Thick amorphous complexion formation and extreme thermal stability in ternary nanocrystalline Cu-Zr-Hf alloys
Abstract
Building on the recent discovery of tough nanocrystalline Cu-Zr alloys with amorphous intergranular films, this paper investigates ternary nanocrystalline Cu-Zr-Hf alloys with a focus on understanding how alloy composition affects the formation of disordered complexions. Binary Cu-Zr and Cu–Hf alloys with similar initial grain sizes were also fabricated for comparison. The thermal stability of the nanocrystalline alloys was evaluated by annealing at 950 °C (>95% of the solidus temperatures), followed by detailed characterization of the grain boundary structure. All of the ternary alloys exhibited exceptional thermal stability comparable to that of the binary Cu-Zr alloy, and remained nanocrystalline even after two weeks of annealing at this extremely high temperature. Despite carbide formation and growth in these alloys during milling and annealing, the thermal stability of the ternary alloys is mainly attributed to the formation of thick amorphous intergranular films at high temperatures. Our results show that ternary alloy compositions have thicker boundary films compared to the binary alloys with similar global dopant concentrations. While it is not required for amorphous complexion formation, this work shows that having at least three elements present at the interface can lead to thicker grain boundary films, which is expected to maximize the previously reportedmore »
- Authors:
-
- Univ. of California, Irvine, CA (United States). Dept. of Chemical Engineering and Materials Science
- Univ. of California, Irvine, CA (United States). Dept. of Chemical Engineering and Materials Science. Dept. of Mechanical and Aerospace Engineering
- Publication Date:
- Research Org.:
- Univ. of California, Irvine, CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1802591
- Alternate Identifier(s):
- OSTI ID: 1568893
- Grant/Contract Number:
- SC0014232
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Acta Materialia
- Additional Journal Information:
- Journal Volume: 179; Journal ID: ISSN 1359-6454
- Publisher:
- Elsevier
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; nanocrystalline alloys; grain growth; grain-boundary segregation; intergranular films; complexions
Citation Formats
Grigorian, Charlette M., and Rupert, Timothy J. Thick amorphous complexion formation and extreme thermal stability in ternary nanocrystalline Cu-Zr-Hf alloys. United States: N. p., 2019.
Web. doi:10.1016/j.actamat.2019.08.031.
Grigorian, Charlette M., & Rupert, Timothy J. Thick amorphous complexion formation and extreme thermal stability in ternary nanocrystalline Cu-Zr-Hf alloys. United States. https://doi.org/10.1016/j.actamat.2019.08.031
Grigorian, Charlette M., and Rupert, Timothy J. Tue .
"Thick amorphous complexion formation and extreme thermal stability in ternary nanocrystalline Cu-Zr-Hf alloys". United States. https://doi.org/10.1016/j.actamat.2019.08.031. https://www.osti.gov/servlets/purl/1802591.
@article{osti_1802591,
title = {Thick amorphous complexion formation and extreme thermal stability in ternary nanocrystalline Cu-Zr-Hf alloys},
author = {Grigorian, Charlette M. and Rupert, Timothy J.},
abstractNote = {Building on the recent discovery of tough nanocrystalline Cu-Zr alloys with amorphous intergranular films, this paper investigates ternary nanocrystalline Cu-Zr-Hf alloys with a focus on understanding how alloy composition affects the formation of disordered complexions. Binary Cu-Zr and Cu–Hf alloys with similar initial grain sizes were also fabricated for comparison. The thermal stability of the nanocrystalline alloys was evaluated by annealing at 950 °C (>95% of the solidus temperatures), followed by detailed characterization of the grain boundary structure. All of the ternary alloys exhibited exceptional thermal stability comparable to that of the binary Cu-Zr alloy, and remained nanocrystalline even after two weeks of annealing at this extremely high temperature. Despite carbide formation and growth in these alloys during milling and annealing, the thermal stability of the ternary alloys is mainly attributed to the formation of thick amorphous intergranular films at high temperatures. Our results show that ternary alloy compositions have thicker boundary films compared to the binary alloys with similar global dopant concentrations. While it is not required for amorphous complexion formation, this work shows that having at least three elements present at the interface can lead to thicker grain boundary films, which is expected to maximize the previously reported toughening effect.},
doi = {10.1016/j.actamat.2019.08.031},
journal = {Acta Materialia},
number = ,
volume = 179,
place = {United States},
year = {Tue Aug 20 00:00:00 EDT 2019},
month = {Tue Aug 20 00:00:00 EDT 2019}
}
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Works referencing / citing this record:
Amorphous intergranular films mitigate radiation damage in nanocrystalline Cu-Zr
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