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Direct laser sintering of aluminum matrix composites

Simchi, A ; Sharif University of Technology

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  1. Type of Document: Article
  2. Abstract:
  3. In the present work, we used direct metal laser sintering (DMLS) process to fabricate Al-SiC composite parts directly from a three-dimensional CAD model. Al-7Si-0.3Mg powders were blended with various amounts of SiC particles (5, 10, 15, 20 vol%) at two different sizes (7 and 17 μm) and subjected to direct laser sintering using a 200 W continuous wave CO2 laser beam at various scan rates. The densification and microstructural features of the laser-sintered parts were studied. It is shown that the highest density is obtained for the Al alloy-5% SiC (7 μm) composite powder. The melt stability is also found to be improved in the presence of SiC particles. The microstructure of the laser-sintered parts composed of α-Al, primarily silicon, SiC, and Al4SiC4 three dimensional plates. This paper presents the advantages and barriers of using DMLS for the fabrication of complex-shaped parts from Al matrix composite powders
  4. Keywords:
  5. Al/SiC ; Metal matrix composites ; Aluminum ; Carbon dioxide lasers ; Computer aided design ; Densification ; Laser heating ; Metallic matrix composites ; Microstructural evolution ; Microstructure ; Powder metallurgy ; Powders ; Silicon carbide ; Al matrix composites ; Al-SiC composites ; Aluminum matrix composites ; Direct laser sintering ; Direct metal laser sintering ; Laser sintering ; Microstructural features ; Three-dimensional CAD models ; Aluminum alloys
  6. Source: Proceedings of the World Powder Metallurgy Congress and Exhibition, World PM 2010, 10 October 2010 through 14 October 2010 ; Volume 2 , 2010 ; 9781899072194 (ISBN)
  7. URL: http://publica.fraunhofer.de/starweb/pub09/servlet.starweb