Change in the primary solidification phase from fcc to bcc-based B2 in high entropy or complex concentrated alloys. (15th January 2017)

• Record Type: Journal Article
• Authors: Choudhuri, D.; Gwalani, B.; Gorsse, S.; Mikler, C.V.; Ramanujan, R.V.; Gibson, M.A.; Banerjee, R.
• Is Part Of: Scripta materialia. Volume 127(2017)
• Page Start: 186
• Page End: 190
• Publication Date: 2017-01-15
• Subjects: High entropy alloys -- Complex concentrated alloys -- Microscopy -- Thermodynamic modeling -- Lens; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2016.09.023
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: An examination of a compositionally graded Alx CuCrFeNi2 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. Graphical abstract: