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Study of the influence of silicon phase morphology on the microstructural stress distribution in Al-Si alloys using object oriented finite element modeling
Nadimpalli Raghukiran, ,
Published in
2014
Volume: 16
   
Issue: 1
Pages: 112 - 121
Abstract

Near-eutectic Al-Si alloys were produced by conventional casting and spray forming resulting in microstructural differences due to process dependent cooling rates. The as-sprayed alloy exhibited fine equiaxed Si particles uniformly distributed throughout the matrix in contrast to the as-cast alloy, which exhibited acicular morphology with relatively large needle-like Si particles. The effect of Si morphology on the microstructural stress distribution of the as-cast and as-sprayed alloys was estimated by simulating uni-axial tensile loads on microstructures using Object Oriented Finite Element code (OOF2). Microstructures of the as-sprayed alloy experienced relatively low and uniform stress distribution, while the microstructural stress distribution in the as-cast alloy was significantly influenced by the orientation of the needle shaped silicon particles. Near-eutectic Al-Si alloy is processed through casting and spray forming. Microstructure of as-cast alloy shows acicular needle-like morphology of silicon particles while spray formed alloy shows uniform distribution of fine and equiaxed silicon particles. Microstructure-based finite element analysis shows strong orientation dependence of Si on the stress distribution in as-cast alloys in contrast to as-sprayed alloys. © 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

About the journal
JournalAdvanced Engineering Materials
ISSN14381656
Open AccessNo
Concepts (19)
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    ACICULAR MORPHOLOGY
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    CONVENTIONAL CASTING
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    MICROSTRUCTURE-BASED FINITE ELEMENT ANALYSIS
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    OBJECT ORIENTED FINITE ELEMENT CODES
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    OBJECT-ORIENTED FINITE ELEMENTS
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    SPRAY-FORMED ALLOY
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    Uniform distribution
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    UNIFORM STRESS DISTRIBUTIONS
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    Aluminum
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    Casting
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    Eutectics
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    Finite element method
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    Morphology
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    Needles
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    Silicon
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    SPRAY STEELMAKING
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    Stress concentration
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    Textures
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    Silicon alloys