Journal
SCRIPTA MATERIALIA
Volume 127, Issue -, Pages 186-190Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2016.09.023
Keywords
High entropy alloys; Complex concentrated alloys; Microscopy; Thermodynamic modeling; Lens
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Funding
- National Research Foundation-Prime Minister's office, Republic of Singapore
- DGA (Direction Generale de l'Armement) through the ERE programme [ERE 2015 60 0013]
- United Technology Corporation (UTC)
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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 + L1(2) 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. (C) 2016 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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