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

SCRIPTA MATERIALIA

卷:149

Article

Wang, Liang¹  Zhao, Yakai¹  Wang, Lu^1,2  Nie, Zhihua¹  Wang, Benpeng³  Xue, Yunfei^1,2  Zhang, Haifeng⁴  Fu, Huameng⁴  Brown, Dennis E.⁵  Ren, Yang⁶ 

[1] Beijing Inst Technol, Sch Mat Sci & Engn, Beijing 100081, Peoples R China

[2] Natl Key Lab Sci & Technol Mat Shock & Impact, Beijing 100081, Peoples R China

[3] Beijing Inst Technol, Sch Mech Engn, Beijing 100081, Peoples R China

[4] Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Liaoning, Peoples R China

[5] Northern Illinois Univ, Dept Phys, De Kalb, IL 60115 USA

[6] Argonne Natl Lab, Xray Sci Div, Argonne, IL 60439 USA

关键词: Metallic glass;    Laser shock peening;    In-situ synchrotron X-ray diffraction;    Flow unit interconnection;   

DOI  :  10.1016/j.scriptamat.2018.02.019

来源: Elsevier

【 摘 要 】

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. (C) 2018 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

【 授权许可】

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