On-line version ISSN 1980-5373
MUGICA, Gustavo Waldemar; TOVIO, Daniel Oscar; CUYAS, Julio César and GONZALEZ, Aulio César. Effect of porosity on the tensile properties of low ductility aluminum alloys. Mat. Res. [online]. 2004, vol.7, n.2, pp. 221-229. ISSN 1980-5373. http://dx.doi.org/10.1590/S1516-14392004000200002.
The literature contains reports of several studies correlating the porosity and mechanical properties of aluminum alloys. Most of these studies determine this correlation based on the parameter of global volumetric porosity. These reports, however, fail to separate the effects of microstructural features and porosity on alloys, though recognizing the influence of the latter on their mechanical properties. Thus, when the decrease in tensile strength due to the porosity effect is taken into account, the findings are highly contradictory. An analysis was made of the correlation between mechanical properties and global volumetric porosity and volumetric porosity in the fracture, as well as of the b-Al5FeSi phase present in 380 aluminum alloy. Our findings indicate that mechanical properties in tension relating to global volumetric porosity lead to overestimations of the porosity effect in detriment to the mechanical properties. Moreover, the proposed models that take into account the effects of particles, both Si and b-Al5FeSi, are unapplicable to low ductility alloys.
Keywords : aluminum; foundry; porosity; mechanical properties.