Abstract
The structural relaxation and crystallization of Fe 85− x Co x B 15 amorphous ribbons was studied by thermomechanical analysis. The role of thermal history on reversibility of sample length change is evidenced. From flexure experiments performed at room temperature after pre-annelaing, we observe a substantial increase of Young's modulus by 8% for relaxation and 50% for crystallization associated with a small density increase (about 0.08% and 2% respectively). The effect of cobalt content is revealed on the mean thermal expansion coefficient measured between 90 °C and 140 °C on the one hand and on the total residual shrinkage measured at room temperature after complete crystallization on the other hand. In agreement with other measurements, we observe a specific role of x (at.%) = 21 cobalt concentration on thermal stability.
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