Investigation of constrained groove pressing on the Copper sheets

In the last decade, the importance of severe plastic deformation techniques is extensively recognized for all researchers in the materials science field. In this research, one of the severe plastic deformation (SPD) methods known as constrained groove pressing (CGP) has been studied. This method is using to create sheets with ultrafine grain structure. Effects of CGP process have been investigated on mechanical properties and microstructure of Copper sheets. Tensile test, Vickers micro hardness and optical microscopy were used to examine mechanical and microstructure properties. The results show, by the CGP process, strength and hardness increase, significantly. After the first pass, the yield and tensile strength increased %57 and %82, respectively. Hardness results illustrated by increasing CGP passes, uniformity of strain increased. The obtained images from optical microscopy demonstrated that the CGP process is very effective for achieving to ultrafine grain structures. Also, the inhomogeneity factor (I. F) was studied to investigate the homogeneity of the hardness.