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首页> 外文期刊>Nuclear Instruments & Methods in Physics Research. B, Beam Interactions with Materials and Atoms >What is the real driving force of bilayer ion beam mixing?
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What is the real driving force of bilayer ion beam mixing?

机译：双层离子束混合的真正驱动力是什么？

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摘要

Molecular dynamics simulations have been used to study the driving force of ion irradiation induced interfacial mixing in metal bilayers in which the relative mass difference of the constituents is considerable. We find no apparent effect of chemical forces, such as heat of mixing or cohesive energy up to 7 keV ion energy, although a considerable number of liquid and high energy particles (hot atoms) persist up to even 20 ps during the thermal spike. This result is in direct conflict with the widely accepted theory of thermal spike mixing (chemical interdiffusion model). Instead we point out the decisive role of hot (energetic) particles in ion beam mixing of bilayers. The supersaturation of vacancies also occurs, which induces a thermally activated intermixing of the lighter constituent of the bilayer. The delay and the decoupling of the intermixing of the light and heavy constituents is explained as a backscattering effect at the interface: the interface acts as a diffusional barrier for high energy light particles. The heavier atoms are predominantly ejected to the overlayer at the beginning of the thermal spike while the light atoms are injected to the bulk at the beginning of the cooling period (in Ti/Pt) or during the thermal spike with some time delay (Al/Pt). We explain ion induced amorphi-zation by the sufficiently high concentration of energetic (hot) atoms in Al/Pt.
机译：分子动力学模拟已被用于研究金属双层中离子辐照引起的界面混合的驱动力，其中组分的相对质量差相当大。我们没有发现化学力的明显影响，例如混合热或高达7 keV离子能量的内聚能，尽管在热尖峰期间，相当数量的液体和高能粒子（热原子）持续高达20 ps。该结果与被广泛接受的热尖峰混合理论（化学互扩散模型）直接冲突。相反，我们指出了热（高能）粒子在双层离子束混合中的决定性作用。空位也发生过饱和，这引起双层的较轻组分的热活化混合。轻质和重质组分混合的延迟和解耦被解释为界面处的反向散射效应：该界面充当了高能轻粒子的扩散屏障。较重的原子主要在热尖峰开始时喷射到上层，而轻原子则在冷却周期开始时（以Ti / Pt表示）或在热尖峰时以一定的时间延迟（Al /点）。我们通过Al / Pt中足够高的高能（热）原子浓度来解释离子诱导的非晶化。

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