Detection of Porosity in Impregnated Die-Cast Aluminum Alloy Piece by Metallography and Computer Tomography

The porosity of die-cast aluminum alloys is a determining factor for the quality product. In this paper, we studied selected part AlSi9Cu3(Fe) compressor by computer tomography and metallography. case part, achievable resolution CT, non-destructive testing method, was 30 μm—this method could not detect smaller cavities. Based on metallographic analysis, percentage defects larger than μm ranges from 10 to 30% total number defects, which represents 75–95% defective area (area ratio). Impregnation with methacrylate resin (used seal cavities prevent leakage) can be detected UV-illuminated optical microscopic examination metallographically prepared specimens. As confirmed scanning electron microscopy, partial filling impregnation occur in system shrinkage