Atom Movement in Pure Cu and Cu-Ni Alloy Single Crystals under Ion-Beam Irradiation

高能离子束与固体的相互作用以及在离子束照射下引起的材料性质变化一直是人们关注的问题，无论是从基本认识还是应用上都是如此。为了理解这一现象，人们已经从理论上和实验上做了大量的工作。尽管离子束辐照对材料进行改性已广泛应用于各个工程领域，但离子束辐照引起的相互作用和材料性质变化过程尚未完全了解，仍然是一个基础科学问题。在这项研究中，卢瑟福后向散射和通道测量被应用于研究深辐射损伤和深度分布的植入金原子在纯Cu和Cu-1at。% Ni合金单晶试样，室温下用300 keV Au+离子束辐照，辐照剂量为2 × 10^<16 b>离子/cm^2。纯Cu样品中注入Au原子的损伤范围和深度范围明显大于Cu-1at样品。% Ni合金。本文提出了离子束辐照下固体中原子运动的一种机制。

Interaction of energetic ion beams with solids and materials property change induced under ion-beam irradiatin have long been attracting attention from both points of view of its basic understanding and application. In order to understand the phenomena, a large number of works have already been performed both theoretically and experimentally. However, the process of the interaction and material property change induced under ion-beam irradiation have not yet been fully understood and still remain as a field of fundamental scientific problems, although material modification by ion-beam irradiation has widely been applied in various engineering fields.In this study, Rutherford backscattering and channeling measurements have been applied to investigate both deep radiation damage and depth profile of implanted Au atoms in pure Cu and Cu-1at.% Ni alloy single-crystal specimens, which were irradiated off axis at room temperature by 300 keV Au+ ions to a dose of 2x10^<16> ions/cm^2. The damage range and depth range of the implanted Au atoms in the specimens of pure Cu were strikingly deeper than those in the specimens of Cu-1at.% Ni alloys, respectively. An atom movement mechanism in solids under ion beam irradiation is proposed as the origin of the observed results.