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首页> 外文期刊>Philosophical magazine, B. Physics of condensed matter, electronic, optical, and magnetic properties >Nanostructured metals produced by physical vapour deposition for structural and gas-reactive applications
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Nanostructured metals produced by physical vapour deposition for structural and gas-reactive applications

机译：通过物理气相沉积生产的纳米结构金属，用于结构和气体反应性应用

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This paper highlights some of the research being conducted at the Naval Research Laboratory on nanostructured materials synthesized by the inert-gas condensation method. This research effort was initially concentrated on the development of metal-based nanocomposites for high-temperature structural applications. The nanocomposite approach, used in this initial phase, was based on a strengthening concept that involved the use of nearly immiscible constituents: a ductile matrix and a particulate reinforcing phase. Following this approach, we produced copper-niobium, silver-nickel and copper-aluminium nanocomposites. The experimental results obtained on these nanocomposite systems were mixed. They did display some degree of strength enhancement and high-temperature strength retention. However, the results clearly pointed out certain processing challenges associated with the issues of oxide contamination and consolidation of nanostructured metals and alloys by conventional processing. In the course of this research, the recognition of the highly reactive nature of nanocrystalline metals, owing to their high specific surface areas, led us to consider the potential of nanostructured metals and alloys for gas-reactive applications. Accordingly, we have conducted initial studies on nanocrystalline palladium for hydrogen-sensing applications. The paper concludes by reconsidering the question of nanocomposites for structural applications within the context of some interesting and promising results of Valiev and of Inoue and Kimura who have produced metallic nanocomposites through two different routes that are both based on well established metallurgical practices.
机译：本文重点介绍了海军研究实验室针对通过惰性气体冷凝法合成的纳米结构材料进行的一些研究。这项研究工作最初集中于开发用于高温结构应用的金属基纳米复合材料。在此初始阶段使用的纳米复合材料方法基于一种强化概念，其中涉及到使用几乎不混溶的成分：韧性基质和颗粒强化相。按照这种方法，我们生产了铜铌，银镍和铜铝纳米复合材料。混合了在这些纳米复合材料系统上获得的实验结果。它们确实显示出一定程度的强度增强和高温强度保持性。但是，结果清楚地指出了某些加工挑战，这些挑战与氧化物污染以及通过常规加工固结的纳米结构金属和合金有关。在这项研究的过程中，由于纳米晶体金属的高比表面积，其对高反应性的认识使我们考虑了纳米结构金属和合金在气体反应性应用中的潜力。因此，我们已经对用于氢感测应用的纳米晶钯进行了初步研究。本文的结尾是在Valiev和Inoue和Kimura提出了一些有趣且有希望的结果的背景下重新考虑纳米复合材料在结构上的应用问题，他们通过两种不同的途径生产了金属纳米复合材料，这两种方法均基于完善的冶金实践。

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