Abstract
The effect of alloying by 12–20 at % Hf on the structure, the phase composition, and the thermoelastic martensitic transformations in ternary alloys of the quasi-binary NiTi–NiHf section is studied by transmission electron microscopy, scanning electron microscopy, electron diffraction, and X-ray diffraction. The electrical resistivity is measured at various temperatures to determine the critical transformation temperatures. The data on phase composition are used to plot a full diagram for the high-temperature thermoelastic B2 ↔ B19’ martensitic transformations, which occur in the temperature range 320–600 K when the hafnium content increases from 12 to 20 at %. The lattice parameters of the B2 and B19’ phases are measured, and the microstructure of the B19’ martensite is analyzed.
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Original Russian Text © V.G. Pushin, N.N. Kuranova, A.V. Pushin, A.N. Uksusnikov, N.I. Kourov, 2016, published in Zhurnal Tekhnicheskoi Fiziki, 2016, Vol. 86, No. 7, pp. 51–56.
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Pushin, V.G., Kuranova, N.N., Pushin, A.V. et al. Structure and thermoelastic martensitic transformations in ternary Ni–Ti–Hf alloys with a high-temperature shape memory effect. Tech. Phys. 61, 1009–1014 (2016). https://doi.org/10.1134/S1063784216070203
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DOI: https://doi.org/10.1134/S1063784216070203