Deformation behaviour of Rheocast A356 Al alloy at microlevel considering approximated RVEs

Islam, Sk Tanbir and Das, Prosenjit and Das, Santanu (2015) Deformation behaviour of Rheocast A356 Al alloy at microlevel considering approximated RVEs. In: METALS AND MATERIALS INTERNATIONAL, 21 (2). pp. 311-323. (In Press)

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Abstract

A micromechanical approach is considered here to predict the deformation behaviour of Rheocast A356 (Al-Si-Mg) alloy. Two representative volume elements (RVEs) are modelled in the finite element (FE) framework. Two dimensional approximated microstructures are generated assuming elliptic grains, based on the grain size, shape factor and area fraction of the primary Al phase of the said alloy at different processing condition. Plastic instability is shown using stress and strain distribution between the Al rich primary and Si rich eutectic phases under different boundary conditions. Boundary conditions are applied on the approximated RVEs in such a manner, so that they represent the real life situation depending on their position on a cylindrical tensile test sample. FE analysis is carried out using commercial finite element code ABAQUS without specifying any damage or failure criteria. Micro-level in-homogeneity leads to incompatible deformation between the constituent phases of the rheocast alloy and steers plastic strain localisation. Plastic stain localised regions within the RVEs are predicted as the favourable sites for void nucleation. Subsequent growth of nucleated voids leads to final failure of the materials under investigation.

Item Type:	Journal Article
Publication:	METALS AND MATERIALS INTERNATIONAL
Publisher:	KOREAN INST METALS MATERIALS
Additional Information:	Copy right for this article belongs to the KOREAN INST METALS MATERIALS, KIM BLDG 6TH FLOOR, SEOCHO-DAERO 56 GIL 38, SEOCHO-GU, SEOUL 137-881, SOUTH KOREA
Keywords:	alloys; casting; mechanical properties; microstructure; image analysis; computer simulation
Department/Centre:	Division of Mechanical Sciences > Mechanical Engineering
Date Deposited:	24 Apr 2015 05:56
Last Modified:	24 Apr 2015 05:56
URI:	http://eprints.iisc.ac.in/id/eprint/51384

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