Martensitic Transformation in NiCoMnSn Metamagnetic Shape Memory Alloy Powders
Martensitic Transformation in NiCoMnSn Metamagnetic Shape Memory Alloy Powders
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DOI：
10.2320/matertrans.mrp2008126
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发表时间：
2008-08
影响因子：
1.2
通讯作者：
Kouhei Ito;W. Ito;R. Umetsu;M. Nagasako;R. Kainuma;A. Fujita;K. Oikawa;K. Ishida
中科院分区：
文献类型：
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作者：
Kouhei Ito;W. Ito;R. Umetsu;M. Nagasako;R. Kainuma;A. Fujita;K. Oikawa;K. Ishida
研究了用气体雾化法制备的NiCoMnSn变磁形状记忆合金粉末的马氏体和磁性能。雾化态粉末为树枝状结构，经1173 K退火2 h后，其结构转变为单相结构。虽然马氏体相变行为与大块样品几乎相同，但退火态粉末的相变热间隔，即Ms-Mf，随着退火时间的增加而减小。在1173 K退火144 h后，通过施加7 T的磁场，证实了粉末发生了可逆的变磁相变。
Martensitic and magnetic properties of NiCoMnSn metamagnetic shape memory alloy powders obtained by a gas atomization method were investigated. The as-atomized powders showed a dendritic structure which changed to a single-phase one by annealing at 1173 K for 2 h. Although the martensitic transformation behavior was almost the same as that in bulk samples, the transformation thermal interval, namely, M s - M f , of the as-annealed powders decreased with increasing annealing time. In the powders annealed at 1173 K for 144 h, a reversible metamagnetic phase transition was confirmed by the application of a magnetic field of 7 T.