Atomic-scale study on incoherent twin boundary evolution in nanograined Cu. (September 2020)

• Record Type: Journal Article
• Authors: Zhang, Yong; Guo, Jinming; Ming, Wenquan; Chen, Jianghua; Zhang, Zaoli
• Is Part Of: Scripta materialia. Number 186(2020)
• Page Start: 278
• Page End: 281
• Publication Date: 2020-09
• Subjects: In-situ TEM -- Detwinning -- Incoherent twin boundary -- Grain refinement; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2020.05.052
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: Via in-situ experiments, we show the atomic-scale evolution of incoherent twin boundary (ITB) into a high-angle grain boundary (HAGB). We find that the electron-beam can activate the motion of Shockley partials, which causes detwinning and formation of segmented ITB (sITB). Consequently, a series of step-like extended dislocations are further produced along the sITB due to the Shockley partial cross-slip on two intersecting {111} planes. This process results in an unfixed misorientation (<18°) between the original twins and the un-detwinned parts, and further converts the sITB into a HAGB. The study offers insights into the atomic-scale grain refinement in nano-twinned materials. Graphical abstract: Image, graphical abstract