Deformation behavior of crystalline/amorphous Al-Si nanocomposites with nanolaminate or nanofibrous microstructures
Abstract
Deformation mechanisms in sputter-deposited crystalline Al/amorphous Si nanocomposites with nanolaminate or nanofibrous morphology are characterized by nanoindentation, micropillar compression testing and transmission electron microscopy (TEM). The nanofibrous composite having crystalline Al nanofibers with ~40–50 nm in length and 15–20 nm in diameter embedded in amorphous Si exhibits strain hardening to a maximum flow stress of 2.9 GPa and no shear band (SB) formation in compression up to plastic strain exceeding 24%. On the other hand, nanolaminate composite that is composed of 80 nm crystalline Al layers and 20 nm amorphous Si layers exhibits catastrophic SBs starting at plastic strains in the range of 5–10%. Cross-sectional TEM of the deformed samples reveals a high density of stacking faults and twin boundaries in Al nanofibers and no microshear bands in the nanofibrous composite, suggesting plastic deformation in amorphous Si phase and crystalline Al nanofibers. Further, molecular dynamics simulations revealed that the plastic deformation in amorphous Si phase in the cosputtered films could be favored by the decrease in flow strength of amorphous Si with increasing Al solute concentration trapped in Si.
- Authors:
-
[1];
[1]
- Univ. of Michigan, Ann Arbor, MI (United States)
- Univ. of Nebraska, Lincoln, NE (United States)
- Publication Date:
- Research Org.:
- Univ. of Michigan, Ann Arbor, MI (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1980353
- Grant/Contract Number:
- SC0016808
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review Materials
- Additional Journal Information:
- Journal Volume: 6; Journal Issue: 9; Journal ID: ISSN 2475-9953
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; Materials Science; Ductility; Hardness; Material failure; Mechanical deformation; Microstructure; Amorphous materials; Nanostructures; Polycrystalline materials; Thin films; Electron microscopy; Indentation; Molecular dynamics; Scanning electron microscopy; Sputtering
Citation Formats
Sahu, Bibhu Prasad, Wu, Wenqian, Wang, Jian, and Misra, Amit. Deformation behavior of crystalline/amorphous Al-Si nanocomposites with nanolaminate or nanofibrous microstructures. United States: N. p., 2022.
Web. doi:10.1103/physrevmaterials.6.094002.
Sahu, Bibhu Prasad, Wu, Wenqian, Wang, Jian, & Misra, Amit. Deformation behavior of crystalline/amorphous Al-Si nanocomposites with nanolaminate or nanofibrous microstructures. United States. https://doi.org/10.1103/physrevmaterials.6.094002
Sahu, Bibhu Prasad, Wu, Wenqian, Wang, Jian, and Misra, Amit. Wed .
"Deformation behavior of crystalline/amorphous Al-Si nanocomposites with nanolaminate or nanofibrous microstructures". United States. https://doi.org/10.1103/physrevmaterials.6.094002. https://www.osti.gov/servlets/purl/1980353.
@article{osti_1980353,
title = {Deformation behavior of crystalline/amorphous Al-Si nanocomposites with nanolaminate or nanofibrous microstructures},
author = {Sahu, Bibhu Prasad and Wu, Wenqian and Wang, Jian and Misra, Amit},
abstractNote = {Deformation mechanisms in sputter-deposited crystalline Al/amorphous Si nanocomposites with nanolaminate or nanofibrous morphology are characterized by nanoindentation, micropillar compression testing and transmission electron microscopy (TEM). The nanofibrous composite having crystalline Al nanofibers with ~40–50 nm in length and 15–20 nm in diameter embedded in amorphous Si exhibits strain hardening to a maximum flow stress of 2.9 GPa and no shear band (SB) formation in compression up to plastic strain exceeding 24%. On the other hand, nanolaminate composite that is composed of 80 nm crystalline Al layers and 20 nm amorphous Si layers exhibits catastrophic SBs starting at plastic strains in the range of 5–10%. Cross-sectional TEM of the deformed samples reveals a high density of stacking faults and twin boundaries in Al nanofibers and no microshear bands in the nanofibrous composite, suggesting plastic deformation in amorphous Si phase and crystalline Al nanofibers. Further, molecular dynamics simulations revealed that the plastic deformation in amorphous Si phase in the cosputtered films could be favored by the decrease in flow strength of amorphous Si with increasing Al solute concentration trapped in Si.},
doi = {10.1103/physrevmaterials.6.094002},
journal = {Physical Review Materials},
number = 9,
volume = 6,
place = {United States},
year = {Wed Sep 07 00:00:00 EDT 2022},
month = {Wed Sep 07 00:00:00 EDT 2022}
}
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