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首页> 外文会议>International Conference on Materials Structure Micromechanics of Fracture(MSMF-5) >Overview of fatigue behaviour of ultrafine-grained copper produced by severe plastic deformation
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Overview of fatigue behaviour of ultrafine-grained copper produced by severe plastic deformation

机译：严重塑性变形产生超细粒化铜的疲劳行为概述

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Fatigue behaviour of ultrafine-grained copper of purity 99.9 % produced by ECAP technique was studied in a broad region of stress amplitudes. Fatigue strength is by a factor of about 2 higher than that of conventional-grain-size copper in the broad region of fatigue lives from 6 × 10~3 to 2 × 10~(10) cycles. The grain structure is stable and undergoes only very marginal changes during cycling. Fatigue slip markings on specimen surface follow the trace of the shear plane of the last ECAP pass. Fatigue notch sensitivity is also higher than that of conventional-grain-size copper, but not dramatically. The cyclic stress-strain curve of studied copper is temperature insensitive, while its S-N curve is temperature dependent.
机译：在宽的应力幅度区域中研究了通过ECAP技术产生的超细粒度纯度的疲劳行为99.9％。疲劳强度比疲劳的宽度范围内的常规粒度铜的尺寸高约2，从6×10〜3至2×10〜（10）循环中。晶粒结构稳定，在循环过程中仅经历非常边缘变化。样品表面上的疲劳滑差跟随最后一次ECAP通道的剪切平面的痕迹。疲劳缺口敏感性也高于传统晶粒尺寸铜的敏感性，但不显着。研究铜的循环应力 - 应变曲线是温度不敏感，而其S-N曲线是温度依赖性的。

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