Abstract
When cerium is subjected to the thermal cycling between room and liquid air temperatures, the amount of α phase increases after each cycle as the electrical resistance changes accordingly, where the changing manners of both factors are quite similar. However, although terminal temperatures of the thermal cycling are far different from the transformation temperature, the amount of phase change never attains 100%, but a certain equilibrium value. In this paper, the transformation mechanism of cerium was discussed theoretically, while an attempt was made to give a theoretical explanation upon the above mentioned attainment of an equilibrium, utilizing the theory of martensite formation in carbon steel by Cohen, et al, considering the size effect due to the subdivision of crystal grains by the formed martensite leaves. The experimental part of this study was previously reported by the author at Virginia Academy of Science meeting.
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