Abstract
Self-propagating crystallization waves are detected and experimentally demonstrated in the Ti50Cu50 amorphous alloy obtained by the melt spinning (ultrafast quenching) method. High-speed thermographic recording has shown that crystallization waves can appear spontaneously at the heating of an amorphous strip to 300–350°С or at the local initiation by a hot tungsten coil of a small segment of the strip preliminarily heated to 230–250°С. In the former case, the crystallization wave propagates at a velocity of ~7 cm/s; in the latter case, the crystallization wave propagates in a self-oscillation mode at an average velocity of ~1.2 cm/s. The temperature gradient across the wavefront is about 150°С. The samples crystallized in the self-oscillation mode have a characteristic banded structure with a smaller grain in depression regions. The crystallization product in all samples is the TiCu tetragonal intermetallic phase.
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Original Russian Text © A.S. Rogachev, S.G. Vadchenko, A.S. Shchukin, I.D. Kovalev, A.S. Aronin, 2016, published in Pis’ma v Zhurnal Eksperimental’noi i Teoreticheskoi Fiziki, 2016, Vol. 104, No. 10, pp. 740–744.
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Rogachev, A.S., Vadchenko, S.G., Shchukin, A.S. et al. Self-propagating crystallization waves in the TiCu amorphous alloy. Jetp Lett. 104, 726–729 (2016). https://doi.org/10.1134/S0021364016220124
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DOI: https://doi.org/10.1134/S0021364016220124