Metallographic Characterization of Porosity in A Cast Aluminum Alloy A356-T6
Microporosity in both HIPped and non-HIPped unmodified aluminum cast alloy A356-T6 was quantified metallographically in terms of its area, area percentage, length, sphericity and perimeter. In the studied materials, the secondary dendrite arm spacing (SDAS) values vary from 82μm to 96μm for both the HIPped and the non-HIPped castings. HIPping process significantly reduces porosity area fraction and pore sizes. The maximum area fraction of porosity and maximum pore area of the non-HIPped specimens are increased with increasing SDAS.
Yafang Han et al.
G. Ran and J. E. Zhou, "Metallographic Characterization of Porosity in A Cast Aluminum Alloy A356-T6", Materials Science Forum, Vols. 546-549, pp. 989-994, 2007