Compositional Dependence of Physical Properties and Reversible Structural Relaxation Behavior in Fe-B-Si Amorphous Alloys

Abstract

Reversible structural relaxation behavior in Fe-B-Si amorphous alloys was discussed on the basis of the structural model proposed by Dobois et al. According to the model, the structure consists of the two regions A_B and A_Fe which are occupied by Fe atoms with and without B neighbors, respectively, in Fe-B-Si amorphous alloys (B<20 at%). The silicon atoms exist only in the region A_Fe.
The validity of this model was confirmed for Fe_88−xB₁₂Si_x amorphous alloys (2≤x≤13) through the measurements of differential scanning calorie, Mössbauer effect and Vickers hardness.
The reversible behavior in Fe₇₈B₇Si₁₅ and Fe₇₅B₁₀Si₁₅ amorphous alloys was then investigated by means of electrical resistivity and differential scanning calorie measurements and compared with each other. As a result, reversible changes were obsenved in both alloys and their quantities differed obviously. The difference was explained well by the reversible structural relaxation in the region A_Fe.