Cu含量对Ni_(55)Fe_(18)Ga_(27)合金结构和磁性的影响
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摘要
系统研究了Cu分别替代Fe和Ni对Ni_(55)Fe_(18)Ga_(27)结构和磁性的影响.结果表明:熔炼Ni_(55)Fe_(18-x)Cu_xGa_(27 )(x=1, 2, 3, 4)虽仍为奥氏体相结构,但伴有γ相出现;居里温度随Cu含量增加而降低,这是由于Cu掺杂引起过渡金属近邻原子间相互交换作用减弱所致;交流磁化率随Cu含量增加而降低,原因在于Fe是磁性的主要贡献者,Cu替代Fe会削弱Fe的磁矩,从而导致合金磁性降低.熔炼、退火和甩带Ni_(51)Cu_4Fe_(18)Ga_(27)均存在马氏体相变.熔炼样品马氏体相变温度最高,退火和甩带样品基本相同.这一特点表明热处理方式能够改变原子排列的有序度,因此可以通过改变热处理方式来调控马氏体相变温度.
The structure and magnetism of Cu-doped in Ni_(55)Fe_(18)Ga_(27) alloy have been systematically studied in this paper. Arc-melting Ni_(55)Fe_(18-x)Cu_xGa_(27 )(x=1, 2, 3, 4) alloys keep austenitic structure with γ phase appearing. Curie temperature decreases with increasing Cu content due to that Cu-doping reduces the exchange interaction among neighboring atoms in the transition metals. Substitution of Fe by Cu weakens the magnetic moment of Fe, which plays a primary contribution to the magnetism of Ni-Fe-Ga alloy, thus AC susceptibility decreases with increasing Cu content. Ni_(51)Cu_4Fe_(18)Ga_(27) alloys prepared by arc-melting, annealing and melt-spinning(ribbon) techniques appear the martensitic transformation. The martensitic transformation temperature of arc-melting sample is higher than those of identical annealing and melt-spinning samples. This demonstrates that heat treatment method can change the order of atomic arrangement. Therefore, the martensitic transformation temperature can be dominated by changing heat treatment method.
The structure and magnetism of Cu-doped in Ni_(55)Fe_(18)Ga_(27) alloy have been systematically studied in this paper. Arc-melting Ni_(55)Fe_(18-x)Cu_xGa_(27 )(x=1, 2, 3, 4) alloys keep austenitic structure with γ phase appearing. Curie temperature decreases with increasing Cu content due to that Cu-doping reduces the exchange interaction among neighboring atoms in the transition metals. Substitution of Fe by Cu weakens the magnetic moment of Fe, which plays a primary contribution to the magnetism of Ni-Fe-Ga alloy, thus AC susceptibility decreases with increasing Cu content. Ni_(51)Cu_4Fe_(18)Ga_(27) alloys prepared by arc-melting, annealing and melt-spinning(ribbon) techniques appear the martensitic transformation. The martensitic transformation temperature of arc-melting sample is higher than those of identical annealing and melt-spinning samples. This demonstrates that heat treatment method can change the order of atomic arrangement. Therefore, the martensitic transformation temperature can be dominated by changing heat treatment method.
引文
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[4] Zheng H X, Xia M X, Liu J, et al. Martensitic transformation of Ni-Fe-Ga-(Co, Ag) magnetic shape memory alloys [J]. J. Alloy. Compd., 2005, 387: 265.
[5] Morito H, Oikawa K, Fujita A, et al. Control of phase transformation temperatures by substituents in Ni-Fe-Ga ferromagnetic shape memory alloys [J]. Mater. Trans., 2007, 48: 2847.
[6] Sofronie M, Tolea F, Kuncser V,et al. Martensitic transformation and accompanying magnetic changes in Ni-Fe-Ga-Co [J]. J. Appl. Phys., 2010, 107: 113905.
[7] Sarkar S K, Biswas A, Babu P D, et al. Effect of partial substitution of Fe by Mn in Ni55Fe19Ga26 on its microstructure and magnetic properties [J]. J. Alloy. Compd., 2014, 586: 515.
[8] El-Bagoury N, Hessien M M, Kaseem M A W. Martensitic transformation and magnetic properties of aged Ni-Fe-Ga-Ti shape memory alloy [J]. Int. J. Miner. Metall. Mater., 2013, 20: 867.
[9] Liu H Y. Influences of Mn/Cr doping on the phase transition and magnetic properties of Ni-Fe-Ga alloy [J]. J. At. Mol. Phys., 2017, 34: 948 (in Chinese). [刘红艳. Mn/Cr掺杂对Ni-Fe-Ga合金相变和磁性转变的影响[J]. 原子与分子物理学报, 2017, 34: 948]