Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 792, Issue -, Pages 1028-1035Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2019.04.121
Keywords
High-entropy alloy; Carbide; Precipitation; Tensile property; Strengthening
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Funding
- U.S. Department of Energy, Office of Science, Basic Energy Sciences, Materials Sciences and Engineering Division
- National MCF Energy RD Program [2018YFE0313300]
- State Key Laboratory for Advanced Metals and Materials [2018-ZD03]
- National Natural Science Foundation of China [51604222, 51775204]
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The equiatomic CrMnFeCoNi high-entropy alloy (HEA) exhibits outstanding toughness and excellent strength-ductility combination at cryogenic temperatures. However, its strength is relatively low at room temperature. In order to strengthen this HEA, microalloying additions of 0.8 at.% Nb and C were made and its properties and microstructure evaluated. It was found that the microalloying resulted in the formation of carbide precipitates and a reduction of the grain size to similar to 2.6 mu m. As a result, the room-temperature tensile yield strength (732 MPa) of the microalloyed HEA is roughly double that of the base HEA (with a concomitant increase in the ultimate strength) while its ductility is maintained at a relatively high level (elongation to fracture of similar to 32%). The strengthening is due to precipitation hardening from the nanoscale carbide particles and grain refinement. Crown Copyright (C) 2019 Published by Elsevier B.V. All rights reserved.
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