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Title: Stress states in individual Si particles of a cast Al-Si alloy: Micro-Raman analysis and microstructure based modeling
Authors: Joseph, Sudha
Kumar, S.
Bhadram, Venkata Srinu
Narayana, Chandrabhas
Keywords: Physical Chemistry
Materials Science
Metallurgy & Metallurgical Engineering
Al-Si alloy
Polarized Raman technique
Finite element modeling
Si modification
Heat treatment
Stress analysis
Metal-Matrix Composites
Issue Date: 2015
Publisher: Elsevier Science Sa
Citation: Journal of Alloys and Compounds
Joseph, S.; Kumar, S.; Bhadram, V. S.; Narayana, C., Stress states in individual Si particles of a cast Al-Si alloy: Micro-Raman analysis and microstructure based modeling. Journal of Alloys and Compounds 2015, 625, 296-308.
Abstract: The stress states in Si particles of cast Al-Si based alloys depend on its morphology and the heat treatment given to the alloy. The Si particles fracture less on modification and fracture more in the heat treated condition. An attempt has been made in this work to study the effect of heat treatment and Si modification on the stress states of the particles. Such understanding will be valuable for predicting the ductility of the alloy. The stress states of Si particles are estimated by Raman technique and compared with the microstructure-based FEM simulations. Combination of Electron Back-Scattered Diffraction (EBSD) and frequency shift, polarized micro-Raman technique is applied to determine the stress states in Si particles with (111) orientations. Stress states are measured in the as-received state and under uniaxial compression. The residual stress, the stress in the elastic-plastic regime and the stress which causes fracture of the particles is estimated by Raman technique. FEM study demonstrates that the stress distribution is uniform in modified Si, whereas the unmodified Si shows higher and more complex stress states. The onset of plastic flow is observed at sharp corners of the particles and is followed by localization of strain between particles. Clustering of particles generates more inhomogeneous plastic strain in the matrix. Particle stress estimated by Raman technique is in agreement with FEM calculations. (C) 2014 Elsevier B.V. All rights reserved.
Description: Restricted access
ISSN: 0925-8388
Appears in Collections:Research Articles (Chandrabhas N.)

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