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Title: Deactivating deformation twinning in medium-entropy CrCoNi with small additions of aluminum and titanium

Abstract

High strain-hardening rates in equiatomic CrCoNi and other multi-principal element alloys have been attributed to deformation twinning. This work shows that small additions of Al and Ti to a CrCoNi alloy deactivate deformation twinning with only minor changes to uniform elongation and ultimate tensile strength. Here, the initial microstructure is free of chemically ordered (Al,Ti)-rich precipitates after solutionizing and quenching. Tensile properties for the alloy are reported and compared to equiatomic CrCoNi, and the post-deformation microstructure is assessed. Density functional theory calculations indicate that energetically unfavorable Al-Al bonds may discourage shearing via partial dislocations, which are necessary for twinning to occur.

Authors:
 [1];  [1]; ORCiD logo [1]; ORCiD logo [2];  [1];  [1]
  1. The Ohio State Univ., Columbus, OH (United States)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)
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); National Science Foundation (NSF)
OSTI Identifier:
1606850
Alternate Identifier(s):
OSTI ID: 1797865
Grant/Contract Number:  
AC05-00OR22725; DMR-60050072; DGE-1343012; DMR-1553355; -60050072; DMR- 1553355
Resource Type:
Accepted Manuscript
Journal Name:
Scripta Materialia
Additional Journal Information:
Journal Volume: 178; Journal Issue: C; Journal ID: ISSN 1359-6462
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; medium- and high-entropy alloys; CrCoNi alloy; TWIP steel; deformation twinning; work-hardening

Citation Formats

Slone, C. E., LaRosa, C. R., Zenk, C. H., George, Easo P., Ghazisaeidi, M., and Mills, Michael J.. Deactivating deformation twinning in medium-entropy CrCoNi with small additions of aluminum and titanium. United States: N. p., 2019. Web. https://doi.org/10.1016/j.scriptamat.2019.11.053.
Slone, C. E., LaRosa, C. R., Zenk, C. H., George, Easo P., Ghazisaeidi, M., & Mills, Michael J.. Deactivating deformation twinning in medium-entropy CrCoNi with small additions of aluminum and titanium. United States. https://doi.org/10.1016/j.scriptamat.2019.11.053
Slone, C. E., LaRosa, C. R., Zenk, C. H., George, Easo P., Ghazisaeidi, M., and Mills, Michael J.. Tue . "Deactivating deformation twinning in medium-entropy CrCoNi with small additions of aluminum and titanium". United States. https://doi.org/10.1016/j.scriptamat.2019.11.053. https://www.osti.gov/servlets/purl/1606850.
@article{osti_1606850,
title = {Deactivating deformation twinning in medium-entropy CrCoNi with small additions of aluminum and titanium},
author = {Slone, C. E. and LaRosa, C. R. and Zenk, C. H. and George, Easo P. and Ghazisaeidi, M. and Mills, Michael J.},
abstractNote = {High strain-hardening rates in equiatomic CrCoNi and other multi-principal element alloys have been attributed to deformation twinning. This work shows that small additions of Al and Ti to a CrCoNi alloy deactivate deformation twinning with only minor changes to uniform elongation and ultimate tensile strength. Here, the initial microstructure is free of chemically ordered (Al,Ti)-rich precipitates after solutionizing and quenching. Tensile properties for the alloy are reported and compared to equiatomic CrCoNi, and the post-deformation microstructure is assessed. Density functional theory calculations indicate that energetically unfavorable Al-Al bonds may discourage shearing via partial dislocations, which are necessary for twinning to occur.},
doi = {10.1016/j.scriptamat.2019.11.053},
journal = {Scripta Materialia},
number = C,
volume = 178,
place = {United States},
year = {2019},
month = {12}
}