On the influence of fiber volume fraction and fiber dimensions on creep in short fiber reinforced aluminum alloys

摘要

Creep in short fiber reinforced aluminum alloys is a result of three interconnected elementary microstructural processes: (i) loading of fibres by dislocations, (ii) unloading of fibress by a recovery process in which dislocation loops move to the fibre ends and (iii) fibre breakage. The present work strengthens this view in showing that a model which is based on this microstructural seconario (Dlouhy et al. [1]can successfully predict the creep behavior of MMCs with different fiber volume fractions. The present work also addresses the influcence of the distribution of fibre aspect ratios on the creep process.