Abstract In this study, the effect of ceramic nanoparticles addition on the microstructure and texture of friction stir processed (FSP) copper has been investigated. For this purpose, two pure copper plates with and without Al2O3 nanoparticles were FSPed at rotational speed of 800 rpm and traverse speed of 100 mm min−1. Electron back scattered diffraction (EBSD) technique was employed in order to study the microstructure and texture of the fabricated samples. Based on the obtained results, considerable grain refinement by dynamic recrystallization (DRX) mechanism was observed in both specimens. However, Al2O3 inset led to evolution of ultrafine grained (UFG) structure with an average grain size of 0.7 µm. In addition, Al2O3 addition caused formation of lower twin boundaries and stronger texture components compared with the sample without ceramic reinforcements. The presence of nanoparticles increased the proportion of the continuous DRX mechanism (CDRX) compared to the discontinuous mechanism (DDRX) during grain structure formation.

中文翻译：

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在纯铜板中添加陶瓷纳米颗粒：FSP 方法、使用 EBSD 的微观结构演变和织构研究

摘要 在这项研究中，研究了陶瓷纳米颗粒的添加对搅拌摩擦加工 (FSP) 铜的微观结构和织构的影响。为此，以 800 rpm 的转速和 100 mm min-1 的横移速度对两块带有和不带有 Al2O3 纳米颗粒的纯铜板进行 FSP 处理。采用电子背散射衍射（EBSD）技术来研究制造样品的微观结构和织构。根据获得的结果，在两个试样中都观察到了通过动态再结晶（DRX）机制产生的相当大的晶粒细化。然而，Al2O3 嵌入导致平均晶粒尺寸为 0.7 µm 的超细晶粒 (UFG) 结构的演变。此外，与没有陶瓷增强材料的样品相比，添加 Al2O3 导致形成更低的孪晶边界和更强的织构成分。与晶粒结构形成过程中的不连续机制 (DDRX) 相比，纳米粒子的存在增加了连续 DRX 机制 (CDRX) 的比例。