Influence of Amorphous State Local Structure in Tinicu Alloys on Structure and Phase Transformations during Crystallization

The study of TiNiCu alloy samples in the initial state after quenching by EXAFS revealed the dependence of the local atomic structure of the alloys on the copper content. Studies of the structure of alloys by X-ray diffraction (XRD) using synchrotron radiation with a wavelength of 0.8 Å showed that in the initial state after quenching, the alloys are in an amorphous state. After isothermal crystallization of alloys at a temperature of 500° C for 300 s, it was found that samples of alloys with a copper content of more than 30 at.% after crystallization became so brittle that they were unsuitable for further research. This is a consequence of the peculiarities of the local atomic structure of the alloys identified by the EXAFS method. Temperature intervals and the nature of alloy phase martensitic transformations (MT) were determined by differential scanning calorimetry (DSC).