<報文>TiNi化合物の変態熱

概要

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The specific heat of TiNi compounds (Ti_<50>Ni_<50>, Ti_<49.7>Ni_<50.3>, Ti_<49>Ni_<51>, and Ti_<48.7>Ni_<51.3>) was measured under the various methods of heat treatment. (1) Two anomalous peaks were observed in the specific heat vs. temperature curves of TiNi compounds. These peaks correspound to the respective two transformations. (2) These two temperature of transformations were observed as clear separation : for Ti_<50>Ni_<50> due to the thermal cycle ; for Ti_<49>Ni_<51> due to the heat treatment at 400℃ for one hour. (3) Of the Ti_<50>Ni_<50> subjectcd to the thermal cycle, the heat of transformation from martensite phase to premartensite state and from premartensite state to parent phase were 282 cal/mol and 67 cal/mol, respectively. (4) The total heat of transformation decreased with the increases in Ni concentration. (5) The temperature of the anomalous specific heat which correspounds to the transformation from martensite phase to premartensite state decreased with the heat treatment of the thermal cycle.
東北大学の論文
1974-03-28