Change in the primary solidification phase from fcc to bcc-based B2 in high entropy or complex concentrated alloys

Abstract : An examination of a compositionally graded AlxCuCrFeNi2 high entropy alloy (HEA) or complex concentrated alloy (CCA), revealed that marginally increasing Al content from x = 0.8 to x = 1.0 (+ 6 at.%) changes the primary solidification phase from a simple disordered-fcc to a bcc-based ordered-B2 phase. Subsequently, a second solidification product forms, a disordered-bcc in case of x = 0.8 and a disordered-fcc in case of x = 1.0. Solid-state decomposition within these phases results in fcc + L12 and bcc + B2 products, accompanied by compositional partitioning. These results provide new insights into the influence of Al on the primary solidification product, and have been rationalized using a computational thermodynamic approach.
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Article dans une revue
Scripta Materialia, Elsevier, 2017, 127, pp.186-190. 〈10.1016/j.scriptamat.2016.09.023〉
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https://hal.archives-ouvertes.fr/hal-01416187
Contributeur : Stéphane Toulin <>
Soumis le : mercredi 14 décembre 2016 - 10:37:34
Dernière modification le : mercredi 2 mai 2018 - 18:23:32

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D. Choudhuri, B. Gwalani, C. V. Mikler, R.V. Ramanujan, Stéphane Gorsse, et al.. Change in the primary solidification phase from fcc to bcc-based B2 in high entropy or complex concentrated alloys. Scripta Materialia, Elsevier, 2017, 127, pp.186-190. 〈10.1016/j.scriptamat.2016.09.023〉. 〈hal-01416187〉

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