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High-temperature tensile deformation behavior of hot rolled CrMnFeCoNi high-entropy alloy

Title
High-temperature tensile deformation behavior of hot rolled CrMnFeCoNi high-entropy alloy
Authors
Jang, Min JiPraveen, S.Sung, Hyun JeBae, Jae WungMoon, JongunKim, Hyoung Seop
POSTECH Authors
Kim, Hyoung Seop
Date Issued
Jan-2018
Publisher
ELSEVIER SCIENCE SA
Abstract
In the present study, high temperature (700-1100 degrees C) tensile deformation behavior of hot-rolled CrMnFeCoNi high-entropy alloy was investigated. A single face-centered cubic phase was retained in the hot deformed specimens under different deformation conditions. The flow behavior was significantly influenced by temperature and microstructure evolution. A strong temperature dependence of yield stress was observed with a drastic drop in yield strength from 413 MPa at 700 degrees C to 94 MPa at 900 degrees C. A profound increase in ductility was observed above 700 degrees C and a perceptive decrease in ductility was observed above 900 degrees C. Electron backscatter diffraction analysis indicates incomplete dynamic recrystallization at 700 degrees C leading to a significant difference in the flow behavior. (C) 2017 Elsevier B.V. All rights reserved.
In the present study, high temperature (700-1100 degrees C) tensile deformation behavior of hot-rolled CrMnFeCoNi high-entropy alloy was investigated. A single face-centered cubic phase was retained in the hot deformed specimens under different deformation conditions. The flow behavior was significantly influenced by temperature and microstructure evolution. A strong temperature dependence of yield stress was observed with a drastic drop in yield strength from 413 MPa at 700 degrees C to 94 MPa at 900 degrees C. A profound increase in ductility was observed above 700 degrees C and a perceptive decrease in ductility was observed above 900 degrees C. Electron backscatter diffraction analysis indicates incomplete dynamic recrystallization at 700 degrees C leading to a significant difference in the flow behavior. (C) 2017 Elsevier B.V. All rights reserved.
Keywords
SEVERE PLASTIC-DEFORMATION; DYNAMIC RECRYSTALLIZATION; GRAIN-SIZE; MECHANICAL-PROPERTIES; ELEVATED-TEMPERATURES; CRYSTAL-STRUCTURES; PROCESSING MAPS; CO-CR; MICROSTRUCTURE; FE
URI
http://oasis.postech.ac.kr/handle/2014.oak/50421
DOI
10.1016/j.jallcom.2017.09.293
ISSN
0925-8388
Article Type
Article
Citation
JOURNAL OF ALLOYS AND COMPOUNDS, vol. 730, page. 242 - 248, 2018-01
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 KIM, HYOUNG SEOP
Dept of Materials Science & Enginrg
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