Development of the Co-Ni-AI ferromagnetic shape memory alloys
Development of the Co-Ni-AI ferromagnetic shape memory alloys
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Co-Ni-AI铁磁形状记忆合金的研制
DOI：
10.1051/jp4:20031054
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发表时间：
2003
期刊：
影响因子：
--
通讯作者：
K. Ishidal
中科院分区：
文献类型：
--
作者：
K. Oikawa;T. Omori;Y. Sutou;R. Kainumal;K. Ishidal
已开发出具有β+γ两相结构的Co-Ni-Al三元系远磁形状记忆合金。 Co-33Ni-27Al和Co-34Ni-28Al合金的β(B2)相表现出顺磁/铁磁转变以及从β到β'(L1 0 )的热弹性马氏体转变。两种合金的显微组织均显示出初生p相被y（Al）相包围，这对热加工性能的改善产生了巨大的影响。通过固溶处理后的两相区退火，除了β晶粒内以外，y相还沿着β相的晶界析出。 1273 K 退火的合金表现出良好的冷加工性和热激活形状记忆效应。这些铁磁和延展性形状记忆合金是非常有前途的新型智能材料之一。
Farromagnetic shape memory alloys have been developed in the Co-Ni-Al ternary system with β + γ two-phase structure. The β(B2) phase of the Co-33Ni-27Al and Co-34Ni-28Al alloys exhibits both paramagnetic/ferromagnetic transition and a thermoelastic martensitic transformation from β to β' (L1 0 ). The microstructure of both alloys shows the primary p phase surrounded by the y (Al) phase which brings about the drastic effect in the improvement of the hot workability. By annealing in the two-phase region after solution treatment, the y phase precipitates along grain boundaries in the β phase, besides in the β grain. The alloys annealed at 1273 K showed a good cold workability and a thermal activated shape memory effect. These ferromagnetic and ductile shape memory alloys are very promising for one of the new smart materials.