In-situ synchrotron X-ray diffraction study of dual-step strain variation in laser shock peened metallic glasses

Journal Article · 09 March 2018 · Scripta Materialia

DOI: https://doi.org/10.1016/j.scriptamat.2018.02.019 · OSTI ID:1480299

Wang, Liang ^[1]; Zhao, Yakai ^[1]; Wang, Lu ^[2]; Nie, Zhihua ^[1]; Wang, Benpeng ^[1]; Xue, Yunfei ^[2]; Zhang, Haifeng ^[3]; Fu, Huameng ^[3]; Brown, Dennis E. ^[4]; Ren, Yang ^[5]

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1. Beijing Institute of Technology, Beijing (China)
2. Beijing Institute of Technology, Beijing (China); National Key Lab. of Science and Technology on Materials under Shock and Impact, Beijing (China)
3. Chinese Academy of Sciences, Shenyang (China)
4. Northern Illinois Univ., DeKalb, IL (United States)
5. Argonne National Lab. (ANL), Argonne, IL (United States)

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 2 homogenize the atomic-structure. Furthermore, these interconnected flow units are metastable and start to annihilate during compressive loading, causing the dual-step atomic strain variation.

• Research Organization: Argonne National Lab. (ANL), Argonne, IL (United States)
• Sponsoring Organization: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Scientific User Facilities Division; National Natural Science Foundation of China (NSFC)
• Grant/Contract Number: AC02-06CH11357
• OSTI ID: 1480299
• Journal Information: Scripta Materialia, Journal Name: Scripta Materialia Journal Issue: C Vol. 149; ISSN 1359-6462
• Publisher: ElsevierCopyright Statement
• Country of Publication: United States
• Language: English