Journal
SCRIPTA MATERIALIA
Volume 81, Issue -, Pages 12-15Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2014.02.012
Keywords
High-temperature shape memory alloys; NiTiZr; Superelasticity; Precipitation; Microstructure
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Funding
- US Air Force Office of Scientific Research [FA9550-12-1-0218]
- US National Science Foundation [DMR 08-44082]
- International Materials Institute for Multi-functional Materials for Energy Conversion (IIMEC) at Texas AM University
- Spanish MINECO
- FEDER [MAT2011-28217-C02-01]
- NASA Fundamental Aeronautics Program, Aeronautical Sciences Project
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [0844082] Funding Source: National Science Foundation
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The microstructure and superelastic response of a Ni50.3Ti29.7Zr20 high-temperature shape memory alloy were studied. The alloy exhibited a recoverable strain level of 5% at 170 degrees C and near-perfect superelasticity up to 250 degrees C under 3% applied strain when fine precipitates were present. In this case, large martensite variants easily formed during the stress-induced martensitic transformation while dislocation motion was impeded. In contrast, poor superelastic response was obtained in samples containing large particles that constrain martensite formation to channels between elongated precipitates. (C) 2014 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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