Effect of hydrostatic pressure on flow and deformation in highly reinforced particulate composites. (15th September 2016)

• Record Type: Journal Article
• Authors: Tarantino, M.G.; Weber, L.; Mortensen, A.
• Is Part Of: Acta materialia. Volume 117(2016)
• Page Start: 345
• Page End: 355
• Publication Date: 2016-09-15
• Subjects: Particle reinforced composites -- Yield behavior -- Pressure dependent plasticity -- Yield criterion -- Granular material; Materials -- Periodicals; Materials science -- Periodicals; Materials -- Mechanical properties -- Periodicals; Metallurgy -- Periodicals; Chemistry, Inorganic -- Periodicals; 620.112
• DOI: 10.1016/j.actamat.2016.06.052
• Languages: English
• ISSNs: 1359-6454

Abstract

Abstract: Infiltrated particle reinforced composites combine a dense matrix with particles that are in mutual contact and can therefore transfer compressive stress directly from one particle to the next. As a result, these composites may combine characteristics of the plasticity of their matrix with those of granular matter plasticity. We measure here the influence of a 200 MPa superimposed fluid hydrostatic pressure on the flow stress of high volume fraction (56–62 vol pct) particulate Al2 O3 Al composites produced by infiltration and show that the yield response of such composites is indeed pressure-sensitive. A simple analysis that transposes to metal matrix composites the theory of fluid-saturated granular media mechanics explains the phenomenon quantitatively. Graphical abstract: