Effect of strain on mechanical and microstructural properties of Al/Cu claddings during caliber-rolling

Abstract

Al/Cu claddings were fabricated by caliber-rolling process at 298 K and their mechanical and microstructural properties were evaluated. The Vickers hardness (VH) value of the Al layer in the claddings increase with increasing strain, however, it decreased when the strain was over 0.48. For Cu layer, the VH value rose with strain. The grain size of the Al layer in the cladding decreased with increasing strain and then the grain size increased with a strain of over 0.48. In the case of Cu layer, the grain size increased with increasing strain of the cladding. The relationship between hardness and grain size follows the Hall-Petch equation. During, dynamic recovery is pronounced in the Cu layer, however, grain growth only take place in the Al layer. The evolution of texture is due to a difference in stacking fault energy (SFE) between Cu and Al. The Al layer, with a low SFE, exhibits stronger texture than the Cu layer because of different deformation mechanisms.