Effect of Pressure on the Crystallization of Amorphous Fe–B Alloys

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Abstract
An experiment was carried out at high pressure on the crystallization of Fe–B amorphous alloys. Electrical resistance measurements showed that the temperature of the onset of crystallization, T x , for Fe86B14 and Fe75B25 alloys, increased monotonically with increasing pressure up to 100 kbar, suggesting that the diffusion of atoms for crystallization was suppressed by the pressure. With Fe86B14, a drastic decrease in T x was observed at about 100 kbar. In-situ X-ray diffraction at 113 kbar showed that γ-Fe crystal was precipitated instead of α-Fe. The reduction in the volume of the alloy associated with the precipitation of γ-Fe, which has a specific volume smaller than that of α-Fe, seems to be responsible for this drop in T x . This anomaly was not observed with Fe75B25, and Fe3B only was precipitated.