Semi-solid deformation of Al-Cu alloys: A quantitative comparison between real-time imaging and coupled LBM-DEM simulations
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- 安田, 秀幸
- Department of Materials, Imperial College London
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- O'Sullivan, C.
- Department of Civil and Environmental Engineering, Imperial College London
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- Nagira, T.
- Joining and Welding Research Institute, Osaka University
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- Yasuda, H.
- Department of Materials Science and Engineering, Kyoto University
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- Gourlay, C.M.
- Department of Materials, Imperial College London
抄録
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.
収録刊行物
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- Acta Materialia
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Acta Materialia 163 208-225, 2019-01-15
Elsevier BV
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詳細情報 詳細情報について
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- CRID
- 1050565162985990912
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- NII論文ID
- 120006796405
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- ISSN
- 13596454
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- HANDLE
- 2433/245689
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- 本文言語コード
- en
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- 資料種別
- journal article
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- データソース種別
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