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Anomalous behavior of curves of pseudo-elastic deformation of Ni–Fe–Ga–Co alloy crystals as a result of interphase stresses

  • Mechanical Properties, Physics of Strength, and Plasticity
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Abstract

The compression diagram of Ni49Fe18Ga27Co6 alloy crystals in the [011] direction was studied until full shape memory strain at various temperatures in the range of 259–340 K. It is found that all load curves are anomalously shaped and contain portions of sharp and gradual decreases in deformation stresses. Simulation of pseudo-elastic stress–strain curves within the theory of diffuse martensitic transitions, describing not only equilibrium of phases, but also the kinetics of the transition between them, shows that elastic interphase stresses during martensitic reactions Ll 2 → 14M and 14MLl 0 characteristic of this alloy can be responsible for the extraordinary shape of compression diagrams.

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Correspondence to G. A. Malygin.

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Original Russian Text © G.A. Malygin, V.I. Nikolaev, A.I. Averkin, A.P. Zograf, 2016, published in Fizika Tverdogo Tela, 2016, Vol. 58, No. 12, pp. 2400–2405

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Malygin, G.A., Nikolaev, V.I., Averkin, A.I. et al. Anomalous behavior of curves of pseudo-elastic deformation of Ni–Fe–Ga–Co alloy crystals as a result of interphase stresses. Phys. Solid State 58, 2488–2493 (2016). https://doi.org/10.1134/S1063783416120180

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  • DOI: https://doi.org/10.1134/S1063783416120180

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