Abstract Utilizing plastic strain to modify surface attributes is a common way to improve the functional performance of engineering components. The ability to control the strain distribution in the surface layer is critical for controlling the microstructures and properties of the processed surface. This paper explores the possibility of controlling the surface / subsurface strain distribution in copper by using a wedge-shaped sliding tool of large negative rake angle (≤ −60°). The surface flow and deformation at various sliding conditions are characterized in situ using high speed imaging and image analysis techniques. Deformation fields like flow velocity, strain rate and strain are quantified. It shows the sliding can result in two modes of surface deformation: (1) steady prow deformation with laminar flow and (2) unsteady prow deformation with sinuous flow and surface folding. The former creates a uniformly strained subsurface layer while the latter creates surface defects and inhomogeneous strain field. Utilizing the steady prow deformation and multi-pass sliding technique, the subsurface strain in copper can be controlled in a large strain range (>10). Strategies to control both the strain magnitude and distribution in the subsurface region are discussed. The results indicate the wedge sliding process is a promising method for imposing controllable surface plastic deformation.

中文翻译：

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使用平面应变楔滑动控制铜的表面应变分布

摘要 利用塑性应变修改表面属性是提高工程部件功能性能的常用方法。控制表面层应变分布的能力对于控制加工表面的微观结构和性能至关重要。本文探讨了通过使用大负前角（≤ -60°）的楔形滑动工具来控制铜表面/亚表面应变分布的可能性。使用高速成像和图像分析技术在原位表征各种滑动条件下的表面流动和变形。变形场如流速、应变率和应变被量化。它表明滑动会导致两种表面变形模式：(1) 具有层流的稳定船首变形和 (2) 具有曲折流和表面折叠的不稳定船首变形。前者产生均匀应变的次表面层，而后者产生表面缺陷和不均匀的应变场。利用稳定的船首变形和多道次滑动技术，铜中的亚表面应变可以控制在较大的应变范围内（>10）。讨论了控制地下区域的应变大小和分布的策略。结果表明，楔形滑动过程是一种施加可控表面塑性变形的有前途的方法。利用稳定的船首变形和多道次滑动技术，铜中的亚表面应变可以控制在较大的应变范围内（>10）。讨论了控制地下区域的应变大小和分布的策略。结果表明，楔形滑动过程是一种施加可控表面塑性变形的有前途的方法。利用稳定的船首变形和多道次滑动技术，铜中的亚表面应变可以控制在较大的应变范围内（>10）。讨论了控制地下区域的应变大小和分布的策略。结果表明，楔形滑动过程是一种施加可控表面塑性变形的有前途的方法。