Structure and phase transformations in copper-alloyed rapidly melt-quenched NiTiHf-based alloys with high-temperature shape memory effect.

Autor: Pushin, A., Pushin, V., Kuranova, N., Kourov, N., Kuntsevich, T., Makarov, V., Uksusnikov, A.
Zdroj: Physics of Metals & Metallography; Oct2017, Vol. 118 Issue 10, p997-1005, 9p
Abstrakt: Methods of transmission and scanning electron microscopy, chemical microanalysis, electron diffraction, and X-ray diffraction have been used to carry out the comparative study of the structure and chemical and phase composition of thin ribbons of four quasi-binary alloys (NiTiHf, NiTiHfCu, NiTiHfCu, and Ni25Ti32Hf18Cu25) obtained in the amorphous state by rapid quenching from the melt by jet spinning. The critical temperatures of the devitrification and B2 ↔ B19′ martensitic transformation of the alloys have been determined based on the data of temperature dependences of the electrical resistivity. The specific features of the formation of the ultrafine-grained structure upon the devitrification and of the phase transformations have been studied depending on the heat-treatment regimes and chemical composition of the alloys (concentration of copper atoms). [ABSTRACT FROM AUTHOR]
Databáze: Complementary Index
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