Megumi Kawasaki¹, Jae-Kyung Han¹, Terence G. Langdon²; ¹Oregon State University, ²University of Southampton

Processing through the application of high-pressure torsion (HPT) provides significant grain refinement in bulk metals at room temperature. These ultrafine-grained (UFG) materials after HPT generally demonstrate exceptional mechanical properties. Recent reports demonstrated the bulk-state reactions for the synthesis of hybrid alloy systems by utilizing conventional HPT processing for direct mechanical bonding of dissimilar bulk metal disks during concurrent grain refinement. Accordingly, the present study shows processing of several UFG Al hybrid alloy systems including Al-Mg and Al-Cu by HPT under 6.0 GPa at room temperature and the experiments were conducted for examining the evolution of microstructure, mechanical properties and additional functionalities including specific strength. This study demonstrates a significant opportunity for making use of HPT for a significant contribution to current developments in diffusion bonding, welding and mechanical joining technologies as well as to introduce hybrid engineering materials.