Details
| Original language | English |
|---|---|
| Pages (from-to) | 82-94 |
| Number of pages | 13 |
| Journal | Materials Science and Engineering A |
| Volume | 627 |
| Publication status | Published - 6 Jan 2015 |
Abstract
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 TTs 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°C under high compressive stresses (700MPa) 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.
Keywords
- NiTiHfCu alloys, Phase transformation, Shape memory alloys, Shape memory effect, TWSME
ASJC Scopus subject areas
- Materials Science(all)
- General Materials Science
- Physics and Astronomy(all)
- Condensed Matter Physics
- Engineering(all)
- Mechanics of Materials
- Engineering(all)
- Mechanical Engineering
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In: Materials Science and Engineering A, Vol. 627, 06.01.2015, p. 82-94.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Microstructure and transformation related behaviors of a Ni45.3Ti29.7Hf20Cu5 high temperature shape memory alloy
AU - Karaca, H. E.
AU - Acar, E.
AU - Ded, G. S.
AU - Saghaian, S. M.
AU - Basaran, B.
AU - Tobe, H.
AU - Kok, M.
AU - Maier, H. J.
AU - Noebe, R. D.
AU - Chumlyakov, Y. I.
N1 - Funding information: This work was supported in part by the NASA Fundamental Aeronautics Program, and Aeronautical Sciences and Transformational Tools & Technologies Projects (Technical Discipline Lead Dale Hopkins), the NASA EPSCOR program under Grant NNX11AQ31A , the NASA Kentucky Space Grant Consortium 516171-10-165 and RSF Grant 14-29-00012 . HJM acknowledges financial support from Deutsche Forschungsgemeinschaft ( FOR 1766 ).
PY - 2015/1/6
Y1 - 2015/1/6
N2 - 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 TTs 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°C under high compressive stresses (700MPa) 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.
AB - 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 TTs 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°C under high compressive stresses (700MPa) 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.
KW - NiTiHfCu alloys
KW - Phase transformation
KW - Shape memory alloys
KW - Shape memory effect
KW - TWSME
UR - http://www.scopus.com/inward/record.url?scp=84921315865&partnerID=8YFLogxK
U2 - 10.1016/j.msea.2014.12.111
DO - 10.1016/j.msea.2014.12.111
M3 - Article
AN - SCOPUS:84921315865
VL - 627
SP - 82
EP - 94
JO - Materials Science and Engineering A
JF - Materials Science and Engineering A
SN - 0921-5093
ER -