Self-propagating crystallization waves in the TiCu amorphous alloy


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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.

About the authors

A. S. Rogachev

Institute of Structural Macrokinetics and Materials Science

Author for correspondence.
Email: rogachev@ism.ac.ru
Russian Federation, Chernogolovka, Moscow region, 142432

S. G. Vadchenko

Institute of Structural Macrokinetics and Materials Science

Email: rogachev@ism.ac.ru
Russian Federation, Chernogolovka, Moscow region, 142432

A. S. Shchukin

Institute of Structural Macrokinetics and Materials Science

Email: rogachev@ism.ac.ru
Russian Federation, Chernogolovka, Moscow region, 142432

I. D. Kovalev

Institute of Structural Macrokinetics and Materials Science

Email: rogachev@ism.ac.ru
Russian Federation, Chernogolovka, Moscow region, 142432

A. S. Aronin

Institute of Solid State Physics

Email: rogachev@ism.ac.ru
Russian Federation, Chernogolovka, Moscow region, 142432

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