Physics of Thermoelastic Martensitic Transformation in High-Strength Single Crystals

Abstract:

The thermoelastic martensitic transformations, shape memory effect and superelasticity in high-strength single crystals of ferromagnetic FeNiCoAlX (X = Ta, Nb, Ti), CoNiGa, NiFeGaCo alloys and TiNi alloy in monophase and heterophase states with nanoscale dispersed particles are investigated. The dependences of the thermal and stress hysteresis, superelasticity temperature range, reversible transformation strain on the size of the dispersed particles, crystal orientation, stress state, level of applied stress and test temperature are obtained. The criteria of high-temperature superelasticity and the conditions for narrow thermal and stress hysteresis, large value of reversible transformation strain, which exceeds the theoretical lattice strain, are established. The thermodynamic description of the effect of particles on the stress-induced martenstic transformation in single crystals of new high-ferromagnetic alloys are elaborated.

• Periodical: Materials Science Foundations (Volumes 81-82)
• Pages: 107-173
• DOI: https://doi.org/10.4028/www.scientific.net/MSFo.81-82.107
• Online since: March 2015
• Authors: Yuriy Chumlyakov*, Irina V. Kireeva, Elena Panchenko, Ekaterina Timofeeva, Irina V. Kretinina, Olga A. Kuts
• Keywords: Dispersed Particles, Ferromagnetic Alloys, High-Strength Single Crystals, Shape Memory Effects (SME), Superelasticity, Thermoelastic Martensitic Transformation

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