In-situ synchrotron X-ray diffraction study of dual-step strain variation in laser shock peened metallic glasses. (May 2018)

• Record Type: Journal Article
• Authors: Wang, Liang; Zhao, Yakai; Wang, Lu; Nie, Zhihua; Wang, Benpeng; Xue, Yunfei; Zhang, Haifeng; Fu, Huameng; Brown, Dennis E.; Ren, Yang
• Is Part Of: Scripta materialia. Number 149(2018)
• Page Start: 112
• Page End: 116
• Publication Date: 2018-05
• Subjects: Metallic glass -- Laser shock peening -- In-situ synchrotron X-ray diffraction -- Flow unit interconnection; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2018.02.019
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: Atomic-structure evolution is significant in understanding the deformation mechanism of metallic glasses. Here, we firstly find a dual-step atomic strain variation in laser-shock-peened (LSPed) metallic glasses during compression tests by using in-situ synchrotron X-ray diffraction. Under low compressive load, LSP-deformed zone's atomic-structure shows low Young's Modulus ( E ); with load increase, atomic-structure are re-hardened, showing high E . An atomic deformation mechanism is proposed by using flow unit model, that LSP could induce interconnected flow units and homogenize the atomic-structure. These interconnected flow units are metastable and start to annihilate during compressive loading, causing the dual-step atomic strain variation. Graphical abstract: Unlabelled Image