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This article is cited in 2 scientific papers (total in 2 papers)
Mechanical properties, strength physics and plasticity
The mechanism of influence of disperse nanoparticles on parameters of the martensitic transitions in alloys with the shape memory effect
G. A. Malygin Ioffe Institute, St. Petersburg
Abstract:
Within the diffuse martensitic transition theory based on the thermodynamic and kinetic equations and relations, the mechanism of influence of disperse nanoparticles on the parameters of martensitic transitions in alloys with the shape memory effect (SME) is analyzed. The objects of the analysis are the TiNi alloy with the varied sizes of Ti$_{3}$Ni$_{4}$ particle at their constant volume concentration, and the NiMnGaTb alloy with Tb precipitate particles with constant sizes and variation of volume concentration of the precipitates. Information about these alloys is available in the literature. The analysis has shown that, due to the coherent coupling of the Ti$_{3}$Ni$_{4}$ particles with the substrate, the temperature width of the transition $R-B$19$^{'}$ depends on the particle sizes, which confirms the earlier established regularity of the local interior strain influence on this parameter. Concerning the NiMnGaTb alloy, the analysis has shown that, due to the presence of interior local strains associated with the Tb particles, the temperature width of the martensitic transformations increases linearly alongside the growth of the particle concentration in the alloy. The existence of the critical value of the particle concentration, above which the temperature width of the transition becomes indefinitely large, and the martensitic transformation in the alloy is blocked, is shown.
Keywords:
SME alloys, martensitic transitions, disperse nanoparticles, phase transformation dislocations.
Received: 01.07.2019 Revised: 01.07.2019 Accepted: 02.07.2019
Citation:
G. A. Malygin, “The mechanism of influence of disperse nanoparticles on parameters of the martensitic transitions in alloys with the shape memory effect”, Fizika Tverdogo Tela, 61:11 (2019), 2110–2115; Phys. Solid State, 61:11 (2019), 2083–2089
Linking options:
https://www.mathnet.ru/eng/ftt8623 https://www.mathnet.ru/eng/ftt/v61/i11/p2110
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