Anomalous Volume Magnetostriction of Invar Alloys

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  • Tino Yosiaki
    Department of Physics, Faculty of Science, Science University of Tokyo
  • Maeda Takao
    Department of Physics, Faculty of Science, Science University of Tokyo

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Abstract

The anomalous volume magnetostriction characteristic of Invar alloys was investigated as a link in the Invar-problem. The variation of volume magnetostriction with temperature was measured on the specimens subjected not only to annealing but also to cold-work; especially the behaviours just below and beyond the ferromagnetic Curie temperature were observed. The measurements of Mössbauer effect for the alloys were also carried out as a function of temperature, and the influence of external magnetic field on the Mössbauer spectra was examined. It was confirmed that an Invar-type alloy contains a considerable amount of the magnetization caused by the application of the field or an assembly of states of predominance of the para-process, the origin of which may be ascribed to the internal disturbances caused around the α-phase embryos embeded in the γ-matrix, due to the transitionary process towards an equilibrium of the two-phase transformation.

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