About this Abstract |
Meeting |
2022 TMS Annual Meeting & Exhibition
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Symposium
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Advances in Multi-Principal Elements Alloys X: Structures and Modeling
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Presentation Title |
Transformation Behavior and Superelasticity of TiZrHfNiCoCu Multi-component High-temperature Shape Memory Alloys |
Author(s) |
Izaz Ur Rehman, Tae-Hyun Nam |
On-Site Speaker (Planned) |
Izaz Ur Rehman |
Abstract Scope |
Multi-component high-temperature shape memory alloys (HTSMAs) with nominal compositions of (TiZrHf)50Ni25Co10Cu15, (TiZrHf)50.5Ni24.834Co9.834Cu14.834, (TiZrHf)51Ni24.667Co9.667Cu14.667 and (TiZrHf)52Ni24.333Co9.333Cu14.333 (at.%) were prepared by arc-melting. Microstructures, transformation temperatures, phase constituents and superelasticity were investigated by scanning electron microscope observation, differential scanning calorimetery, X-ray diffraction and dynamic mechanical analysis in tensile mode, respectively. The microstructure of solution treated TiZrHfNiCoCu HTSMAs specimens consisted of (TiZrHf)(NiCoCu)-type matrix and (TiZrHf)2(NiCoCu)-type second phase. The area fraction of the second phase increased from 1.7% to 17.2% with the increased in (TiZrHf) content from 50 at.% to 52 at.%. Martensitic transformation start temperature of the solution treated specimens increased from 53.5 °C to 188.7 °C with the increase in (TiZrHf) content from 50 at.% to 52 at.%. TiZrHfNiCoCu HTSMAs showed clear superelasticity in the solution treated state. The superelastic recovery strain of solution treated TiZrHfNiCoCu HTSMAs was in the range of 4.2-4.6% depending on the alloy composition. |
Proceedings Inclusion? |
Planned: TMS Journal: Metallurgical and Materials Transactions |
Keywords |
High-Temperature Materials, Phase Transformations, |