Orientation-dependent phenomenon, which is ubiquitous in polycrystals and proceeds from plastically anisotropy within each grain, give rise to a non-uniform microstructure evolution. This study focuses on the microstructural evolution of two as-rolled tungsten (W) with different purity: one is technical pure and one is artificially contaminated with trace C, O, N, etc. The results show that impurities can improve the microstructural uniformity during annealing, by weakening the orientation dependence of recrystallization behavior. Local EBSD characterizations provide strong supports for this proposal: firstly, while {100} and {111} grain have disparity in their slip patterns in the pure sample, it is observed intriguing similarity in the contaminated sample; secondly, the stored energy difference between {111} and {100} grains is reduced by the introduction of impurities. Additionally, the attributes of the geometrically necessary dislocations (GNDs) of both samples were also investigated. While plastically strained {111} grain accumulates more GNDs than {100} grain in pure W, the contaminated W exhibits the reduced ratio of GND density in {111} grain to {100} grain. Overall, the impurities may play the role as homogenizer in plastic behavior and subsequent microstructural evolution of polycrystalline systems.

取向相关现象在多晶中普遍存在，并且源自每个晶粒内的塑性各向异性，导致不均匀的微观结构演变。本研究重点研究了两种不同纯度的轧制态钨 (W) 的显微组织演变：一种是技术纯的，一种是人工污染的微量 C、O、N 等。结果表明，杂质可以提高加工过程中的显微组织均匀性。退火，通过减弱再结晶行为的取向依赖性。局部 EBSD 表征为该提议提供了强有力的支持：首先，虽然 {100} 和 {111} 晶粒在纯样品中的滑移模式存在差异，但在受污染的样品中观察到有趣的相似性；第二，{111} 和 {100} 晶粒之间的储存能量差异因杂质的引入而减小。此外，还研究了两个样品的几何必要位错 (GND) 的属性。虽然塑性应变的 {111} 晶粒比纯 W 中的 {100} 晶粒积累更多的 GND，但受污染的 W 表现出 {111} 晶粒与 {100} 晶粒中 GND 密度的比率降低。总的来说，杂质可能在多晶系统的塑性行为和随后的微观结构演变中起到均质剂的作用。受污染的 W 表现出 {111} 晶粒与 {100} 晶粒中 GND 密度的比率降低。总的来说，杂质可能在多晶系统的塑性行为和随后的微观结构演变中起到均质剂的作用。受污染的 W 表现出 {111} 晶粒与 {100} 晶粒中 GND 密度的比率降低。总的来说，杂质可能在多晶系统的塑性行为和随后的微观结构演变中起到均质剂的作用。