Minoru Takahashi1, Takashi Ishii2 and Shunji Ishio1
1Department of Applied Physics, Faculty of Engineering, Tohoku University, Sendai
Annealing effects on the thermal expansion properties of amorphous Fe-B alloys have been investigated to clarify the structural relaxation in the amorphous state and the crystallization process. In an amorphous Fe88B12 alloy, the length contraction due to exhaustion of free volume was found to start from about 400 K and becomes 0.80×10-3 at 500 K, and the activation energy for this process was evaluated as about 30 kJ/mol. On the other hand, an appreciable change in the thermal expansion by annealing was not found in Fe83B17 and Fe75B25 alloys. These results are discussed in connection with the change in the atomic short range order with B concentration.
structural relaxation, crystallization, thermal expansion, amorphous iron-boron, free volume, atomic short range order
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