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  • 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. We rationalize these significant changes in the transformation behaviour on the basis of the microstructural development during the heat treatment which is characterized by means of SEM, TEM and EBSD techniques.
  • 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. We rationalize these significant changes in the transformation behaviour on the basis of the microstructural development during the heat treatment which is characterized by means of SEM, TEM and EBSD techniques. (en)
Title
  • Influence of Heat Treatment on Microstructure and Transformation Characteristics of NiTi Shape Memory Wires
  • Influence of Heat Treatment on Microstructure and Transformation Characteristics of NiTi Shape Memory Wires (en)
skos:prefLabel
  • Influence of Heat Treatment on Microstructure and Transformation Characteristics of NiTi Shape Memory Wires
  • Influence of Heat Treatment on Microstructure and Transformation Characteristics of NiTi Shape Memory Wires (en)
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  • RIV/68081723:_____/11:00376018!RIV12-AV0-68081723
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  • P(GA106/09/1913), Z(AV0Z20410507)
http://linked.open...vai/riv/dodaniDat
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  • 204419
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  • RIV/68081723:_____/11:00376018
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  • Ni-rich NiTi shape memory alloys; Superelastic wires; phase transformation temperatures (en)
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  • [528B77BB339E]
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  • Brno
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  • Ostrava
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  • METAL 2011 Conference Proceedings
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  • Dlouhý, Antonín
  • Svoboda, Milan
  • Zálešák, Jakub
  • Čermák, Jiří
  • Kuběnová, Monika
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number of pages
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  • TANGER, spol. s r.o.
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  • 978-80-87294-22-2
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