CHOUDHURI, D.; GWALANI, B.; MIKLER, C. V.; RAMANUJAN, R.V.; GORSSE, Stéphane; GIBSON, M. A.; BANERJEE, R.

doi:10.1016/j.scriptamat.2016.09.023

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CHOUDHURI, D.
Department of Materials Science and Engineering

GWALANI, B.
Department of Materials Science and Engineering
Advanced Materials and Manufacturing Processes Institute

MIKLER, C. V.
Department of Materials Science and Engineering

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Scripta Materialia. 2017, vol. 127, p. 186–190

Elsevier

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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.< Réduire

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High entropy alloys

Complex concentrated alloys

Microscopy

Thermodynamic modeling

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

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