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The structures, the martensitic transformations and the magnetic properties of ferromagnetic shape memory alloy Mn2NiGa with the loading and the unloading of the external compressive stress are investigated. The plastic deformation occurring during the stressing causes a high level of dislocation defects existing in the sample. The residual internal stress results in a significant increase of the reversed transformation temperature. The threshold value of compressive pressure for causing the completely martensitic transformation at room temperature is identified to be 1.0 GPa based on the experimental measurements of XRD and magnetic coercivity. The coercivity of the martensitic phase increases from 50 Oe to 350 Oe due to the application of the external stress up to 2.0 GPa. It is also observed that the reversed martensitic transformation occurrs, when the sample is treated by heating up to about 730 K. This is attributed to the elimination of the dislocation by the annealing effect. Such a high reverse martensitic transformation temperature allows the measurement of the Curie temperature of martensitic phase and the obtained value is 530 K.
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Keywords:
- ferromagnetic shape memory alloys /
- Mn2NiGa /
- residual internal stress /
- martensitic transformation
[1] Ullakko K, Huang J K, Kantner C, Ohandley R C, Kokorin V V 1996 Appl. Phys. Lett. 69 1966
[2] Murray S J, Marioni M, Allen S M, O’Handley R C, Lograsso T A 2000 Appl. Phys. Lett. 77 886
[3] O’Handley R C, Murray S J, Marioni M, Nembach H, Allen S M 2000 J. Appl. Phys. 87 4712
[4] Meng F B, Guo H J, Liu G D, Liu H Y, Dai X F, Luo H Z, Li Y X, Chen J L, Wu G H 2009 Chin. Phys. B 18 3031
[5] Xu G L, Chen J D, Chen D, Ma J Z, Yu B H, Shi D H 2009 Chin. Phys. B 18 744
[6] Murray S J, Farinelli M, Kantner C, Huang J K, Allen S M, O’Handley R C 1998 J. Appl. Phys. 83 7297
[7] Chernenko V A, L’Vov V, Pons J, Cesari E 2003 J. Appl. Phys. 93 2394
[8] Mullner P, Chernenko V A, Kostorz G 2003 Scripta Mater. 49 129
[9] Sutou Y, Kamiya N, Omori T, Kainuma R, Ishida K, Oikawa K 2004 Appl. Phys. Lett. 84 1275
[10] Manosa L, Moya X, Planes A, Gutfleisch O, Lyubina J, Barrio M, Tamarit J L, Aksoy S, Krenke T, Acet M 2008 Appl. Phys. Lett. 92 012515
[11] Ma L, Zhu Z Y, Yu S D, Cui Q L, Zhou Q, Chen J L, Wu G H 2009 Acta Phys. Sin. 58 3479(in Chinese) [马丽,朱志永,李敏,于世丹,崔启良,周强,陈京兰,吴光恒 2009 58 3497]
[12] Liu G D, Chen J L, Liu Z H, Dai X F, Wu G H, Zhang B, Zhang X X 2005 Appl. Phys. Lett. 87 262504
[13] Song R N, Li X, Zhu W, Liu E K, Li G J, Cai J F, Wang W H, Wu G H 2011 Acta Phys. Sin. 60 077501 (in Chinese) [宋瑞宁,李祥,朱伟,刘恩克,李贵江,蔡金芳,王文洪,吴光恒 2011 60 077501]
[14] Cui Z Q, Tan Y C 2007 Metallography & Heat Treatment (Beijing: Engineering Industry Publishing House) p194 (in Chinese) [崔忠圻,谭耀春 2006 金属学与热处理 (北京:机械工业出版社) 第194页]
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[1] Ullakko K, Huang J K, Kantner C, Ohandley R C, Kokorin V V 1996 Appl. Phys. Lett. 69 1966
[2] Murray S J, Marioni M, Allen S M, O’Handley R C, Lograsso T A 2000 Appl. Phys. Lett. 77 886
[3] O’Handley R C, Murray S J, Marioni M, Nembach H, Allen S M 2000 J. Appl. Phys. 87 4712
[4] Meng F B, Guo H J, Liu G D, Liu H Y, Dai X F, Luo H Z, Li Y X, Chen J L, Wu G H 2009 Chin. Phys. B 18 3031
[5] Xu G L, Chen J D, Chen D, Ma J Z, Yu B H, Shi D H 2009 Chin. Phys. B 18 744
[6] Murray S J, Farinelli M, Kantner C, Huang J K, Allen S M, O’Handley R C 1998 J. Appl. Phys. 83 7297
[7] Chernenko V A, L’Vov V, Pons J, Cesari E 2003 J. Appl. Phys. 93 2394
[8] Mullner P, Chernenko V A, Kostorz G 2003 Scripta Mater. 49 129
[9] Sutou Y, Kamiya N, Omori T, Kainuma R, Ishida K, Oikawa K 2004 Appl. Phys. Lett. 84 1275
[10] Manosa L, Moya X, Planes A, Gutfleisch O, Lyubina J, Barrio M, Tamarit J L, Aksoy S, Krenke T, Acet M 2008 Appl. Phys. Lett. 92 012515
[11] Ma L, Zhu Z Y, Yu S D, Cui Q L, Zhou Q, Chen J L, Wu G H 2009 Acta Phys. Sin. 58 3479(in Chinese) [马丽,朱志永,李敏,于世丹,崔启良,周强,陈京兰,吴光恒 2009 58 3497]
[12] Liu G D, Chen J L, Liu Z H, Dai X F, Wu G H, Zhang B, Zhang X X 2005 Appl. Phys. Lett. 87 262504
[13] Song R N, Li X, Zhu W, Liu E K, Li G J, Cai J F, Wang W H, Wu G H 2011 Acta Phys. Sin. 60 077501 (in Chinese) [宋瑞宁,李祥,朱伟,刘恩克,李贵江,蔡金芳,王文洪,吴光恒 2011 60 077501]
[14] Cui Z Q, Tan Y C 2007 Metallography & Heat Treatment (Beijing: Engineering Industry Publishing House) p194 (in Chinese) [崔忠圻,谭耀春 2006 金属学与热处理 (北京:机械工业出版社) 第194页]
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