Insights into Defect-Mediated Nucleation of the Equilibrium B2 Phase in Face-Centered Cubic High-Entropy Alloys

Sharma, Abhishek; Gwalani, Bharat; Dasari, Sriswaroop; Choudhuri, Deep; Chang, Yao-Jen; Gorsse, Stéphane; Yeh, A C.; Banerjee, Rajarshi

doi:10.1007/s11837-021-04754-3

Insights into Defect-Mediated Nucleation of the Equilibrium B2 Phase in Face-Centered Cubic High-Entropy Alloys

Journal Article · 02 August 2021 · JOM. The Journal of the Minerals, Metals and Materials Society

DOI:https://doi.org/10.1007/s11837-021-04754-3· OSTI ID:1814491

Sharma, Abhishek ^[1]; ^[2]; Dasari, Sriswaroop ^[1]; Choudhuri, Deep ^[1]; Chang, Yao-Jen ^[3]; Gorsse, Stéphane ^[4]; Yeh, A C. ^[5]; Banerjee, Rajarshi ^[1]

University of North Texas
BATTELLE (PACIFIC NW LAB)
National Tsing Hua University
Univ. Bordeaux, CNRS, Bordeaux INP, ICMCB, UMR 5026, F-33600 Pessac, France
Tsinghua University

A fine scale second phase distribution is important for strengthening metallic materials. High precipitate density is often difficult to achieve due to sluggish precipitation kinetics and limited nucleation sites. Based on the CALPHAD predictions, transition element-based complex concentrated alloys (CCAs)/ High Entropy Alloys (HEAs), have a highly stable face-centered cubic (FCC) phase and intermetallic B2 phase. The precipitation of the strengthening B2 phase is often limited to low fractions in these alloys due to a high nucleation barrier in the FCC matrix. Here, by illustrating in three different alloys, we present a defect mediated nucleation of a high fraction equilibrium B2 phase. The degree of cold work is used to manipulate the phase fraction, morphology, and distribution of B2 precipitates. Our approach synergistically improves the strength and ductility of these alloys and is widely applicable to many other complex alloys.

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

Sponsoring Organization:: USDOE

DOE Contract Number:: AC05-76RL01830

OSTI ID:: 1814491

Report Number(s):: PNNL-SA-161146

Journal Information:: JOM. The Journal of the Minerals, Metals and Materials Society, Vol. 73, Issue 8

Country of Publication:: United States

Language:: English

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