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Diffusion creep in metals and ceramics: Extension to nanocrystals

机译:金属和陶瓷中的扩散蠕变:扩展到纳米晶体

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摘要

The fundamental aspects of diffusion creep are examined with reference to creep parameters and microstructural development. It is demonstrated that there is strong microstructural support for diffusion creep, although the theoretical and experimental creep rates are likely to agree only to within an order of magnitude. This discrepancy arises partly from uncertainties in the diffusion coefficients, and also from a lack of consideration of the stochastic nature of grain size distribution. Models developed for creep in nanocrystals are examined critically. Currently, there is no good experimental evidence for the occurrence of conventional diffusion creep in nanocrystals.
机译:参照蠕变参数和微观结构发展对扩散蠕变的基本方面进行了研究。事实证明,尽管理论和实验蠕变速率可能仅在一个数量级内一致,但对扩散蠕变具有强大的微观结构支持。这种差异部分源于扩散系数的不确定性,也源于对晶粒尺寸分布的随机性缺乏考虑。严格审查了为纳米晶体中的蠕变开发的模型。目前,尚无关于纳米晶体中常规扩散蠕变发生的良好实验证据。

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