Principles of severe plastic deformation using tube high-pressure shearing

A new process of severe plastic deformation is described, termed tube high-pressure shearing (t-HPS), in which a tubular sample is subjected to shearing under a hydrostatic pressure. The fundamentals of this process are summarized, the strain relationships are derived and the process is validated using experiments conducted on an aluminum tube. An advantage of this process is that it provides a capability for producing ultrafine-grained materials with a gradient structure.