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Thermodynamic Parameter of the Martensitic Transformation
of NiTi-X-Shape Memory Alloys


V.Prieb
"MFS-Büro Dr. Prieb", Berlin, DE

"Materials Sciences Transactions", 6(2000)12, p.p. 12-15


Abstract: Polycrystalls of NiTi-based shape memory alloys with a third component X (X = Au, Pt, Pd or Al) were examined with calorimetric measurements to investigate the thermodynamic parameters and characteristics of the hysteresis of the thermoinduced martensitic transformation.

All known sequences of transformations of NiTi-based shape memory alloys were observed. The enthalpy and entropy of the martensitic transformations B2-R, R-B19' and B2-B19 were measured and calculated. The smallest dissipative characteristics are found for the transformations B2-B19 with invariant plane. The SMART effect in partial thermocycles was investigated and discussed.

More:
"Calorimetry of shape memory alloys"
- collected articles (pdf-file)