Abstract
Particle fracture is an important void nucleation mode in numerous alloys where fracture is governed by void nucleation and growth processes. The rotations of brittle phase inclusions/particles can facilitate particle cracking (and, therefore, void nucleation) by bringing the inclusions/particles in favorable orientations with respect to the applied/induced tensile load, thereby increasing the void nucleation rate. In this contribution, we present detailed quantitative microstructural data on the rotations of Fe-rich inclusions in a 5086 (O) Al-alloy as a function of strain and stress states. These results are compared with our earlier data on particle rotations in 6061 (T6) Al-alloy, and the differences are explained on the basis of differences in the microstructure and constitutive behavior of the two alloys.
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