Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 627, Issue -, Pages 82-94Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2014.12.111
Keywords
NiTiHfCu alloys; Phase transformation; TWSME; Shape memory effect; Shape memory alloys
Categories
Funding
- NASA Fundamental Aeronautics Program
- Aeronautical Sciences and Transformational Tools & Technologies Projects (Technical Discipline Lead Dale Hopkins)
- NASA EPSCOR program [NNX11AQ31A]
- NASA Kentucky Space Grant Consortium [516171-10-165]
- RSF Grant [14-29-00012]
- Deutsche Forschungsgemeinschaft [FOR 1766]
- Russian Science Foundation [14-29-00012] Funding Source: Russian Science Foundation
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Effects of heat treatment temperature and time on the microstructure and shape memory behaviors (e.g. transformation temperatures, load-biased shape memory effect, superelasticity, two-way shape memory effect, and related properties) were investigated in a Ni45.3Ti29.7Hf20Cu5 (at%) high temperature polycrystalline shape memory alloy. Heat treatments could be used to control the Us and to a lesser extent recoverable and irrecoverable strains. The Ni45.3Ti29.7Hf20Cu5 alloy was capable of recovering shape memory strains of up to 2% at temperatures above 100 degrees C under high compressive stresses (700 MPa) and up to 0.8% TWSME strain was possible after a non-intense stress-cycling training process. However, due to high Clausius-Clapeyron slopes, large temperature hysteresis, and a strong dependence of transformation stress on temperature, fully recoverable superelastic behavior was not observed because plastic deformation occurred concurrently with the stress-induced martensitic transformation. (C) 2015 Elsevier B.V. All rights reserved.
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