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This research has been clarified the method to precisely analyze characteristics of micro porosity in AZ91D alloy using X-ray computed tomography(XRCT). For analyzing the micro porosity, we used the defect-free sample that had 50 and 100 μm sized artificial holes. The defining of peak in the variation of gray level could be used for analyzing the porosity or compounds. Increasing of image conversion coefficient a, increased the sensitivity of reconstructed image and showed even the difference of matrix. The optimized slice width for measuring the actual dimensions of micro porosity, depends on the size of micro porosity. If the slice width was too thin to analyze only the porosity, even the matrix would be detected as the porosity and the results would include the serious error. The accuracy of data derived from XRCT depends on the slice width related with the amounts of collected data.

X-ray Computed Tomography for Micro Porosity in AZ91D Alloy