Thermodynamics-based design strategy for optimizing strength and ductility of Cr-Ni-Mn-Fe medium-entropy alloys
JOURNAL OF ALLOYS AND COMPOUNDS(2022)
Abstract
Single-phase high-entropy alloys and medium-entropy alloys (MEAs) with face-centered-cubic (FCC) structures have attracted considerable attention owing to their exceptional strength and ductility at cryogenic temperatures by performing twinning and martensitic transformations. In this study, a series of novel MEAs were developed (Cr12Ni12MnxFe76-x, x = 12, 16, 20) based on a thermodynamic approach. The Cr12Ni12Mn16Fe60 MEA was discovered to possess a unique combination of excellent strength (similar to 1050 MPa) and ductility (similar to 86%) at cryogenic temperatures. Through experimental assessment and thermodynamic modeling, the strength-ductility synergy was quantitatively demonstrated to be derived from the interplay among a series of plasticity mechanisms. In addition, a model was proposed for evaluating the stacking fault energy of Cr-Ni-Mn-Fe MEAs at different temperatures. This work demonstrates an efficient and novel strategy for developing high-strength and high-ductility alloys with single-phase FCC structures. (C) 2021 Elsevier B.V. All rights reserved.
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Key words
Medium-entropy Alloys, Stacking fault energy, Cryogenic temperature, Transformation-induced plasticity, Twinning-induced plasticity
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