Abstract
Transformation behaviour in Ti-(50-x)Pd-xFe shape memory alloys was investigated by electrical resistivity and specific heat measurements. The alloys with x = 14, 16 and 18 exhibit an obvious first order martensitic transformation but the alloys with x ≥ 19 do not exhibit a first order transformation down to 4.2 K. However, the alloys with x ≥ 19 show a negative temperature coefficient in electrical resistivity below a specific temperature Tmin. In addition, specific heat measurements at cryogenic temperatures revealed that the Debye temperature of the first order transformation-suppressed state is significantly lower than that of the martensite state. These anomalies are suggested to be caused by an instability of the electronic structure of the B2-phase.
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