多晶铜形变显微组织及其再结晶行为

摘要

For polycrystalline copper tensile deformation to a moderate strain, t he microstructure after deformation and after annealing to the start of recrysta llization has been studied by transmission electron microscopy. It is found that different types of deformation microstructures develop depending on the grain o rientation. Quantitative measurement of misorientation and spacing of dislocatio n boundaries induced during deformation has allowed an estimate of the dislocati on density and the stored energy for each types of structures. Upon annealing of the deformed samples, nucleation takes place at the original grain boundaries a nd the nuclei grow into the local region with the highest stored energy.%采用TEM研究了多晶铜形变及再结晶的显微组 织特征。 结果发现： 多晶铜的形 变显微组织表现为3种不同类型， 形变显微组织与晶粒的晶体学取向存在明显的依赖关系 ； 在对不同形变显微组织中位错边界两侧亚晶的取向差及位错边界间距进行定量分析的基础上 ， 估算了每一类型组织的位错密度及其储存能， 发现不同类型组织间存在明显的差别；对 形 变后的试样进行再结晶退火后发现， 再结晶形核机制为晶界弓出形核， 晶界弓出方向为储 存能较高的晶粒。