Journal
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
Volume 86, Issue -, Pages 271-284Publisher
JOURNAL MATER SCI TECHNOL
DOI: 10.1016/j.jmst.2021.01.061
Keywords
Non-equiatomic; Grain-boundary precipitation; High-entropy alloys; Ductility; Transformation-induced plasticity
Funding
- National Natural Science Foundation of China [51871178]
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The study introduces a novel strategy utilizing the local stress concentration induced by grain-boundary precipitation as a driving force to trigger phase transformation in high-entropy alloys, resulting in a superior combination of high strength and high ductility.
Grain-boundary (GB) precipitation has a significant adverse effect on plasticity of alloys, which easily leads to catastrophic intergranular failure in safety-critical applications under high external loading. Herein, we report a novel strategy that uses the local stress concentration induced by GB precipitates as a driving force to trigger phase transformation of preset non-equiatomic high-entropy solid-solution phase at GBs. This in situ deformation-induced phase transformation at GBs introduces a well-known effect: transformation-induced plasticity (TRIP), which enables an exceptional elongation to fracture (above 38 %) at a high strength (above 1.5 GPa) in a GB precipitation-hardened high-entropy alloy (HEA). The present strategy in terms of local stress concentration-induced phase transformations at GBs may provide a fundamental approach by taking advantage of (rather than avoiding) the GB precipitation to gain a superior combination of high strength and high ductility in HEAs. (C) 2021 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.
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