Abstract
Solid Phase Processing (SPP) involves the application of a high shear strain during metals synthesis or fabrication to produce high-performance microstructures in alloys, semi-finished products and engineered assemblies, without melting the constitutive materials. The family of SPP methodologies includes Friction Stir Welding and Processing, High Pressure Torsion, ECAP, Shear-assisted Extrusion (ShAPE), Friction Extrusion, MELD, Friction Surfacing, and other processing methodologies that induce intense levels of shear into deforming solids. The high levels of shear strain can take a material far from its equilibrium state to persistently metastable microstructures with unprecedented properties. This talk will illustrate some of the microstructures that have developed in different metallic systems processed through high-shear thermomechanical paths, and outline a few of the unique structural and thermophysical properties that have been observed. The talk will conclude with a discussion of emerging applications where SPP processed materials could make a dramatic impact on improved performance and function.
