Investigation of Interfacial Reaction Products and Stress Distribution in Selective Laser Melted Al12Si/SiC Composite Using Confocal Raman Microscopy1 . Issue 8 (3rd June 2016)

• Record Type: Journal Article
• Authors: Li, Xiaopeng; Kong, Charlie; Becker, Thomas; Sercombe, Tim
• Is Part Of: Advanced engineering materials. Volume 18:Issue 8(2016:Aug.)
• Page Start: 1337
• Page End: 1341
• Publication Date: 2016-06-03
• Subjects: Materials -- Periodicals; 620.11
• DOI: 10.1002/adem.201600150
• Languages: English
• ISSNs: 1438-1656

Abstract

Abstract : 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 Al4 C3 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. Abstract : The interfacial reaction products and stress distribution in a selective laser melted Al12Si/SiC composite are studied using confocal Raman microscopy . The results show that the Gaussian distribution of the laser energy density and the interfacial reaction play an important role in determining the stresses within the composite fabricated using selective laser melting.