The Effect of Heat Treatment on the Shape Memory Effect and Superelasticity in NiMnGa Single Crystals

Abstract:

It was shown in Ni₅₃Mn₂₅Ga₂₂ single crystals that the annealing at 1273 K for 1 h followed by slow cooling, at which the (L2₁+γ)-structure is formed, provides the increase of crystals plasticity as compared with the brittle initial L2₁-single crystals. The increase of critical stresses by more than 2 times (up to σ > 150 MPa), at which the cooling/heating cycles under stress are accompanied by sample destruction, is observed. Moreover, the value of thermal hysteresis is increased by 1.5 times and the perfect curve of superelasticity is observed at T=423 K.

• Periodical: Key Engineering Materials (Volume 743)
• Pages: 91-94
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.743.91
• Online since: July 2017
• Authors: Maria Pichkaleva*, Ekaterina Timofeeva, Anton Tagiltsev, Elena Panchenko, Yuriy Chumlyakov
• Keywords: Hysteresis, Martensitic Transformation, Shape Memory Effect, Single Crystal, Strain, Stress, Superelasticity

References

[1] H. Xu, J. Wang, C. Jiang, Y. Li, Ni–Mn–Ga shape memory alloys development in China / Current Opinion in Solid State and Materials Science. 9 (2005) 319–325.

DOI: 10.1016/j.cossms.2006.02.010

[2] H.E. Karaca, I. Karaman, B. Basaran, D.C. Lagoudas, Y.I. Chumlyakov, H.J. Maier, On the stress-assisted magnetic-field-induced phase transformation in Ni2MnGa ferromagnetic shape memory alloys / Acta Materialia. 55 (2007) 4253–4269.

DOI: 10.1016/j.actamat.2007.03.025

[3] J. Wang, Ch. Jiang, Single-crystal growth of NiMnGa magnetic shape memory alloys, Journal of Crystal Growth. 310 (2008) 865-869.

DOI: 10.1016/j.jcrysgro.2007.11.197

[4] J. Mohd Jani, M. Leary, A. Subic, M. A. Gibson, A review of shape memory alloy research, applications and opportunities, Materials and Design. 56 (2014) 1078–1113.

DOI: 10.1016/j.matdes.2013.11.084

[5] Y. Xin,Y. Li, Z. Liu, Thermal stability of dual-phase Ni58Mn25Ga17 high-temperature shape memory alloy / Scripta Materialia. 63 (2010) 35–38.

DOI: 10.1016/j.scriptamat.2010.02.044

[6] R. Santamarta, E. Cesari, J. Muntasell, J. Font, J. Pons, P. Ochin, Thermal and microstructural evolution under ageing of several high-temperature Ni–Mn–Ga alloys, Intermetallics. 18 (2010) 977–983.

DOI: 10.1016/j.intermet.2010.01.016

[7] X. Moya, L. Manosa, A. Planes, T. Krenke, M. Acet, E.F. Wassermann, Martensitic transition and magnetic properties in Ni–Mn–X alloys / Materials Science and Engineering A. 438–440 (2006) 911–915.

DOI: 10.1016/j.msea.2006.02.053

[8] K. Tsuchiya, A. Tsutsumi, H. Nakayama, S. Ishida, H. Ohtsuka, M. Umemoto, Displacive phase transformations and magnetic properties in Ni-Mn-Ga ferromagnetic shape memory alloys, J. Phys. IV France. 112 (2003) 907-910.

DOI: 10.1051/jp4:20031028

[9] E. Y. Panchenko, Y.I. Chumlyakov, E. E. Timofeeva, N. G. Vetoshkina, H. Maier, Cyclic stability of superelasticity in the aged.

[23] oriented Ni49Fe18Ga27Co6 single crystals, Russian Physics Journal. 55 (2013) 1046-1051.