Journal
SCRIPTA MATERIALIA
Volume 204, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2021.114137
Keywords
High entropy alloys; Complex concentrated alloys; Eutectic microstructure; Widmanstatten; Intermetallic precipitates
Categories
Funding
- US Air Force Office of Scien-tific Research [FA9550-17-1-0395]
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This study reveals that the alternating FCC and BCC lamellar microstructure in the Al0.7CoCrFeNi high entropy alloy is a result of non-equilibrium partitionless solidification followed by solid-state decomposition. Isothermal annealing further drives these individual sub-systems towards equilibrium via precipitation of ordered intermetallic phases. The transformation in FCC lamellae initiates by the formation of metastable L1(2) precipitates at shorter annealing times, which are eventually replaced by the equilibrium BCC and B2 phases.
Guided by solution thermodynamic modeling coupled with detailed experimental characterization, the present study establishes that the alternating FCC and BCC lamellar microstructure in the Al0.7CoCrFeNi high entropy alloy, is a result of non-equilibrium partitionless solidification from the liquid to single B2 phase, followed by solid-state decomposition. Widmanstatten FCC lamellae form from the allotriomorphic FCC precipitates at the B2 grain boundaries, leading to a lamellar microstructure, divided into two distinct sub-systems. Isothermal annealing further drives these individual sub-systems towards equilibrium via precipitation of ordered intermetallic phases. The transformation in FCC lamellae initiates by the formation of metastable L1(2) precipitates at shorter annealing times, which are eventually replaced by the equilibrium BCC and B2 phases, forming composite B2+BCC laths, on long term annealing. These results further exemplify that interesting transformation pathways lead to hierarchical microstructures within HEAs, and the fact that as processed conditions in these alloys are often far-from equilibrium. (C) 2021 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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