About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
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Symposium
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Mechanical Response of Materials Investigated through Novel In-situ Experiments and Modeling
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Presentation Title |
Understanding the Unique Thermal and Mechanical Properties of Nanotwinned Ni-Mo-W Alloys |
Author(s) |
Mo-Rigen He, Gianna Valentino, Arunima Banerjee, Jessica Krogstad, Kevin Hemker |
On-Site Speaker (Planned) |
Mo-Rigen He |
Abstract Scope |
Sputter-deposited Ni-Mo-W thin films are recently developed and shown to possess a unique suite of properties, including abnormally low thermal expansion, superior microstructural stability, and ultrahigh mechanical strength, altogether making them a promising candidate material for high-temperature microelectromechanical systems. However, the fundamental mechanisms underpinning these outstanding performances remain to be elucidated. These materials are composed of textured grains densely packed with ultrafine (< 5 nm) nanotwins, which put forth a strong demand for in situ testing and characterization at very small length scales. In this study, Ni-Mo-W alloys with varied Ni/(Mo+W) and Mo/W ratios are tested with in situ heating and pillar compression inside TEM. Based on strain measurements and crystal orientation mapping that are performed in situ and with sub-nm resolution, we try to clarify the factors (e.g., alloy composition, twin spacing, interfacial defects) that modulate elastic/plastic strain fields and control microstructural evolution in these unique family of materials. |
Proceedings Inclusion? |
Planned: |
Keywords |
Characterization, High-Temperature Materials, Thin Films and Interfaces |