Investigation of Interfacial Reaction Products and Stress Distribution in Selective Laser Melted Al12Si/SiC Composite Using Confocal Raman Microscopy

Xiaopeng Li, C. Kong, Thomas Becker, Tim Sercombe

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27 Citations (Scopus)
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Abstract

© 2016 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim

The interfacial reaction products and stress distribution in a selective laser melted Al12Si/SiC composite are studied using confocal Raman microscopy. Results reveal that needle-like Al4C3 and equiaxed Si are located at the interface between the Al matrix and SiC particles. This reaction is triggered by the high temperature within the SiC due to its high laser absorptivity. Raman frequency shifts to lower wavenumber are observed in both the SiC and Si, suggesting the existence of tensile stress within the interface. The tensile stress in SiC is higher in the build direction than in the direction perpendicular to the build direction. No such difference is observed in the Si. The reason is ascribed to the Gaussian distribution of the laser energy density and stress relief through the interfacial reaction.

Original languageEnglish
Pages (from-to)1337-1341
Number of pages5
JournalAdvanced Engineering Materials
Volume18
Issue number8
Early online date3 Jun 2016
DOIs
Publication statusPublished - 1 Aug 2016

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