Abstract
Temperatures of phase transformations of a number of Ni2MnGa-based alloys (four compositions), which are characterized by substitution of nickel for manganese at an unchanged gallium content (25 at %), have been determined. As the nickel concentration increases with respect to the stoichiometric composition (or the electron concentration e/a increases), the liquidus (T liq), solidus (T sol), and martensitic transformation (T mart) temperatures increase, whereas the magnetic transformation temperature (T C) decreases slightly.
Similar content being viewed by others
References
A. N. Vasil’ev, V. D. Buchel’nikov, T. Takagi, et al., “Shape Memory Ferromagnets,” Usp. Fiz. Nauk 173(6), 577–608 (2003) [Phys.-Usp. 46 (6), 559–588 (2003)].
R. W. Overholser, M. Wuttig, and D. A. Neumann, “Chemical Ordering in Ni-Mn-Ga Heusler Alloys,” Scr. Mater. 40(10), 1095–1102 (1999).
E. Cesari, V. A. Chernenko, V. V. Kokorin, et al., “Internal Friction Associated with the Structural Phase Transformations in Ni-Mn-Ga Alloys,” Acta Mater. 45(3), 999–1004 (1997).
V. A. Chernenko, J. Pons, C. Segui, et al., “Premartensitic Phenomena and Other Phase Transitions in Ni-Mn-Ga Alloys Studied by Dynamical Mechanical Analysis and Electron Diffraction,” Acta Mater. 50, 53–60 (2002).
V. V. Khovailo, V. D. Buchelnikov, R. Kainuma, et al., “Phase Transitions in Ni2 + x Mn1 − x Ga with a High Ni Excess,” Phys. Rev. B: Condens. Matter Mater. Phys. 72, 224408 (2005).
D. L. Schlagel, Y. L. Wu, W. Zhang, et al., “Chemical Segregation during Bulk Single Crystal Preparation of Ni-Mn-Ga Ferromagnetic Shape Memory Alloys,” J. Alloys Compd. 312, 77–85 (2000).
A. N. Vasil’ev, A. D. Bozhko, V. V. Khovailo, et al., “Structural and Magnetic Transitions in Shape-Memory Alloys Ni2 + x Mn1 − x Ga,” Phys. Rev. B: Condens. Matter Mater. Phys. 59, 1113–1120 (1999).
K. Ullakko, Y. Ezer, A. Sozinov, et al., “Magnetic-Field-Induced Strains in Polycrystalline Ni-Mn-Ga at Room Temperature,” Scr. Mater. 44, 475–480 (2001).
A. G. Popov, V. V. Belozerov, V. V. Sagaradze, et al., “Martensitic Transformations and Magnetic-Field-Induced Strains in Ni50Mn50 − x Gax Alloys,” Fiz. Met. Metalloved. 102(2), 152–161 (2006) [Phys. Met. Metallogr. 102 (2), 140–148 (2006)].
Ch. Jiang, G. Feng, Sh. Gong, et al., “Effect of Ni Excess on Phase Transformation Temperatures of NiMnGa Alloys,” Mater. Sci. Eng., A 342, 231–235 (2003).
V. A. Chernenko, “Compositional Instability of β-Phase in Ni-Mn-Ga Alloys,” Scr. Mater. 40(5), 523–527 (1999).
J. Pons, V. A. Chernenko, R. Santamarta, et al., “Crystal Structure of Martensitic Phases in Ni-Mn-Ga Memory Alloys,” Acta Mater. 48, 3027–3038 (2000).
V. D. Buchel’nikov, A. N. Vasil’ev, V. V. Koledov, et al., “Magnetic Shape-Memory Alloys: Phase Transitions and Functional Properties,” Usp. Fiz. Nauk 176(8), 900–906 (2006) [Phys.-Usp. 49 (8), 871–877 (2006)].
T. E. Strenger and J. Trivisonno, “Ultrasonic Study of the Two-Step Martensitic Phase Transformation inNi2MnGa,” Phys. Rev. B: Condens. Matter Mater. Phys. 57(5), 2735–2739 (1998).
Author information
Authors and Affiliations
Additional information
Original Russian Text © N.N. Stepanova, D.P. Rodionov, V.A. Kazantsev, V.A. Sazonova, Yu.N. Akshentsev, 2007, published in Fizika Metallov i Metallovedenie, 2007, Vol. 104, No. 6, pp. 618–623.
Rights and permissions
About this article
Cite this article
Stepanova, N.N., Rodionov, D.P., Kazantsev, V.A. et al. Changes in the temperatures of phase transformations of the Ni2MnGa alloy upon substitution of nickel for manganese. Phys. Metals Metallogr. 104, 595–600 (2007). https://doi.org/10.1134/S0031918X07120071
Received:
Accepted:
Issue Date:
DOI: https://doi.org/10.1134/S0031918X07120071