Hierarchical Eutectoid Nano-lamellar Decomposition in an Al0.3CoFeNi Complex Concentrated Alloy

Dasari, Sriswaroop; Gwalani, Bharat; Jagetia, Abhinav; Soni, Vishal; Gorsse, Stéphane; Banerjee, Rajarshi

doi:10.1038/s41598-020-61538-6

Title: Hierarchical Eutectoid Nano-lamellar Decomposition in an Al_0.3CoFeNi Complex Concentrated Alloy

Journal Article · Mon Mar 16 00:00:00 EDT 2020 · Scientific Reports

DOI:https://doi.org/10.1038/s41598-020-61538-6· OSTI ID:1734876

Dasari, Sriswaroop ^[1];

^[2]; Jagetia, Abhinav ^[1]; Soni, Vishal ^[1]; Gorsse, Stéphane ^[3]; Banerjee, Rajarshi ^[1]

Univ. of North Texas, Denton, TX (United States)
Univ. of North Texas, Denton, TX (United States); Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Univ. Bordeaux, Pessac (France)

This paper reports a novel eutectoid nano-lamellar (FCC + L1₂)/(BCC + B2) microstructure that has been discovered in a relatively simple Al_0.3CoFeNi high entropy alloy (HEA) or complex concentrated alloy (CCA). This novel eutectoid nano-lamellar microstructure presumably results from the complex interplay between Al-mediated lattice distortion (due to its larger atomic radius) in a face-centered cubic (FCC) CoFeNi solid solution, and a chemical ordering tendency leading to precipitation of ordered phases such as L1₂ and B2. This eutectoid microstructure is a result of solid-state decomposition of the FCC matrix and therefore distinct from the commonly reported eutectic microstructure in HEAs which results from solidification. This novel nano-lamellar microstructure exhibits a tensile yield strength of 1074 MPa with a reasonable ductility of 8%. The same alloy can be tuned to form a more damage-tolerant FCC + B2 microstructure, retaining high tensile yield stress (~900 MPa) with appreciable tensile ductility (>20%), via annealing at 700 °C. Such tunability of microstructures with dramatically different mechanical properties can be effectively engineered in the same CCA, by exploiting the complex interplay between ordering tendencies and lattice distortion.

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Research Organization:: Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)

Sponsoring Organization:: USDOE; US Air Force Office of Scientific Research (AFOSR)

Grant/Contract Number:: AC05-76RL01830; FA9550-17-1-0395

OSTI ID:: 1734876

Report Number(s):: PNNL-SA-147774

Journal Information:: Scientific Reports, Vol. 10, Issue 1; ISSN 2045-2322

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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Title: Hierarchical Eutectoid Nano-lamellar Decomposition in an Al_0.3CoFeNi Complex Concentrated Alloy