期刊
ACTA MATERIALIA
卷 163, 期 -, 页码 208-225出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2018.10.006
关键词
Semi-solid; Dilatancy; Synchrotron radiation; Image analysis; Discrete element method
资金
- EPSRC [EP/K026763/1]
- Imperial College London
- [17H06155]
- EPSRC [EP/K026763/1, EP/N007638/1, EP/M002241/1] Funding Source: UKRI
Semi-solid alloys are deformed in a wide range of casting processes; an improved understanding and modelling capability is required to minimise defect formation and optimise productivity. Here we combine thin-sample in-situ X-ray radiography of semisolid Al-Cu alloy deformation at 40-70% solid with 2D coupled lattice Boltzmann method - discrete element method (LBM-DEM) simulations. The simulations quantitatively capture the key features of the in-situ experiments, including (i) the local contraction and dilation of the grain assembly during shear deformation; (ii) the heterogeneous strain fields and localisation features; (iii) increases in local liquid pressure in regions where liquid was expelled from the free surface in the experiment; and (iv) decreases in liquid pressure in regions where surface menisci are sucked-in in experiments. The verified DEM simulations provide new insights into the role of initial solid fraction on the stress-deformation response and support the hypothesis that the behaviour of semi-solid alloys can be described using critical state soil mechanics. (C) 2018 Acta Materialia Inc. Published by Elsevier Ltd.
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