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通过施加压应力的方法,在铁磁形状记忆合金Mn2NiGa中引入残留内应力,研究了内应力对Mn2NiGa材料的结构、相变和磁性能的影响.研究发现,加压过程使材料发生了塑性形变,在材料内部引入了大量的位错缺陷.卸载后保留的位错缺陷在材料中造成了残留的内应力,导致了马氏体相变温度大幅度提高, 使原本室温下的母相转变成了马氏体相.测量到导致样品转变成马氏体的阈值压应力为1.0 GPa.加压形成的马氏体中的残留内应力将矫顽力从低于50 Oe提高到350 Oe.残留内应力在730 K的热处理中由于位错缺陷的消失而得以消除,样品实现了马氏体逆相变.如此高的逆相变温度使得 Mn2NiGa马氏体的居里温度测量成为可能,获得了530K的数值.
[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 物理学报 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 物理学报 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 物理学报 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 物理学报 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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