Abstract
The reversible behavior of annealing embrittlement of an amorphous Fe77B13Si10 alloy has been examined by measuring the ductile-brittle trasition temperature (DBTT) and the volume change of the specimen during annealing. By annealing the alloy at temperatures between 593 K and 653 K, the DBTT rapidly increases accompanied by a increase in the Curie temperature and a decrease in the volume of the specimen. This increase of DBTT is attributed to a combined effect of a development of the chemical short range order and a decrease in free volume. Upon a subsequent short time annealing at about 700 K, however, the DBTT rapidly drops. By cyclic annealing between the temperatures for the embrittlement and the restoration, the DBTT reversibly changes. The very rapid reactions for the embrittlement and the restoration suggest that the reversible change in DBTT is due to a reversible formation and dissociation of the chemical short range order.
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