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This article begins with a general review of the effects of changes in stress state on processing of materials. It describes the fundamentals of hydrostatic extrusion and reviews the various issues and benefits associated with hydrostatic extrusion. The article discusses the hydrostatic extrusion of structural alloys, composites, brittle materials, and intermetallics or intermetallic compounds, with examples. It concludes with a discussion on the attempts made to extend the hydrostatic extrusion to higher temperatures.

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SiC 20 Aerospace Metal Composite Limited Hot isostatic pressing 2124 SiC 26 Not reported Squeeze casting 6061 SiC 20 Duralcan Aluminum Composites Corp Cast þ extruded 2014 Al 2 O 3 15 Not reported Cast þ forged A1-5%Si-0.2%Mg SiC p 9-22 (a) SiCw, whisker reinforcement; SiCp, particulate reinforcement. Source: Ref 4-18