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J. Phys. IV France
Volume 05, Numéro C2, Février 1995
IIIrd European Symposium on Martensitic Transformations
Page(s) C2-205 - C2-210
IIIrd European Symposium on Martensitic Transformations

J. Phys. IV France 05 (1995) C2-205-C2-210

DOI: 10.1051/jp4:1995232

Effect of Deformation and Thermal Treatment of NiTi Alloy on Transition Sequence

H. Morawiec, D. Stróz and D. Chrobak

Institute of Physics and Chemistry of Metals, University of Silesia, 40-007 Katowice, Bankowa 12, Poland

Transformation sequences in a NiTi shape memory alloy after deformation and subsequent annealing were studied using various methods. Low temperature annealing of the deformed alloy caused that the R-phase preceeded the martensitic transformation. The R-phase formation during both cooling and heating depends strongly on the deformation degree and temperature of annealing. On DTA curves an additional peak in the martensitic transformation range was observed for specimens annealed at 500 and 550°C. It is suggested that this peak was caused by presence of dislocation cell structure and subgrains whose boundaries interact with growing martensite plate.

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