Deactivating deformation twinning in medium-entropy CrCoNi with small additions of aluminum and titanium
Slone C, LaRosa CR, Zenk CH, George EP, Ghazisaeidi M, Mills MJ (2020)
Publication Language: English
Publication Status: Published
Publication Type: Journal article, Original article
Publication year: 2020
Journal
Publisher: Acta Materialia Inc
Book Volume: 178
Pages Range: 295-300
DOI: 10.1016/j.scriptamat.2019.11.053
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. 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 with CRIS profile
Involved external institutions
Ohio State University
United States (USA) (US)
Oak Ridge National Laboratory
United States (USA) (US)
United States (USA) (US)
Oak Ridge National Laboratory
United States (USA) (US)
How to cite
APA:
Slone, C., LaRosa, C.R., Zenk, C.H., George, E.P., Ghazisaeidi, M., & Mills, M.J. (2020). Deactivating deformation twinning in medium-entropy CrCoNi with small additions of aluminum and titanium. Scripta Materialia, 178, 295-300. https://dx.doi.org/10.1016/j.scriptamat.2019.11.053
MLA:
Slone, Connor, et al. "Deactivating deformation twinning in medium-entropy CrCoNi with small additions of aluminum and titanium." Scripta Materialia 178 (2020): 295-300.
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