CORRELATION BETWEEN THE CHANGES IN STRUCTURE AND ELECTRICAL RESISTIVITY OF AMORPHOUS METALS

概要

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Using electron microscopy and electrical resistivity measurements, structural changes in amorphous alloys, which occurred during heating, were studied over a wide temperature range. Ribbons of Fe-B-Si alloy were prepared by quenching liquid alloy on to cold twin rollers rotating at high speed ; several different rotation speeds were used. Amorphous ribbons of Ni_<80> (P_x B_<1-x>)_<20> alloys, where X=0.25, 0.5, 0.75, were made also using one roll speed. Among these ribbons, differences were found in electrical resistivity and its annealing behavior, which depended on the quenching conditions and on the ratio of the contents of two component metalloids. In the system Ni_<80> (P_x B_<1-x>)_<20>, it was found that the electrical resistivity of the Ni_<80> P_<10> B_<10> alloy specimen had the highest value. It was also found that the electrical resistivity was increased by the cyclic deformation of the liquid-quenched Co-B-Si amorphous alloy. Differences in thermal and mechanical stability of these alloys suggest that so-called amorphous alloys do not have one definite atomic arrangement but have a variety of arrangements, depending on the conditions of preparation.
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