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Title: In situ neutron diffraction study on tensile deformation behavior of carbon-strengthened CoCrFeMnNi high-entropy alloys at room and elevated temperatures

Abstract

In this paper, carbon is doped into a CoCrFeMnNi high-entropy alloy as an interstitial atom, improving the single phase solid solution alloy with a good combination of strength and ductility at room temperature by introducing deformation twins. In situ neutron diffraction (ND) is applied to investigate the carbon-doped CoCrFeMnNi deformation mechanism and micromechanical behaviors during uniaxial tension at room and elevated temperatures. With in situ results accompanied with the microstructure and texture measurement, it is found that the plastic deformation is dominated by dislocation slip at an early stage at both temperatures. However, at high strain level, deformation is mediated simultaneously by deformation twins and microbands at room temperature, while it is governed solely by microbands at elevated temperature of 573 K. The evolution of lattice strain, peak intensity, and peak width from in situ ND elucidates the micromechanical behaviors regarding the role of slips and twins. Finally, the texture represented by orientation distribution function indicates that the initial specimen possesses a relatively strong {112} <110> texture component, and the room-temperature tension deformed texture comprises of slip-induced fiber texture and twinning-induced {115} <552> texture component.

Authors:
 [1];  [2]; ORCiD logo [3];  [4]
  1. Univ. of Tennessee, Knoxville, TN (United States). Dept. of Materials Science and Engineering; Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science and Technology Division. Neutron Scattering Division
  2. Univ. of Tennessee, Knoxville, TN (United States). Dept. of Materials Science and Engineering; Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science and Technology Division
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science and Technology Division
  4. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Neutron Scattering Division
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1464002
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Materials Research
Additional Journal Information:
Journal Volume: 33; Journal Issue: 19; Journal ID: ISSN 0884-2914
Publisher:
Materials Research Society
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Liu, Tingkun, Gao, Yanfei, Bei, Hongbin, and An, Ke. In situ neutron diffraction study on tensile deformation behavior of carbon-strengthened CoCrFeMnNi high-entropy alloys at room and elevated temperatures. United States: N. p., 2018. Web. doi:10.1557/jmr.2018.180.
Liu, Tingkun, Gao, Yanfei, Bei, Hongbin, & An, Ke. In situ neutron diffraction study on tensile deformation behavior of carbon-strengthened CoCrFeMnNi high-entropy alloys at room and elevated temperatures. United States. doi:10.1557/jmr.2018.180.
Liu, Tingkun, Gao, Yanfei, Bei, Hongbin, and An, Ke. Fri . "In situ neutron diffraction study on tensile deformation behavior of carbon-strengthened CoCrFeMnNi high-entropy alloys at room and elevated temperatures". United States. doi:10.1557/jmr.2018.180. https://www.osti.gov/servlets/purl/1464002.
@article{osti_1464002,
title = {In situ neutron diffraction study on tensile deformation behavior of carbon-strengthened CoCrFeMnNi high-entropy alloys at room and elevated temperatures},
author = {Liu, Tingkun and Gao, Yanfei and Bei, Hongbin and An, Ke},
abstractNote = {In this paper, carbon is doped into a CoCrFeMnNi high-entropy alloy as an interstitial atom, improving the single phase solid solution alloy with a good combination of strength and ductility at room temperature by introducing deformation twins. In situ neutron diffraction (ND) is applied to investigate the carbon-doped CoCrFeMnNi deformation mechanism and micromechanical behaviors during uniaxial tension at room and elevated temperatures. With in situ results accompanied with the microstructure and texture measurement, it is found that the plastic deformation is dominated by dislocation slip at an early stage at both temperatures. However, at high strain level, deformation is mediated simultaneously by deformation twins and microbands at room temperature, while it is governed solely by microbands at elevated temperature of 573 K. The evolution of lattice strain, peak intensity, and peak width from in situ ND elucidates the micromechanical behaviors regarding the role of slips and twins. Finally, the texture represented by orientation distribution function indicates that the initial specimen possesses a relatively strong {112} <110> texture component, and the room-temperature tension deformed texture comprises of slip-induced fiber texture and twinning-induced {115} <552> texture component.},
doi = {10.1557/jmr.2018.180},
journal = {Journal of Materials Research},
number = 19,
volume = 33,
place = {United States},
year = {2018},
month = {6}
}

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Free Publicly Available Full Text
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Cited by: 4 works
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Figures / Tables:

Fig. 3 Fig. 3: (a) Engineering stress-strain curves, (b) true stress-strain curves and work hardening rate as a function of true plastic strain of tensile tests at 293K and 573K.

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    Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.