Amorphous complexions alter the tensile failure of nanocrystalline Cu-Zr alloys
Abstract
Grain boundary-based mechanisms are known to control the plastic deformation and failure of nanocrystalline metals, with manipulation of the boundary structure a promising path for tuning this response. In this study, the role of interfacial structural disorder on plasticity and failure of nanocrystalline Cu-Zr alloys is investigated with in situ scanning electron microscopy tensile deformation experiments. Two model materials are created, one with only the typical ordered grain boundaries and another with amorphous intergranular films interspersed into the boundary network, while the microstructures are otherwise identical. Hence, the importance of complexion type on plasticity and failure is isolated by only varying complexion structure. Here, the tensile experiments show that failure of the samples containing amorphous films is significantly retarded, as evidenced by an increase in the cross-sectional area reduction, a decrease in the occurrence of shear-dominated failure, a decrease in strain localization, and fracture surfaces with more elongated dimple features. As a whole, this study provides direct evidence that structural disorder at the grain boundaries can be beneficial for improving the ductility of nanocrystalline metals.
- 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 Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1811699
- Alternate Identifier(s):
- OSTI ID: 1786553
- Grant/Contract Number:
- SC0021224
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Materialia
- Additional Journal Information:
- Journal Volume: 17; Journal ID: ISSN 2589-1529
- Publisher:
- Elsevier
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; Nanocrystalline metals; Plasticity; Complexions; In situ mechanical testing
Citation Formats
Wardini, Jenna L., Grigorian, Charlette M., and Rupert, Timothy J. Amorphous complexions alter the tensile failure of nanocrystalline Cu-Zr alloys. United States: N. p., 2021.
Web. doi:10.1016/j.mtla.2021.101134.
Wardini, Jenna L., Grigorian, Charlette M., & Rupert, Timothy J. Amorphous complexions alter the tensile failure of nanocrystalline Cu-Zr alloys. United States. https://doi.org/10.1016/j.mtla.2021.101134
Wardini, Jenna L., Grigorian, Charlette M., and Rupert, Timothy J. Sat .
"Amorphous complexions alter the tensile failure of nanocrystalline Cu-Zr alloys". United States. https://doi.org/10.1016/j.mtla.2021.101134. https://www.osti.gov/servlets/purl/1811699.
@article{osti_1811699,
title = {Amorphous complexions alter the tensile failure of nanocrystalline Cu-Zr alloys},
author = {Wardini, Jenna L. and Grigorian, Charlette M. and Rupert, Timothy J.},
abstractNote = {Grain boundary-based mechanisms are known to control the plastic deformation and failure of nanocrystalline metals, with manipulation of the boundary structure a promising path for tuning this response. In this study, the role of interfacial structural disorder on plasticity and failure of nanocrystalline Cu-Zr alloys is investigated with in situ scanning electron microscopy tensile deformation experiments. Two model materials are created, one with only the typical ordered grain boundaries and another with amorphous intergranular films interspersed into the boundary network, while the microstructures are otherwise identical. Hence, the importance of complexion type on plasticity and failure is isolated by only varying complexion structure. Here, the tensile experiments show that failure of the samples containing amorphous films is significantly retarded, as evidenced by an increase in the cross-sectional area reduction, a decrease in the occurrence of shear-dominated failure, a decrease in strain localization, and fracture surfaces with more elongated dimple features. As a whole, this study provides direct evidence that structural disorder at the grain boundaries can be beneficial for improving the ductility of nanocrystalline metals.},
doi = {10.1016/j.mtla.2021.101134},
journal = {Materialia},
number = ,
volume = 17,
place = {United States},
year = {Sat May 29 00:00:00 EDT 2021},
month = {Sat May 29 00:00:00 EDT 2021}
}
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