Abstract The relationship between grain boundary sliding (GBS) and slip transmission is investigated experimentally at grain boundaries in 99.99% aluminum with a through-thickness, coarse-grained microstructure deformed in tension at 190 °C. Using scanning electron microscope-enabled digital image correlation (SEM-DIC) and electron backscatter diffraction (EBSD), high-resolution strain fields and microstructural information were measured to examine the influence of microstructural neighborhoods on interactions between GBS and slip transmission and strain localization. Several distinct cases are presented that highlight important microstructural factors that govern deformation near grain boundaries. The findings include (1) direct transmission and GBS were anti-compatible and facilitated by opposing boundary types (low misorientation and high energy grain boundaries respectively); (2) increased GBS activity was correlated with decreased indirect transmission behavior; (3) GBS accommodation at triple junctions was enabled by intragranular plasticity; and (4) the local intragranular plastic strain discontinuity between grains determined the magnitude of GBS gradients. This work provides insight into the nature of these mechanisms and can be used to identify strain transfer criteria that can lead to improved GBS-sensitive crystal plasticity models.

中文翻译：

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微观结构对高纯铝晶界滑动与滑移传递关系的影响

摘要 晶界滑动 (GBS) 与滑动传递之间的关系在 99.99% 铝的晶界处进行了实验研究，该铝具有在 190 °C 下拉伸变形的全厚度粗晶粒显微组织。使用扫描电子显微镜启用的数字图像相关 (SEM-DIC) 和电子背散射衍射 (EBSD)，测量高分辨率应变场和微观结构信息，以检查微观结构邻域对 GBS 与滑动传输和应变定位之间相互作用的影响。提出了几个不同的案例，突出了控制晶界附近变形的重要微观结构因素。研究结果包括（1）直接传输和 GBS 是反相容的，并且由相反的边界类型（分别为低取向差和高能晶界）促进；(2) GBS活性增加与间接传播行为减少相关；(3) 三重连接处的 GBS 调节是由颗粒内可塑性实现的；(4) 晶粒之间的局部晶粒内塑性应变不连续性决定了 GBS 梯度的大小。这项工作提供了对这些机制性质的深入了解，并可用于确定应变转移标准，从而改进 GBS 敏感晶体塑性模型。(3) 三重连接处的 GBS 调节是由颗粒内可塑性实现的；(4) 晶粒之间的局部晶粒内塑性应变不连续性决定了 GBS 梯度的大小。这项工作提供了对这些机制性质的深入了解，并可用于确定应变转移标准，从而改进 GBS 敏感晶体塑性模型。(3) 三重连接处的 GBS 调节是由颗粒内可塑性实现的；(4) 晶粒之间的局部晶粒内塑性应变不连续性决定了 GBS 梯度的大小。这项工作提供了对这些机制性质的深入了解，并可用于确定应变转移标准，从而改进 GBS 敏感晶体塑性模型。