Mechanical behavior of nanocrystalline metals
Mechanical behavior of nanocrystalline metals
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DOI：
10.1016/0965-9773(92)90074-8
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发表时间：
1992-03
期刊：
影响因子：
--
通讯作者：
G. Nieman;J. Weertman;R. W. Siegel
中科院分区：
文献类型：
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作者：
G. Nieman;J. Weertman;R. W. Siegel
晶粒尺寸或细胞尺寸对金属力学行为的影响是众所周知的，尽管对缺陷控制机制的细节仍有争议。在过去，难以生产颗粒尺寸小于约1 {mu}m的大块样品限制了细颗粒材料的力学行为研究。从粗粒材料的研究中得出的强度与晶粒尺寸相关的表达式表明，在低同源温度下，将晶粒尺寸减小到亚微米范围会导致机械强度的增加。在高温下，扩散蠕变效应可能导致延展性增加。本文报告了迄今为止正在进行的惰性气体冷凝法制备纳米晶金属的力学行为研究的主要结果；其他地方也报道了一些结果。本文报道的铜、钯和银的抗拉强度、低温蠕变和维氏显微硬度的研究，通过加工研究、x射线晶粒尺寸和应变分析以及纳米结构和微观结构的高分辨率显微镜研究，在更广泛的研究中得到了补充。这项工作为预测受加工条件限制的超细晶金属的低温力学行为提供了基础。参16。， 2个无花果。， 3页。
The influence of grain size or cell size on the mechanical behavior of metals is well known, although debate continues about details of defect control mechanisms. In the past, difficulty in producing bulk samples with grain sizes smaller than about 1 {mu}m limited mechanical behavior studies in finer-grained materials. Expressions relating strength to grain size, determined from studies of coarse-grained materials, suggest that reducing grain size into the sub-micrometer range results in increased mechanical strength at low homologous temperatures. At high temperatures, diffusional creep effects may lead to increased ductility. This paper reports the major results to date of an ongoing study of the mechanical behavior of nanocrystalline metals produced by the inert-gas condensation method; some results have been reported elsewhere. Studies of the tensile strength, low-temperature creep and Vickers microhardness of Cu, Pd and Ag reported here are complemented in this broader study by processing studies, x-ray grain-size and strain analyses, and high resolution microscopy studies of nanostructure and microstructure. The work provides a basis for predicting low-temperature mechanical behavior of ultrafine-grained metals, subject to some significant constraints imposed by the processing conditions. 16 refs., 2 figs., 3 tabs.