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The Ni47Mn32Ga21 polycrystalline alloy is prepared by the directional solidification technique. The components and the microstructure of the alloy are investigated using SEM, metallography and EDS methods. The magnetic entropy change in the process of the structural and magnetic phase transition, and magnetic-field-induced strains with pressure are also studied through analyzing the magnetization as a function of temperature, and the isotherm magnetization and magnetic field-induced strain curves. The results show that there is little difference between the component and the designed component. The alloy is comprised mainly of martensitic phase at room temperature. In the heating process, the magnetic entropy change reaches a maximum value and has a larger peak half width near Curie temperature(365 K). The maximum value of the magnetic entropy change is -1.45 J/kg K in a magnetic field of 747 kA/m and its peak half width is 21 K. The Ni47Mn32Ga21 alloy exhibits excellent free recoverability of the magnetic-field-induced strains at room temperature(298 K). The magnetic-field-induced strain reaches a saturated value of -67010-6 without extra stress in a field of 480 kA/m. When the compressive stressis parallel to the direction of the magnetic field, the magnetic-field-induced strain increases evidently with the increase of the pressure, which reaches -130010-6 under a pressure of 27.3 MPa. Meanwhile the strain does not reach the saturated value.
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Keywords:
- Ni-Mn-Ga /
- ferromagnetic shape memory alloy /
- magnetic entropy change /
- magnetic-field-induced strain
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[34] Karaca H E, Karaman I, Basaran B, Lagoudas D C, Chumlyakov Y I, Maier H J 2007 Acta Mate. 55 4253
[35] [36] [37] Karaman I, Karaca H E, Basaran B, Lagoudas D C, Chumlyakovc Y I, Maierd H J 2006 Scripta Mater. 55 403
[38] [39] Marcos J, Planes A, Maosa L, Casanova F, Batlle X, Labarta A, Martnez B 2002 Phys. Rev. B 66 224413
[40] Hu F X, Sun J R, Wu G H, Shen B G 2001 J. Appl. Phys. 90 5216
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[44] [45] Ma L, Zhu Z Y, Li M, Yu S D, Cui Q L, Zhou Q, Chen J L, Wu G H 2009 Aact 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 3479]
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[1] Hu F X, Shen B G, Sun J R 2000 Appl. Phys. Lett. 76 3460
[2] [3] Thang J Y, Luo J, Liang J K, Ji L N, Liu Y H, Li J B, Rao G H 2008 Aact Phys. Sin. 57 6482 (in Chinese) [张继业、 骆 军、 梁敬魁、 纪丽娜、 刘延辉、 李静波、 饶光辉 2008 57 6482]
[4] [5] Pasquale M, Sasso C P, Lewis L H, Giudici L, Lograsso T, Schlage D 2005 Phys. Rev. B 72 094435
[6] Cui Y T, You S Q, Wu L, Ma Y, Kong C Y, Yang X H, Pan F S 2010 Rare Metal Materials and Engineering 39 0189
[7] [8] [9] Mandal K, Pal D, Scheerbaum N, Lyubina J, Gutfleisch O 2009 J. Appl. Phys. 105 073509
[10] [11] Tegus O, Brck E, Zhang L, Dagula, Buschow K H J, Boer F R 2002 Physica B: Condensed Matter 319 174
[12] Duan J F, Huang P, Zhang H, Long Y, Wu G H, Ye R C, Chang Y Q, Wan F R 2007 J. Alloys Comp. 441 29
[13] [14] [15] Sderberg O, Ge Y, Sozinov A, Hannula S P, Lindroos V K 2005 Smart. Mater. Struct. 14 S223
[16] Guo S H, Zhang Y H, Zhao Z Q, Li J L,Wang X L 2004 Aact Phys. Sin. 53 1599 (in Chinese) [郭世海、 张羊换、 赵增祺、 李健靓、 王新林 2004 53 1599]
[17] [18] Malla A, Dapino M J, Lograsso T A, Schlagel D L 2006 J. Appl. Phys. 99 063903
[19] [20] Aliev A, Batdalov A, Bosko S, Buchelnikov V, Dikshtein I, Khovailo V, Koledov V, Levitin R, Shavrov V, Takagi T 2004 J. Magn. Magn. Mater. 272-276 2040
[21] [22] Ingale B, Gopalan R, Chandrasekaran V, Ram S 2009 J. Appl. Phys. 105 023903
[23] [24] Hu F X, Shen B G, Sun J R, Wu G H 2001 Phys. Rev. B 64 132412
[25] [26] Cherechukin A A, Takagi T, Matsumoto M, Buchel'nikov V D 2004 Phys. Lett. A 326 146
[27] [28] Long Y, Zhang Z Y, Wen D, Wu G H, Ye R C, Chang Y Q, Wan F R 2005 J. Appl. Phys. 98 046102
[29] [30] [31] Liu X B, Shen B G 2005 Aact Phys. Sin. 54 5884 (in Chinese) [刘喜斌、 沈保根 2005 54 5884]
[32] [33] Tang Y J, Solomon V C, Smith D J, Harper H, Berkowitz A E 2005 J. Appl. Phys. 97 10M309
[34] Karaca H E, Karaman I, Basaran B, Lagoudas D C, Chumlyakov Y I, Maier H J 2007 Acta Mate. 55 4253
[35] [36] [37] Karaman I, Karaca H E, Basaran B, Lagoudas D C, Chumlyakovc Y I, Maierd H J 2006 Scripta Mater. 55 403
[38] [39] Marcos J, Planes A, Maosa L, Casanova F, Batlle X, Labarta A, Martnez B 2002 Phys. Rev. B 66 224413
[40] Hu F X, Sun J R, Wu G H, Shen B G 2001 J. Appl. Phys. 90 5216
[41] [42] [43] Murray S J, Farinelli M, Kantner C, Huang J K, Allen S M, OHandley R C 1998 J. Appl. Phys. 83 7297
[44] [45] Ma L, Zhu Z Y, Li M, Yu S D, Cui Q L, Zhou Q, Chen J L, Wu G H 2009 Aact 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 3479]
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