Densification mechanism and microstructural evolution in selective laser sintering of Al-12Si powders |
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| Authors: | EO Olakanmi RF CochraneKW Dalgarno |
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| Affiliation: | a Institute for Materials Research, University of Leeds, UK
b School of Mechanical and Systems Engineering, Newcastle University, UK |
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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. |
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| Keywords: | Aluminium silicon alloys Epitaxial growth Rapid solidification Selective laser sintering Spheroidisation Microstructural evolution |
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