About this Abstract |
Meeting |
2021 TMS Annual Meeting & Exhibition
|
Symposium
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Heterostructured and Gradient Materials (HGM IV): Tailoring Heterogeneity for Superior Properties
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Presentation Title |
Synthesis and Mechanical Characterization of Metallic Films with Precisely Defined Heterogeneous Microstructures |
Author(s) |
Rohit Berlia, Jagannathan Rajagopalan |
On-Site Speaker (Planned) |
Jagannathan Rajagopalan |
Abstract Scope |
Materials with heterogeneous microstructures exhibit a superior combination of strength and ductility, but our ability to synthesize such materials with rigorously microstructural control is still limited. Here we report a novel technique to synthesize metallic films with precisely defined bimodal microstructures, wherein the size, volume fraction and connectivity of nanocrystalline (NC) and single crystal (SC) domains can be explicitly controlled. Using this technique, we synthesized iron films in which NC and SC domains were configured in series and parallel arrangements, and explored their stress-strain behavior. As anticipated, films with parallel arrangement exhibited higher strength due to co-deformation of NC and SC domains. More interestingly, the orientation of SC domains with respect to the loading axis significantly influenced the stress-strain response due to the constraints it imposed on dislocation motion. This synthesis method provides a route to systematically tailor the mechanical behavior of metallic films in a highly reproducible manner. |
Proceedings Inclusion? |
Planned: |
Keywords |
Mechanical Properties, Characterization, Thin Films and Interfaces |