발간논문

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Vol.31, No.7, 880 ~ 888, 1993
Title
A Study on Phase Transformation in Aged Fe - 40wt%Cr Alloy by Mossbauer Spectroscopy and magnetization Measurements
박광석Gwang Seok Park, 윤용구Young Ku Yoon
Abstract
Phase transformation in Fe-40wt.%Cr binary alloy thermally aged at 475℃ was investigated by Mo¨ssbauer spectroscopy, superconductivity quantum interference device(SQUID) and vibrating sample magnetometer(VSM). Microhardness change accompanying its thermal aging was also studied. Microhardness of the binary alloy increased immediately and without saturation with aging up to 2000 hours. Specific saturation magnetization value(σ_s) measured at room temperature by VSM increased during the initial aging time of 2 hours to 1000 hours whereas it increased slowly during aging of 1000 to 2000 hours. Broadening of the six-line Mo¨ssbauer spectrum obtained at room temperature and additional appearance of paramagnetic peaks were observed for binary alloy specimens aged for a time range of 400 to 2000 hours. These observations indicate occurrence of phase separation into Fe-rich and Cr-rich region. Results of Curie temperature measurements for the Cr-rich region by SQUID indicate that the volume fraction and Cr concentration of the Cr-rich region increased with increasing aging time. These results lead to a conclusion that spinodal decomposition progresses during aging at 475℃ and the Fe-40wt.%Cr alloy and that gives rise to hardening of the alloy.
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