| Ni-Mn-Co-Sn铁磁形状记忆合金的磁性、相变及磁热效应 |
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| 引用本文： | 韩志达.Ni-Mn-Co-Sn铁磁形状记忆合金的磁性、相变及磁热效应[J].常熟理工学院学报,2009,23(10):19-22. |
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| 作者姓名： | 韩志达 |
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| 作者单位： | 常熟理工学院,物理与电子工程学院,江苏,常熟,215500;南京大学物理系,江苏,南京,210093 |
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| 摘 要： | 采用电弧熔炼的方法制备了Ni43Mn46-xCoxSn1，系列铁磁形状记忆合金，并对其磁性和相变进行了研究．结果表明，由于价电子浓度的增加，Co替代Mn使材料马氏体转变温度迅速提高．Co的加入使合金的奥氏体居里温度迅速提高，而马氏体居里温度则略有降低．在马氏体相变附近，由于磁化强度的突变，合金表现出巨大的逆磁热效应，表明该系列合金在磁制冷领域有着潜在的应用价值．
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| 关 键 词： | 铁磁形状记忆合金 磁熵变 磁制冷 |
The Magnetic Properties,Phase Transitions,and Magnetocaloric Effect in Ni-Mn-Co-Sn Ferromagnetic Shape Memory Alloys |
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| HAN Zhi-da.The Magnetic Properties,Phase Transitions,and Magnetocaloric Effect in Ni-Mn-Co-Sn Ferromagnetic Shape Memory Alloys[J].Journal of Changshu Institute of Technology,2009,23(10):19-22. |
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| Authors: | HAN Zhi-da |
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| Institution: | HAN Zhi-da (1.School of Physics and Electronics Engineering, Changshu Institute of Technology, Changshu 215500, China; 2.Department of Physics, Nanjing University, Nanjing 210093, China) |
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| Abstract: | Ni43Mn46-xCoxSn11 ferromagnetic Shape Memory Alloys were prepared by arc melting, and its magnetic properties and phase transitions were investigated. The martensitic transformation temperatures increase rapidly with the substitution of Mn by Co, which can be attributed to the increase of valence electron concentration. With the increase of Co concentration, the Curie temperature of austenitic phase increases rapidly, while the Cu- rie temperature of martensitic phase decreases slightly. Large inverse magnetocaloric effect is observed due to the large magnetization change around the martensitic transformation temperature. This suggests great potential of Ni43Mn46-xCoxSn11 alloys as magnetic refrigerant. |
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| Keywords: | ferromagnetic shape memory alloy magnetic entropy change magnetic refrigeration |
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