ABSTRACT
A laminate structure with a nanostructured Cu-10Zn layer sandwiched between two coarse-grained Cu layers was produced by high-pressure torsion, rolling and annealing. Gradient structures (GS) with a grain-size gradient have been recently introduced to structural materials to optimize their mechanical properties with low cost. The fabrication of laminated nanostructured (NS)/coarsegrained (CG) structures with sharp boundaries is also a challenge since interfacial strength and selective grain refinement are required simultaneously. The Scanning electron microscopy examination revealed that the boundary only failed near the fracture surface, which indicates the boundary did not fail during the tensile tests before the final fracture process. High pressure torsion followed by rolling and annealing was used to produce laminated materials by sandwiching a NS layer between CG layers. Uniaxial tensile test is performed and reveals an extra strain hardening that lead to larger uniform elongation than what is predicted by conventional rule of mixture.
