During plastic deformation, the change of structural states is known to be complicated and indeterminate, even in single crystals. This contributes to some enduring problems like the prediction of deformed texture and the commercial applications of such material. In this work, plane strain compression (PSC) tests were designed and implemented on single crystal pure aluminum to reveal the deformation mechanism. PSC tests were performed at different strain rates under strain control in either one-directional or two-directional compression. The deformed microstructures were analyzed according to the flow curve and the electron back-scattered diffraction (EBSD) mappings. The effects of grain orientation, strain rate, and strain path on the deformation and mechanical response were analyzed. Experimental results revealed that the degree of lattice rotation of one-dimensional compression mildly dependents on cube orientation, but it is profoundly sensitive to the strain rate. For two-dimensional compression, the softening behavior is found to be more pronounced in the case that provides greater dislocations gliding freeness in the first loading. Results presented in this work give new insights into aluminum deformation, which provides theoretical support for forming and manufacturing of aluminum.

中文翻译：

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了解应变路径对单晶纯铝变形微观结构的影响

在塑性变形过程中，即使在单晶中，结构状态的变化也是复杂且不确定的。这导致了一些持久的问题，例如变形纹理的预测和此类材料的商业应用。在这项工作中，在单晶纯铝上设计并实施了平面应变压缩 (PSC) 测试，以揭示变形机制。PSC 测试是在单向或双向压缩的应变控制下以不同的应变率进行的。根据流动曲线和电子背散射衍射 (EBSD) 映射分析变形的微观结构。分析了晶粒取向、应变速率和应变路径对变形和力学响应的影响。实验结果表明，一维压缩的晶格旋转程度轻微地依赖于立方体取向，但它对应变率非常敏感。对于二维压缩，发现在第一次加载中提供更大的位错滑动自由度的情况下，软化行为更加明显。这项工作中提出的结果为铝变形提供了新的见解，为铝的成型和制造提供了理论支持。