Journal
MATERIALS & DESIGN
Volume 134, Issue -, Pages 426-433Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.matdes.2017.08.053
Keywords
High entropy alloy; Thermal stability; Atom probe tomography; Grain growth, strengthening
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Funding
- Naval Research Board (NRB), Directorate of Naval R&D, New Delhi, India [DNRD/05/4003/ NRB/190]
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Thermal stability of CoCrFeNi high entropy alloy in as-milled and sintered conditions was investigated using Xray diffraction, differential scanning calorimetry, transmission electron microscopy, and atom probe tomography. Composite microstructure consists of FCC and carbide with a fine dispersion of oxide was observed in the sintered condition. Unsolicited contamination of carbon and oxygen in the as-milled powder due to the milling medium had led to the formation of composite microstructure. An exceptional thermal stability was observed upon exposure of sintered compact to higher temperatures (0.56 T-m to 0.68 T-m) for the prolonged duration of 600 h. Sintered compact exposed to 700 degrees C (0.56 T-m) for 600 h showed negligible change in hardness and grain size. Analysis based on the modified Hall-Petch model for two phase alloy indicates the phase boundaries act as a strong obstacle while the major contribution to strengthening comes from grain boundaries. (C) 2017 Elsevier Ltd. All rights reserved.
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