Atomic Processes of the Solid-Liquid Phase Transition in Metals with Close Packed Structrues

DOI Web Site 被引用文献2件 参考文献6件
  • Takeuchi Sakae
    Emeritus Professor of Tohoku University, The Research Institute for Iron, Steel and Other Metals, Tohoku University
  • Hayasaka Hideo
    Radiation Engineering Laboratory, Faculty of Engineering, Tohoku University

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Atomic processes associated with the solid-liquid phase transition in close packed metals are discussed.There exists a definite temperature T* at which the resonance in vibration takes place between atoms adjacent to vacancies and atoms apart from them. A number of Frenkal defects originates in a crystalline domain around a vacancy through the chain-reaction like spreading of the resonance at T*, and the domain results in the random arrangement. It becomes more probable to generate vacancies in the surface of crystal at T*. The surface layer and the crystalline domain near the surface change into the disorderly arrangement of atoms due to some of surface vacancies, and others diffuse into the disordered domains and the remaining crystalline domains. Vacancies can travel easily in the disordered domain, and this means that there exist atoms in the translational motion, their concentration being identical with vacancies. Liquid is the state in which the vibrational motion coexists with the translational one. The temperature T* is the melting point of metals which is given by (9⁄8)(kTm⁄L0)=0.0344. The latent heat of fusion and the entropy change on melting are evaluated in good agreement with the observation according to the above atomic processes.

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