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首页> 外文期刊>Materials Science and Engineering >Textural evolution of nanostructured AA5083 produced by ARB
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Textural evolution of nanostructured AA5083 produced by ARB

机译：ARB生产的纳米结构AA5083的组织演变

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The evolution of crystallographic texture as well as microstructure in an AA5083 aluminum alloy during the accumulative roll bonding (ARB) process was investigated by X-ray diffraction and transmission electron microscopy (TEM). It was found that the dominant deformation textures of AA5083 were Copper, Dillamore, Goss, and Brass components. When the number of ARB cycle was increased, the intensity of texture components increased at the beginning, then it became saturated, and finally slightly decreased (for Copper, Dillamore, and Rotated Cube). The ARB-processed samples showed very strong fibers compared to the initial strip with no signs of α-fiber, β-fiber, or τ-fiber. In a general trend, the orientations first move into α-fiber and β-fiber, simultaneously, and finally towards Goss, Brass, Copper, and Dillamore texture components. By increasing the number of ARB cycles, the fraction of low angle grain boundaries was decreased whereas the fraction of high angle grain boundaries fraction was increased. The formation of nano shear bands at the fourth ARB cycle was facilitated by the formation of Brass and Goss components. The formation of nano grains ( < 100 nm) microstructural was also confirmed by transmission electron microscopy (TEM) investigation. At the final ARB cycles, the intensity of major texture components (Copper and Dillamore) was reduced slightly; this can be explained by the formation of equiaxed nano grains due to occurrence of redundant shear strain and continuous recrystallization.
机译：通过X射线衍射和透射电子显微镜（TEM）研究了AA5083铝合金在累积辊压结合（ARB）过程中的晶体织构以及微观结构的演变。发现AA5083的主要变形织构是铜，迪拉摩，高斯和黄铜成分。当ARB循环次数增加时，纹理成分的强度在开始时增加，然后达到饱和，最后略有下降（对于铜，迪拉莫尔和旋转立方体）。与最初的条带相比，ARB处理过的样品显示出非常坚固的纤维，没有α纤维，β纤维或τ纤维的迹象。通常，取向首先同时进入α纤维和β纤维，最后朝向高斯，黄铜，铜和Dillamore纹理分量。通过增加ARB循环的次数，低角度晶界分数减少，而高角度晶界分数增加。黄铜和高斯组分的形成促进了在第四ARB循环时纳米剪切带的形成。透射电镜（TEM）研究也证实了纳米晶粒（<100 nm）微观结构的形成。在最后的ARB循环中，主要纹理成分（铜和迪拉摩）的强度略有降低；这可以通过产生多余的剪切应变和连续重结晶而形成等轴纳米晶粒来解释。

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