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Plastic deformation transition in FeCrCoNiAlx high-entropy alloys
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Applied Material Physics. Department of Physics and Astronomy, Division of Materials Theory, Uppsala University, Uppsala, Sweden.
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Applied Material Physics.ORCID iD: 0000-0001-7724-8299
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2019 (English)In: Materials Research Letters, ISSN 2166-3831, Vol. 7, no 11, p. 439-445Article in journal (Refereed) Published
Abstract [en]

The competition between plastic deformation mechanisms in FeCrCoNiAlx high-entropy alloys is explored as a function of temperature by first-principle theory. Investigating the generalized stacking fault energy, we identify a strong interplay between the magnetic and chemical effects. At cryogenic conditions (ferromagnetic state), full-slip is accompanied by martensitic transformation, whereas increasing temperature towards room-temperature (paramagnetic state) changes the deformation mechanism to full-slip plus twinning. Alloying with Al reduces the susceptibility for stacking fault formation in the ferromagnetic state and promotes twinning in the paramagnetic state. The present advance in magneto-plasticity reveals new opportunities for tailoring the mechanical response in high-entropy alloys. IMPACT STATEMENT: Magnetic state critically affects the γ-surface of FeCrCoNiAlx and is responsible for the emergence of the exceptional metastable twinning phenomena at room temperature.

Place, publisher, year, edition, pages
Taylor & Francis, 2019. Vol. 7, no 11, p. 439-445
Keywords [en]
ab initio calculations, generalized stacking fault energy, High-entropy alloys, TWIP/TRIP effects
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:kth:diva-267892DOI: 10.1080/21663831.2019.1644683Scopus ID: 2-s2.0-85073035370OAI: oai:DiVA.org:kth-267892DiVA, id: diva2:1394070
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QC 20200218

Available from: 2020-02-18 Created: 2020-02-18 Last updated: 2020-02-18Bibliographically approved

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Huang, ShuoLi, WeiVitos, Levente

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