Fe-B-SiおよびFe-P-Si系非晶質合金の焼鈍脆化におよぼす合金組成の影響

抄録

In order to obtain informations about the compositional dependence of temper embrittlement of Fe-B-Si and Fe-P-Si amorphous alloys, simple bend properties, X-ray diffraction and DSC spectra of as-quenched and annealed specimens were examined. In both of the above systems, a high embrittlement susceptibility has been observed, when the composition is located in a hypereutectic region. While, when the composition is located near a eutectic or in a hypoeutectic region, the embrittlement susceptibility drastically decreases, e.g., an Fe_79.5B₁₂Si_8.5 amorphous alloy having a near eutectic composition remains ductile until crystallization. On the other hand, the embrittlement does not correlate with the degree of phase separation estimated from X-ray diffraction and the amount of heat released during structural relaxation.