| 高锰含量Mn50＋xNi41-xSn9合金的相变和磁热效应 |
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| 引用本文： | 韩志达,郑志华.高锰含量Mn50＋xNi41-xSn9合金的相变和磁热效应[J].常熟理工学院学报,2012,26(2):36-40. |
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| 作者姓名： | 韩志达 郑志华 |
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| 作者单位： | 1. 常熟理工学院物理与电子工程学院,江苏常熟215500／江苏省新型功能材料重点建设实验室,江苏常熟215500
2. 江苏省新型功能材料重点建设实验室,江苏常熟,215500 |
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| 基金项目： | 国家自然科学基金青年基金项目“Ni-Mn基铁磁形状记忆合金的磁热效应研究” |
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| 摘 要： | 采用电弧熔炼方法制备了Mn50＋xNi41-xSn9系列铁磁形状记忆合金，并对其磁性、相变和磁热效应进行了研究。结果表明，合金在室温下均表现为四方马氏体相和立方奥氏体相的混合相，随着Mn含量的增加，由于价电子浓度的减少，马氏体转变温度逐渐下降，当x=2—4时，马氏体相变伴随着较大磁化强度的突变，同时合金表现出较大的逆磁热效应，这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 马氏体相变 磁熵变 |
The Phase Transitions and Magnetocaloric Effect in Mn-rich Mn50＋xNi41-xSn9 Alloys |
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| HAN Zhi-daa,b, ZHENG Zhi-hua.The Phase Transitions and Magnetocaloric Effect in Mn-rich Mn50＋xNi41-xSn9 Alloys[J].Journal of Changshu Institute of Technology,2012,26(2):36-40. |
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| Authors: | HAN Zhi-daa b ZHENG Zhi-hua |
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| Institution: | a(a. School of Physics and Electronic Engineering; b. Jiangsu Laboratory of Advanced Functional Materials, Changshu Institute of Technology, Changshu 215500, China) |
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| Abstract: | Mn50+xNi41-xSn9 ferromagnetic shape memory alloys were prepared by arc melting, and their magnetic properties, phase transitions, and magnetocaloric effect were investigated. All the alloys show the coexistence of tetragonal L10 structure and cubic Hg2CuTi structure. The martensitic transformation temperatures decrease with the increase of Mn content, which can be attributed to the increase of valence electron concentration. In the composition range of2≤x≤4], great changes in both magnetization and magnetic entropy across martensitic transformation are observed. These results suggest the great potential of Mn50+xNi41-xSn9 alloys as magnetic refrigerant. |
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| Keywords: | ferromagnetic shape memory alloy martensitic transformation magnetic entropy change |
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