About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
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Symposium
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Deformation Mechanisms, Microstructure Evolution, and Mechanical Properties of Nanoscale Materials
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Presentation Title |
Deformation Behavior of the Crystalline/Amorphous Al/Si Nanocomposite Having Nanolaminate and Nano-fiber Morphology |
Author(s) |
Bibhu Prasad Prasad Sahu, Wenqian Wu, Jian Wang, Amit Misra |
On-Site Speaker (Planned) |
Bibhu Prasad Prasad Sahu |
Abstract Scope |
The deformation mechanism in crystalline Al / amorphous Si nanocomposite sputtered thin films are compared for nanolaminate and nanofibrous morphologies. Nanocomposite morphology of crystalline Al nanofibers, approximately 40-50 nm in length and 15-20 nm in diameter and 20 nm spacing, embedded in amorphous Si are shown to suppress shear band formation, in compression, to plastic strains exceeding 24% and exhibit strain hardening to a maximum flow stress of 2.9 GPa. Nanolaminate morphology, 80 nm crystalline Al - 20 nm amorphous Si, exhibits catastrophic shear bands starting at plastic strains of ≈14%. In the nanolaminate morphology, shear bands with brittle fracture in Si are observed. In the nano-fibrous morphology, cross-sectional transmission electron microscopy of the deformed samples reveals a high density of stacking faults and nanotwins in Al nanofibers and no micro-shear bands in the fibrous morphology suggesting plastic co-deformability. |
Proceedings Inclusion? |
Planned: |
Keywords |
Thin Films and Interfaces, Mechanical Properties, Characterization |