Local flow stresses in interpenetrating-phase composites based on nanoporous gold - In situ diffraction

SCRIPTA MATERIALIA

卷:127

Article

Wang, Ke¹  Hartig, Christian¹  Blankenburg, Malte²  Mueller, Martin²  Guenther, Robert¹  Weissmueller, Joerg¹ 

[1] Hamburg Univ Technol, Inst Mat Phys & Technol, Hamburg, Germany

[2] Helmholtz Zentrum Geesthacht, Inst Mat Res, Geesthacht, Germany

关键词: Nanoporous gold;    Composites;    X-ray diffraction;    Local stress;    Small-scale plasticity;   

DOI  :  10.1016/j.scriptamat.2016.09.026

来源: Elsevier

【 摘 要 】

We report a synchrotron in situ diffraction experiment exploring stress evolution during compression of interpenetrating-phase nanocomposites based on nanoporous gold and polymer. While previous experiments provided indirect indication of local flow conditions based on macroscopic effective flow stress and micromechanics models such as Gibson-Ashby scaling law, the lattice parameter data of our experiment access the flow stress directly. At small structure size we find excellent agreement with previous reports, supporting the match between material and model of those studies. Yet, deviations at larger structure size suggest that coarsening generates defects in metal network structure that are ignored by standard models. (C) 2016 Acta Materialia Inc. Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license.

【 授权许可】

Free