Abstract In this study we present an integrated experimental and computational study of the effect of twin crystallographic orientation on local deformation characteristics that govern its subsequent growth. Experimentally measured intra-twin geometrically necessary dislocations (GND) density and twin-resolved shear stress (TRSS) differences within twins are found to vary with twin crystallographic orientation, which is characterised in terms of inclination angle (that between the loading direction and twin c-axis). Shear transformation modelling of four particular twins with increasing inclination angle shows that the latter dominates both slip and TRSS within the twin. Model predictions and experimental measurements show that intra-twin average GND density increases with inclination angle, and that a reversal in the sign of intra-twin TRSS occurs as the inclination angle increases. This implies that the TRSS (backstress) within a twin is not always negative, which further suggests that the rate of twin growth is influenced by its own crystallographic orientation instead of global Schmid factor (which is based on parent grain orientation).

中文翻译：

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具有振幅、频率和磁相关性的各向同性磁敏橡胶粘弹塑性本构模型

摘要 在这项研究中，我们提出了双晶取向对控制其后续生长的局部变形特征的影响的综合实验和计算研究。实验测量的孪晶内几何必要位错 (GND) 密度和孪晶内双分辨剪切应力 (TRSS) 差异被发现随孪晶晶向而变化，其特征在于倾角（加载方向和孪晶 c 之间的倾角）。 -轴）。随着倾斜角的增加，四个特定孪晶的剪切变换模型表明，后者在孪晶内主导滑移和 TRSS。模型预测和实验测量表明，孪晶内平均 GND 密度随着倾角的增加而增加，并且随着倾斜角的增加，双胞胎内 TRSS 的符号发生反转。这意味着孪晶内的 TRSS（背应力）并不总是负值，这进一步表明孪晶生长速率受其自身晶体取向而不是全局 Schmid 因子（基于母体晶粒取向）的影响。