Abstract
This paper is a follow-up work reported in reference (L. Cao et al., Mater. Sci. Eng. A. 742 (2019) 305–308.). In the current work, we focused on the effect of the oxidation of Al powder particles on the anisotropy in tensile mechanical properties of bulk Al samples fabricated by spark plasma sintering (SPS). The tensile loading directions were respectively aligned with the transverse and longitudinal directions of materials. The results demonstrate that the oxidation of Al powder particles increases the anisotropy factor (defined as the ratio of the measured mechanical property value in the transverse direction to that in the longitudinal direction) from 1.18 to 2.76 of the elongation to fracture of bulk Al samples. Based on the analysis of the results, it is proposed that if the dominating cracks can initiate and propagate along interparticle boundaries during tensile deformation of a bulk metallic sample fabricated by thermomechanical powder consolidation, the shape of powder particles in the sample would play a major role in controlling its tensile ductility.
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