Influence of Heat Treatment on Microstructure and Transformation Characteristics of NiTi Shape Memory Wires

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68081723%3A_____%2F11%3A00376018" target="_blank" >RIV/68081723:_____/11:00376018 - isvavai.cz</a>
Result on the web
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DOI - Digital Object Identifier
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Result language
angličtina
Original language name
Influence of Heat Treatment on Microstructure and Transformation Characteristics of NiTi Shape Memory Wires
Original language description
The present study shows how heat treatments affect microstructure and transformation behaviour of superelastic Ni-rich NiTi shape memory wires. Wire samples were sealed into quartz tubes, filled with hydrogen reduction atmosphere, heated for 10 minutes at temperatures increasing in a range from 500 to 600°C and subsequently quenched into cold water. Characteristic transformation temperatures MS, MF, AS, AF, thermal hysteresis and latent heats were investigated using differential scanning calorimetry (DSC). We observed significant changes in DSC charts which recorded B2 R and R B19 phase martensitic transformations. Increasing temperature of the heat treatment resulted in a convergence of the two transformation peaks. R-transformation commenced at systematically lower temperatures and the beginning of the B19 transformation was shifted to higher temperatures with increasing temperature of the heat treatment. In parallel, latent heat of the overall B2 B19 transformation clearly increases
Czech name
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Czech description
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Project
<a href="/en/project/GA106%2F09%2F1913" target="_blank" >GA106/09/1913: Martensitic transformations in NiTi alloys</a><br>
Continuities
Z - Vyzkumny zamer (s odkazem do CEZ)

Publication year
2011
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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