Abstract
The effect of hard particles in compacted powders is studied under highly deviatoric stress states. The soft matrix powder is pure aluminum while the hard particles are W 2 C particles. The behavior of compacts with volume fractions of hard particles up to 60% is investigated. Diametral compression and simple compression tests are carried out both at room temperature and at 450 ∘ C . The diametral compression test allows to submit the compact to a stress state with substantial tensile components. The dilatant behavior of composite compacts has been studied under simple compression conditions at room temperature. Different volume fractions of hard particles and porosity content are investigated for both test conditions. It is shown that the macroscopic effect of the hard particles is a decreasing function of the stress triaxiality.
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