Shape memory and magnetic properties of Co–Al ferromagnetic shape memory alloys
Shape memory and magnetic properties of Co–Al ferromagnetic shape memory alloys
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DOI：
10.1016/j.msea.2005.12.068
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发表时间：
2006-11
期刊：
影响因子：
6.4
通讯作者：
T. Omori;Y. Sutou;K. Oikawa;R. Kainuma;K. Ishida
中科院分区：
文献类型：
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作者：
T. Omori;Y. Sutou;K. Oikawa;R. Kainuma;K. Ishida
研究了 Co-14at.% 铝合金中从面心立方到六方密排结构的马氏体转变、形状记忆（SM）效应和磁性能，并使用透射电子显微镜检查了马氏体的微观结构。研究发现，SM 效应发生在相当于逆转变温度的 200 至 300°C 之间，并且在 600°C 时效的 Co-14at.% Al 中形成亚稳态 L12 结构相。通过振动样品磁力计测量磁性能，测得居里温度和饱和磁化强度在25℃时为689℃和120emu/g。所有这些结果表明Co-Al合金可以被列为一类新的铁磁SM合金。
Martensitic transformation from the face-centered cubic to the hexagonal close-packed structure, shape memory (SM) effect and magnetic properties in the Co–14at.% Al alloy were investigated and the microstructures of the martensite were examined using transmission electron microscopy. It was found that the SM effect occurs at temperatures between 200 and 300°C corresponding to the reverse transformation temperatures, and that a metastable L12-structured phase is formed in Co–14at.% Al aged at 600°C. The magnetic properties were measured by a vibrating sample magnetometer, and the Curie temperature and saturation magnetization were determined to be 689°C and 120emu/g at 25°C. All these results indicate that Co–Al alloys can be listed as a new class of ferromagnetic SM alloys.