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首页> 外文期刊>Journal of Materials Engineering and Performance >Cyclic Creep of Ultrafine-Grained Pure Cu Under Cyclic Tension Deformation
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Cyclic Creep of Ultrafine-Grained Pure Cu Under Cyclic Tension Deformation

机译：循环张力变形下超细颗粒纯Cu的循环蠕变

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The uniaxial ratcheting behavior of ultrafine-grained pure Cu processed by equal-channel angular pressing (ECAP) was investigated through uniaxial asymmetric cyclic stress-controlled experiments at room temperature. The effects of the mean stress and stress amplitude on the uniaxial ratcheting response and ratcheting life of the ECAP Cu were analyzed. With increasing mean stress or stress amplitude, the ratcheting strain and its rate increased, but the ratcheting life decreased. An approach based on Basquin's method was used to describe the fatigue lifetime of the ECAP pure Cu. Additionally, a power law relationship was adopted to describe the cyclic steady creep rate. Finally, the microscopic and macroscopic fracture features were examined. It was found that at high peak stresses, cyclic creep governs the overall failure process; otherwise, cyclic creep-fatigue interaction is the dominant failure mode.
机译：通过室温下单轴非对称循环应力控制实验，研究了等通道转角挤压（ECAP）处理的超细晶纯铜的单轴棘轮行为。分析了平均应力和应力幅值对ECAP铜的单轴棘轮响应和棘轮寿命的影响。随着平均应力或应力幅值的增加，棘轮应变及其速率增加，但棘轮寿命降低。采用基于Basquin方法的方法来描述ECAP纯铜的疲劳寿命。此外，采用幂律关系来描述循环稳态蠕变速率。最后，检查了微观和宏观断裂特征。研究发现，在峰值应力较高时，循环蠕变控制着整个破坏过程；否则，循环蠕变-疲劳交互作用是主要的失效模式。

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