Abstract

A study is performed of the local crystal and amorphous structure of Ti₅₀Ni₂₅Cu₂₅ alloy after extreme impacts (megaplastic deformation in a Bridgman chamber and quenching from the liquid state at a rate of 10⁶ K/s). The evolution of the atomic structure in the crystalline state of the alloy during megaplastic deformation on a sample’s surface (EELFS spectroscopy) is compared to the one in the sample’s bulk (EXAFS spectroscopy). There is gradual amorphization of the atomic structure in the bulk of the material. This also occurs in near-surface domains, but to a lesser extent.

中文翻译：

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EXAFS 和 EELFS 光谱分析大块和表面 Ti50Ni25Cu25 合金域在巨塑性变形和熔体淬火的极端冲击下的原子结构

摘要

对Ti ₅₀ Ni ₂₅ Cu ₂₅合金在极端冲击（布里奇曼室中的巨塑性变形和以10 ⁶ K/s的速率从液态淬火）后的局部晶体和非晶结构进行了研究。将样品表面巨塑性变形期间合金结晶状态中原子结构的演变（EELFS 光谱）与样品本体中的原子结构演变（EXAFS 光谱）进行比较。大部分材料的原子结构逐渐非晶化。这也发生在近地表域中，但程度较轻。