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

  • Defect and Phase Transformation Pathway Engineering for Desired Microstructures
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Abstract

Though a fine-scale second-phase distribution is a potent strengthening mechanism for alloys, achieving a high precipitate density is often difficult owing to sluggish precipitation kinetics and limited nucleation sites. More specifically, in case of transition-element-based complex concentrated alloys (CCAs) or high-entropy alloys (HEAs), precipitation of the equilibrium strengthening phase, such as the ordered B2 phase, can be limited due to its high nucleation barrier for homogeneous precipitation within the face-centered cubic (FCC) matrix. This can lead to competing homogeneous nucleation of a metastable ordered L12 phase, which has a substantially lower nucleation barrier since it is isostructural with the FCC matrix. Using three different CCAs/HEAs as examples, thermomechanical processing has been employed to introduce a large number density of homogeneously distributed heterogeneous nucleation sites within the FCC matrix, to manipulate the phase fraction, morphology, and distribution of B2 precipitates. This approach of tailoring the microstructure is widely applicable to other multicomponent alloys.

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Acknowledgements

The work was supported by the US Air Force Office of Scientific Research under grant FA9550-17-1-0395. The authors acknowledge the Materials Research Facility (MRF) at the University of North Texas for accessing microscopy and characterization facilities. B.G. acknowledges support by Pacific Northwest National Laboratory’s (PNNL) open call laboratory directed research and development (LDRD) program. PNNL is a multiprogram national laboratory operated by Battelle for the US DOE under contract DE-AC05-76RL01830.

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Author notes

  1. Deep Choudhuri

    Present address: New Mexico Institute of Mining and Technology, 801 Leroy PI, Socorro, NM, 87801, USA

Authors and Affiliations

  1. Department of Materials Science and Engineering, University of North Texas, Denton, TX, 76191, USA

    Abhishek Sharma, Sriswaroop Dasari, Deep Choudhuri & Rajarshi Banerjee

  2. Physical and Computational Sciences Directorate, Pacific Northwest National Laboratory, 902 Battelle Blvd, Richland, WA, 99352, USA

    Bharat Gwalani

  3. Department of Materials Science and Engineering, National Tsing Hua University, 101, Sec. 2, Kuang-Fu Road, Hsinchu, 30013, Taiwan

    Yao-Jen Chang & An-Chou Yeh

  4. High Entropy Materials Center, National Tsing Hua University, 101, Sec. 2, Kuang-Fu Road, Hsinchu, 30013, Taiwan

    Yao-Jen Chang & An-Chou Yeh

  5. CNRS, Univ. Bordeaux, Bordeaux INP, ICMCB, UMR 5026, 33600, Pessac, France

    Stephane Gorsse

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  1. Abhishek Sharma
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Correspondence to Abhishek Sharma or Rajarshi Banerjee.

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Sharma, A., Gwalani, B., Dasari, S. et al. Insights into Defect-Mediated Nucleation of Equilibrium B2 Phase in Face-Centered Cubic High-Entropy Alloys. JOM 73, 2320–2331 (2021). https://doi.org/10.1007/s11837-021-04754-3

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  • DOI: https://doi.org/10.1007/s11837-021-04754-3

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