Abstract

The formation of nanowhiskers in tungsten-containing syntactic foam under nanosecond relativistic electron beam has been experimentally studied. It has been demonstrated that a single impact of relativistic electron beam with a flux density of 230–240 J/cm² and a total pulse duration of 150 ns on syntactic foam leads to the collapse of microspheres of more than 40 μm in diameter with the formation of filamentous structures up to 10 μm in length and about 100 nm in diameter on their surface. There is complex kinetics of substance ablation from the irradiated surface at a gas-plasma formation expansion rate of ~13 km/s. It has been found that nanowhiskers do not form near the emission “crater” from syntactic foam where the duration of the mechanical pressure pulse is minimal and close to the relativistic electron beam impact.

中文翻译：

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纳秒相对论电子束在含钨句法泡沫中形成纳米晶须

摘要

实验研究了纳秒相对论电子束在含钨复合泡沫中纳米晶须的形成。已经证明，相对论电子束的单次冲击的通量密度为230–240 J / cm ²句法泡沫上的总脉冲持续时间为150 ns，会导致直径大于40μm的微球坍塌，并在其表面形成长达10μm，直径约100 nm的丝状结构。在〜13 km / s的气体等离子体形成膨胀速率下，从被辐射表面烧蚀物质的动力学很复杂。已经发现，在机械压力脉冲的持续时间最小且接近相对论电子束冲击的句法泡沫的发射“弹坑”附近不会形成纳米晶须。