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首页> 外文期刊>International Journal of Plasticity >On the state of deformation in a polycrystalline material in three-dimension: Elastic strains, lattice rotations, and deformation mechanisms
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On the state of deformation in a polycrystalline material in three-dimension: Elastic strains, lattice rotations, and deformation mechanisms

机译：在三维中的多晶材料中变形状态：弹性菌株，晶格旋转和变形机制

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The deformation of polycrystalline zirconium is analysed at the individual grain level using three-dimensional Synchrotron X-ray Diffraction (3D-XRD) in combination with a Crystal Plasticity Finite Element (CPFE) model. The effects of elastic strains and lattice rotations on the shape and position of diffracted peaks are studied in detail. For this purpose, the three dimensional measured microstructure of a commercially pure zirconium (CPZr) sample was imported into a crystal plasticity finite element (CPFE) model to simulate the deformation of measured grains. The calculated lattice rotations and strains of the selected most active grains were subsequently used to forward simulate diffracted peaks. The simulated peaks are then compared to the 3D-XRD measured ones. It is shown that although the sample was deformed to 1.2% strain, soft grains exhibit significant peak smearing. Peak broadening is mostly affected by the deformation induced lattice rotation and less affected by the elastic strains. Further, the comparison of CPFE modelling and 3D-XRD results confirms that prism and basal slip are the most active systems and pyramidal c + a is present but only slightly active. A method is developed to determine the activity of possible slip systems. As an example, by comparing the simulated and measured peak positions as well as the rotations of the most affected diffraction peaks, it is shown that pyramidal a slip system is not active significantly at room temperature.
机译：使用三维同步调节X射线衍射（3D-XRD）与晶体塑性有限元（CPFE）模型的三维同步X射线衍射（3D-XRD）分析多晶锆的变形。详细研究了弹性菌株和晶格旋转对衍射峰的形状和位置的影响。为此目的，将商业纯锆（CPZR）样品的三维测量微观结构进口到晶体塑性有限元（CPFE）模型中以模拟测量晶粒的变形。随后使用所计算的晶格旋转和所选最活性晶粒的菌株来转发模拟衍射峰。然后将模拟峰值与3D-XRD测量的峰进行比较。结果表明，虽然样品变形为1.2％菌株，但柔软的晶粒表现出显着的峰值涂抹。峰值宽度主要受变形诱导的晶格旋转的影响，并且受弹性菌株的影响较小。此外，CPFE建模和3D-XRD结果的比较证实棱镜和基底滑动是最活跃的系统和金字塔型＆ C + A＆存在，但只有略微活跃。开发了一种方法以确定可能的滑动系统的活动。作为示例，通过比较模拟和测量的峰值位置以及最受影响的衍射峰的旋转，示出了金字塔型＆ A＆滑动系统在室温下不显着活跃。

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