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相比于传统的晶体择尤取向(晶体织构,简称织构),晶界面择尤取向是一个新的科学问题.系统地研究晶界面择尤取向的形成规律和演化机制对合理调控显微组织结构以显著改善材料的各种使用性能具有非常重要的科学意义和应用价值.本文利用基于体视学原理和电子背散射衍射技术的晶界特征分布五参数表征分析方法,研究了冷轧变形高纯铝(99.99%)再结晶晶界面的择尤取向问题.结果表明,在再结晶及晶粒长大过程中,晶界面择尤取向由最初的{2 2 3}晶面转变为{1 1 1}晶面,最后取向在{1 0 0}晶面上.分析指出,冷轧变形高纯铝再结晶组织中,小角度晶界(取向差介于2°~15°)是其晶界构成的主体部分;在晶粒长大过程中,晶体织构由{1 1 0}<1 1 2>黄铜织构为主转变为以{0 1 1}<1 0 0>高斯织构和{0 2 3}<1 0 0>织构共存为主,受晶面能和晶体织构的影响,小角度晶界一般择尤取向于可形成能量较低的倾侧型小角度晶界所对应的晶面上.这是导致高纯铝再结晶晶界面择尤取向随晶粒长大而发生上述规律性变化的主要原因.
Compared with the traditional crystal orientation (crystal texture, referred to as the texture), the grain boundary orientation is a new scientific problem.Studying systematically the formation regularity and evolution mechanism of the grain boundary orientation is of great importance to the reasonable regulation of microstructure Organization structure to significantly improve the various properties of the material has very important scientific significance and application value.In this paper, based on the principles of stereology and electron backscatter diffraction characteristics of the grain boundary five-parameter characterization analysis method, the cold-rolled deformation In the process of recrystallization and grain growth, the orientation of the grain boundary is changed from the original {2 2 3} plane to the {1 1 1} crystal plane, and the final orientation is on the {1 0 0} crystal plane. It is pointed out that the low-angle grain boundaries (orientation difference between 2 ° and 15 °) in the high-purity aluminum recrystallized structure of cold- In the grain growth process, the crystal texture changes from {1 1 0} <1 1 2> to (0 1 1} <100> Gaussian texture And {0 2 3} <1 0 0> texture coexist mainly by the crystal surface energy and the impact of crystal texture, the small-angle grain boundaries are generally preferred in particular to form Small amounts of lower tilt angle grain boundaries corresponding to the crystal plane. This results in a high purity aluminum is the main reason for re-alignment, especially with the optional interface grain growth occurs in the above-described regular crystal grain change.