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Softening Effect on Fracture Stress of Pure Copper Processed by Asynchronous Foil Rolling

机译：异步箔轧制对纯铜断裂应力的软化作用

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摘要

In order to study the size effect on the mechanical property of micro-scale metal, pure copper strips with thicknesses in the range of 20 μm to 600 μm were obtained through the asynchronous foil rolling technology. Progressive mechanical property tests indicated that the pure copper experiences softening effect at a micro-scale when the thickness is below 80 μm, which is contrary to the traditional work hardening theory. The related mechanisms were analyzed and discussed through the observation of microstructure and fracture morphology. The decrease of fracture stress with the decrease of thickness can be attributed to the decreased interfacial energy and dislocation density, which contributes to the release of the cumulative distortion energy and the tendency to soften. In addition, the distribution of misorientation angle and changed Taylor factor with the decrease of thickness are other important factors. The fracture morphology indicated a reduction in the number of micro-voids and the nature of fracture transformed from dimpled pattern to knife edge rupture with thickness. The traditional Hall-Petch relationship is no longer applicable due to the softening effect. A modified Hall-Petch relation considering the distribution of misorientation angle and Taylor factor was established, which provided a better relationship between flow stress and grain size.
机译：为了研究尺寸对微尺度金属力学性能的影响，通过异步箔轧制技术获得了厚度在20μm至600μm范围内的纯铜带。渐进的力学性能测试表明，当厚度小于80μm时，纯铜会在微观尺度上发生软化作用，这与传统的加工硬化理论相反。通过观察组织和断裂形态，分析和讨论了相关机理。断裂应力随厚度的减小而减小，可以归因于界面能和位错密度的降低，这有助于释放累积的变形能和软化趋势。另外，取向差角的分布和随着厚度的减小而改变的泰勒因子也是其他重要因素。断裂形态表明，微孔的数量减少了，并且断裂的性质从凹陷的模式转变为随厚度的刀刃断裂。由于柔化效果，传统的霍尔-Petch关系不再适用。建立了一种修正的霍尔取向关系，该取向关系考虑了取向差角和泰勒因子的分布，从而提供了流应力与晶粒尺寸之间更好的关系。

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