Abstract This study aims to reveal features of the local crystal structure and environment in the quasi-binary TiNi–TiCu alloys containing 25 – 40 at.% Cu, by X-ray diffraction and EXAFS spectroscopy. The alloys were produced in an amorphous state by the melt-spinning technique and then crystallised by isothermal and electropulsing treatment. It was shown that Ni local structure is more disordered in comparison with Cu local environment, which is closer to the conventional crystallographic structure. An increase in the Cu content resulted in the magnification of the disordering in the nearest local environment, around both the Ni and Cu atoms, consisting of Ti atoms. No noticeable effect of the annealing rate on the local structure was found.

中文翻译：

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高铜含量快速淬火TiNiCu形状记忆合金的局部原子和晶体结构

摘要 本研究旨在通过 X 射线衍射和 EXAFS 光谱揭示含有 25-40 at.% Cu 的准二元 TiNi-TiCu 合金的局部晶体结构和环境特征。该合金通过熔融纺丝技术以非晶态生产，然后通过等温和电脉冲处理结晶。结果表明，与Cu局部环境相比，Ni局部结构更无序，更接近常规晶体结构。Cu 含量的增加导致最近局部环境中无序的放大，在 Ni 和 Cu 原子周围，由 Ti 原子组成。未发现退火速率对局部结构的显着影响。