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首页> 外文会议>Symposium on Structure and Mechanical Properties of Nanophase Materials- Theory and Computer Simulation vs. Experiment Nov 28-30, 2000, Boston, Massachusetts, U.S.A. >Cyclic Deformation and Fatigue Properties of Ultrafine Grain Size Materials: Current Status and Some Criteria for Improvement of the Fatigue Resistance
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Cyclic Deformation and Fatigue Properties of Ultrafine Grain Size Materials: Current Status and Some Criteria for Improvement of the Fatigue Resistance

机译：超细晶粒材料的循环变形和疲劳特性：现状和提高抗疲劳性的一些标准

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摘要

In this review, some general conclusions based on studies performed to date on fatigued materials of ultrafine grain (UFG) size produced by equal channel angular pressing (ECAP) are drawn, and open issues of current interest are defined. Important aspects addressed include the apparent discrepancy between improved fatigue strengths in Woehler (S-N) plots as opposed to inferior fatigue strengths in Manson-Coffin plots, the clarification of the microstructural mechanisms of severe cyclic softening in conjunction with dynamic (local) grain/subgrain coarsening and damaging large-scale catastrophic shear banding. The important roles of the cyclic slip mode, the friction stress, the crystal structure and the temperature of cyclic deformation with respect to stable cyclic deformation behaviour are emphasized. Based on such considerations, criteria are formulated that must be observed, when designing ECAP-processed UFG-materials of superior fatigue strength.
机译：在这篇综述中，基于迄今为止对等通道角向压制（ECAP）产生的超细晶粒（UFG）尺寸的疲劳材料进行的研究得出的一些一般性结论，并定义了当前关注的未解决问题。解决的重要方面包括：Woehler（SN）图的改善的疲劳强度与Manson-Coffin图的较低的疲劳强度之间明显的差异，澄清了严重的循环软化以及动态（局部）晶粒/亚晶粒粗化的微观结构机理并破坏大规模的灾难性剪切带。强调了循环滑模，摩擦应力，晶体结构和循环变形温度对稳定循环变形行为的重要作用。基于这些考虑因素，制定了在设计具有较高疲劳强度的ECAP处理的UFG材料时必须遵守的标准。

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