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Abstract <p>The article examines the processes of crystalline phase formation in rapidly quenched amorphous-crystalline ribbons of the Ti<sub>50</sub>Ni<sub>25</sub>Cu<sub>25</sub> alloy (at %) during electropulse treatment (EPT) with a single electric current pulse lasting 1 ms. A sequential series of processed ribbon samples was obtained with increasing heating levels before and after reaching the recrystallization temperature of the amorphous part of the ribbons at current densities ranging from 680 to 900 A/mm<sup>2</sup>. Studies of the microstructure of the cross sections of the treated samples and calorimetric effects during martensitic transformations (MT) showed a correlation between the magnitude and nature of the MT and the observed microstructure of the ribbons after EPT with varying degrees of annealing. An increase in energy input during EPT leads to the formation of a more homogeneous crystalline structure in the ribbon, characterized predominantly by columnar crystals growing from the ribbon surfaces inward and meeting in its central part. With increasing energy input, the MT temperatures rise, and the peak temperature of the austenitic transformation in the treated samples changes from 39.0°C in the initial state to 64.5°C at a current density of 891 A/mm<sup>2</sup>. After EPT at current densities above 758 A/mm<sup>2</sup>, the samples exhibit a shape memory effect during thermal cycling within the range of martensitic transformation.</p>

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Features of the Formation of the Crystalline Phase in Rapidly Quenched Amorphous Crystalline Ribbons of Ti50Ni25Cu25 Alloy Depending on Energy Input during Electropulse Treatment

  • 期刊论文

  • 发表日期：

    2025年12月21日

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  • N. N. Sitnikov,
  • S. V. Greshnyakova,
  • I. A. Zaletova,
  • A. V. Shelyakov

摘要

Abstract

The article examines the processes of crystalline phase formation in rapidly quenched amorphous-crystalline ribbons of the Ti50Ni25Cu25 alloy (at %) during electropulse treatment (EPT) with a single electric current pulse lasting 1 ms. A sequential series of processed ribbon samples was obtained with increasing heating levels before and after reaching the recrystallization temperature of the amorphous part of the ribbons at current densities ranging from 680 to 900 A/mm2. Studies of the microstructure of the cross sections of the treated samples and calorimetric effects during martensitic transformations (MT) showed a correlation between the magnitude and nature of the MT and the observed microstructure of the ribbons after EPT with varying degrees of annealing. An increase in energy input during EPT leads to the formation of a more homogeneous crystalline structure in the ribbon, characterized predominantly by columnar crystals growing from the ribbon surfaces inward and meeting in its central part. With increasing energy input, the MT temperatures rise, and the peak temperature of the austenitic transformation in the treated samples changes from 39.0°C in the initial state to 64.5°C at a current density of 891 A/mm2. After EPT at current densities above 758 A/mm2, the samples exhibit a shape memory effect during thermal cycling within the range of martensitic transformation.