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Title: Critical cooling rates for amorphous-to-ordered complexion transitions in Cu-rich nanocrystalline alloys

Abstract

Amorphous complexions in nanocrystalline metals have the potential to improve mechanical properties and radiation tolerance, as well as resistance to grain growth. In this study, the stability of amorphous complexions in binary and ternary Cu-based alloys is investigated by observing the effect of cooling rate from high temperature on the occurrence of amorphous-to-ordered complexion transitions. Bulk Cu-Zr and Cu-Zr-Hf alloy samples were annealed to induce boundary premelting and then quenched through a procedure that induces a gradient of local cooling rate through the sample height. Amorphous complexion thickness distributions were found to be invariant to local cooling rate in the Cu-Zr-Hf alloy, demonstrating enhanced stability of the amorphous complexion structure compared to the Cu-Zr alloy, which had thinner amorphous complexions in the regions that were slowly cooled. The experimental results are used to construct time-temperature-transformation diagrams for the amorphous-to-ordered complexion transition in both the binary and ternary alloys, enabling a deeper understanding of the influence of cooling rate and grain boundary chemistry on complexion transitions. The critical cooling rate necessary to avoid complexion transitions in the ternary alloy is found to be at least three orders of magnitude slower than that for the binary alloy.

Authors:
 [1];  [1]
  1. Univ. of California, Irvine, CA (United States)
Publication Date:
Research Org.:
Univ. of California, Irvine, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division; USDOE
OSTI Identifier:
1763054
Alternate Identifier(s):
OSTI ID: 1778920; OSTI ID: 1780369
Grant/Contract Number:  
SC0021224
Resource Type:
Accepted Manuscript
Journal Name:
Acta Materialia
Additional Journal Information:
Journal Volume: 206; Journal ID: ISSN 1359-6454
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; Complexions; Interfacial films; Nanocrystalline alloys; Grain-boundary segregation induced phase transformation

Citation Formats

Grigorian, Charlette M., and Rupert, Timothy J. Critical cooling rates for amorphous-to-ordered complexion transitions in Cu-rich nanocrystalline alloys. United States: N. p., 2021. Web. doi:10.1016/j.actamat.2021.116650.
Grigorian, Charlette M., & Rupert, Timothy J. Critical cooling rates for amorphous-to-ordered complexion transitions in Cu-rich nanocrystalline alloys. United States. https://doi.org/10.1016/j.actamat.2021.116650
Grigorian, Charlette M., and Rupert, Timothy J. Fri . "Critical cooling rates for amorphous-to-ordered complexion transitions in Cu-rich nanocrystalline alloys". United States. https://doi.org/10.1016/j.actamat.2021.116650. https://www.osti.gov/servlets/purl/1763054.
@article{osti_1763054,
title = {Critical cooling rates for amorphous-to-ordered complexion transitions in Cu-rich nanocrystalline alloys},
author = {Grigorian, Charlette M. and Rupert, Timothy J.},
abstractNote = {Amorphous complexions in nanocrystalline metals have the potential to improve mechanical properties and radiation tolerance, as well as resistance to grain growth. In this study, the stability of amorphous complexions in binary and ternary Cu-based alloys is investigated by observing the effect of cooling rate from high temperature on the occurrence of amorphous-to-ordered complexion transitions. Bulk Cu-Zr and Cu-Zr-Hf alloy samples were annealed to induce boundary premelting and then quenched through a procedure that induces a gradient of local cooling rate through the sample height. Amorphous complexion thickness distributions were found to be invariant to local cooling rate in the Cu-Zr-Hf alloy, demonstrating enhanced stability of the amorphous complexion structure compared to the Cu-Zr alloy, which had thinner amorphous complexions in the regions that were slowly cooled. The experimental results are used to construct time-temperature-transformation diagrams for the amorphous-to-ordered complexion transition in both the binary and ternary alloys, enabling a deeper understanding of the influence of cooling rate and grain boundary chemistry on complexion transitions. The critical cooling rate necessary to avoid complexion transitions in the ternary alloy is found to be at least three orders of magnitude slower than that for the binary alloy.},
doi = {10.1016/j.actamat.2021.116650},
journal = {Acta Materialia},
number = ,
volume = 206,
place = {United States},
year = {Fri Jan 15 00:00:00 EST 2021},
month = {Fri Jan 15 00:00:00 EST 2021}
}

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