Details
| Original language | English |
|---|---|
| Pages (from-to) | 1503-1513 |
| Number of pages | 11 |
| Journal | International Journal of Materials Research |
| Volume | 101 |
| Issue number | 12 |
| Publication status | Published - Dec 2010 |
| Externally published | Yes |
Abstract
This paper reports on the role of repeated stress-induced martensite transformations at different temperatures (referred to as "training") on the pseudoelasticity and microstructural evolution of as-grown Co 49Ni21Ga30 [001]-oriented shape memory alloy single crystals under compression. The training resulted in a reduction in transformation stress levels and a stable microstructure with a multi-variant configuration reducing the observed transformation strains. Training also improved the recoverability giving way to a large pseudoelastic temperature window of 400 °C. In-situ microscopy revealed the martensite stabilization to be due to pinning of moving interfaces especially at temperatures above 120°C. An insight into the evolution of microstructure and stress-strain behavior in terms of stress hysteresis changes with test temperature is provided, and the possible operant mechanisms are discussed.
Keywords
- DIC, High-temperature pseudoelasticity, High-temperature shape memory alloys, Martensite stabilization, Stress-induced martensite
ASJC Scopus subject areas
- Physics and Astronomy(all)
- Condensed Matter Physics
- Chemistry(all)
- Physical and Theoretical Chemistry
- Materials Science(all)
- Metals and Alloys
- Materials Science(all)
- Materials Chemistry
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In: International Journal of Materials Research, Vol. 101, No. 12, 12.2010, p. 1503-1513.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - High-temperature in-situ microscopy during stress-induced phase transformations in Co49Ni21Ga30 shape memory alloy single crystals
AU - Dadda, Jayaram
AU - Maier, Hans Jürgen
AU - Karaman, Ibrahim
AU - Chumlyakov, Yuri
PY - 2010/12
Y1 - 2010/12
N2 - This paper reports on the role of repeated stress-induced martensite transformations at different temperatures (referred to as "training") on the pseudoelasticity and microstructural evolution of as-grown Co 49Ni21Ga30 [001]-oriented shape memory alloy single crystals under compression. The training resulted in a reduction in transformation stress levels and a stable microstructure with a multi-variant configuration reducing the observed transformation strains. Training also improved the recoverability giving way to a large pseudoelastic temperature window of 400 °C. In-situ microscopy revealed the martensite stabilization to be due to pinning of moving interfaces especially at temperatures above 120°C. An insight into the evolution of microstructure and stress-strain behavior in terms of stress hysteresis changes with test temperature is provided, and the possible operant mechanisms are discussed.
AB - This paper reports on the role of repeated stress-induced martensite transformations at different temperatures (referred to as "training") on the pseudoelasticity and microstructural evolution of as-grown Co 49Ni21Ga30 [001]-oriented shape memory alloy single crystals under compression. The training resulted in a reduction in transformation stress levels and a stable microstructure with a multi-variant configuration reducing the observed transformation strains. Training also improved the recoverability giving way to a large pseudoelastic temperature window of 400 °C. In-situ microscopy revealed the martensite stabilization to be due to pinning of moving interfaces especially at temperatures above 120°C. An insight into the evolution of microstructure and stress-strain behavior in terms of stress hysteresis changes with test temperature is provided, and the possible operant mechanisms are discussed.
KW - DIC
KW - High-temperature pseudoelasticity
KW - High-temperature shape memory alloys
KW - Martensite stabilization
KW - Stress-induced martensite
UR - http://www.scopus.com/inward/record.url?scp=78650489868&partnerID=8YFLogxK
U2 - 10.3139/146.110427
DO - 10.3139/146.110427
M3 - Article
AN - SCOPUS:78650489868
VL - 101
SP - 1503
EP - 1513
JO - International Journal of Materials Research
JF - International Journal of Materials Research
SN - 1862-5282
IS - 12
ER -