Structural Metallic Materials by Infiltration

Effect of hydrostatic pressure on flow and deformation in highly reinforced particulate composites

“…Composites produced for this study contain indeed negligible levels of initial porosity [29] and therefore are unlikely to show the transition, from a strong dilatant behaviour (often accompanied by barrelling of the tested specimen) to compaction, that is observed with increasing confining pressure in high-porosity rocks and soils (see Refs. [56]- [58] and [60]), or in model cermet composites produced in a parallel study by Pickering et al, who show (see Fig.…”

“…1, were produced by gas-pressure infiltration, where flow of the liquid metal is driven against adverse capillary forces into the open pores of a close-packed ceramic preform using pressurized argon gas (Refs. [9] and [29] describe the process). In order to vary the reinforcement volume fraction in the composite, the preform was packed either (i) to its maximum tapped density or (ii) by cold isostatic pressing (CIP) at 250 MPa.…”

“…, was determined by densitometry prior to testing (before gluing the strain gages) knowing that these composites are pore-free [29].…”