Densification mechanism and microstructural evolution in selective laser sintering of Al-12Si powders

Journal article

Authors / Editors

Olakanmi, Eyitayo

Research Areas

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Publication Details

Author list: Olakanmi EO, Cochrane RF, Dalgarno KW

Publisher: Elsevier

Place: LAUSANNE

Publication year: 2011

Journal: Journal of Materials Processing Technology (0924-0136)

Journal acronym: J MATER PROCESS TECH

Volume number: 211

Issue number: 1

Start page: 113

End page: 121

Number of pages: 9

ISSN: 0924-0136

eISSN: 1873-4774

Languages: English-Great Britain (EN-GB)

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Abstract

The role of processing parameters on the densification mechanism and microstructural evolution in laser sintered Al-12Si powder has been explored. It was established that both the densification mechanism and microstructural evolution in laser sintered Al-12Si powder were controlled by the specific laser energy input. Analysis of the cross-section of laser sintered microstructures of Al-12Si powders indicated that the tops of the grains in the previous layer are partially re-melted and then undergo epitaxial growth in the next layer where the heat affected zones (HAZ) grain boundaries and solidification grain boundaries (SGBs) are continuous along the fusion boundary. (C) 2010 Elsevier B.V. All rights reserved.

Keywords

Aluminium silicon alloys, Epitaxial growth, Microstructural evolution, Rapid solidification, Selective laser sintering, Spheroidisation

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