New Insights into Cube Nuclei in Deformed Aluminium
New Insights into Cube Nuclei in Deformed Aluminium
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对变形铝中立方晶核的新见解
DOI：
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发表时间：
2011
期刊：
影响因子：
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通讯作者：
J. Driver
中科院分区：
文献类型：
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作者：
A. Albou;R. Quey;C. Maurice;S. Raveendra;I. Samajdar;P. Dawson;J. Driver
用EBSD研究了平面应变压缩铝合金在热变形和冷变形时立方取向单元的形成。通过使用分裂样品跟踪在400 °C下变形至高达1.2的应变的同一组176个晶粒的取向变化，表明约15%的晶粒可以破碎成具有非常不同取向的几个区域，其特征在于非常大的取向梯度。特别地，那些在立方体的约30°内取向的晶粒形成与其他乳制织构组分接触的立方体取向区。有限元晶体塑性模拟证实了这种机制的创建立方体的塑性变形。在重冷轧（应变为2.3）之后也可以观察到相同类型的微观结构，但是在至少一个数量级上精细得多。在这种情况下，微米尺寸的立方体碎片位于沿着许多晶界或在某些特定晶粒中。当冷变形的样品退火时，相同区域的EBSD观察显示，晶间立方体碎片是非常有效的再结晶形核位点，显然是因为它们具有与局部环境的移动的高角度边界。
The formation of Cube oriented elements in plane strain compressed aluminium has been studied by EBSD for both hot and cold deformations. By following the orientation changes of the same set of 176 grains deformed at 400 °C up to a strain of 1.2 using a split sample, it is shown that about 15% of the grains can break up into several regions of very different orientations, characterized by very large orientation gradients. In particular those grains oriented within about 30° of Cube develop Cube oriented zones in contact with other rolling texture components. Finite element crystal plasticity simulations confirm this mechanism of creation of Cube by plastic deformation. The same type of microstructure can also be observed after heavy cold rolling (strain of 2.3), but at a scale that is much finer by at least an order of magnitude. In this case the micron-sized Cube fragments are located along many grain boundaries or in some particular grains. When the cold deformed sample is annealed, EBSD observations of the same areas reveal that the intergranular Cube fragments are very efficient recrystallization nucleation sites, apparently since they possess mobile high angle boundaries with the local environment.