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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 about this in my monograph, published in November 2020:
"The concept of dual-energetic martensite (CODEM) for shape memory phenomena", PDF-file
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