On the evolution of flow stress during constrained groove pressing of pure copper sheet

RETRACTED: Nanostructure and mechanical properties of 0–7 strained aluminum by CGP: XRD, TEM and tensile test

“…1 and the details of process procedure can be found in Refs. [19][20][21][22]. However, it should be noted that the width of corrugating dents of grooving dies is equal to the sheet thickness that reveals pure shear deformation condition through the process.…”

“…Previous papers described the advantages of ARB such as its convenience [14][15][16][17] and also its deficiencies such as imperfect bonding between layers of sheet [19] or edge cracking during rolling process [18] which limit ARB application. In 2002, Shin et al [19] invented the other SPD process of sheet; CGP process consists of repetitive shear deformation under plane strain deformation condition by utilizing alternate pressings with grooved and flat dies [19][20][21][22]. Since this method has been recently invented, there are not many works on it and it seems that more work should be carried out to investigate the evolution of material characteristics during the process.…”

“…In the presented study, for the first time a strain magnitude of 6.9 (each CGP pass imposes strain magnitude of 1.15 [21,22]) is imposed to the aluminum sheets to produce a high strength nanostructured sheet. In the following, the characteristics of produced sheets are investigated using XRD, TEM, tensile and hardness tests.…”

On the mechanical properties and microstructure of commercially pure Al fabricated by semi-constrained groove pressing

“…In SCGP, a plate-shaped work-piece is inserted between a pair of the asymmetrically grooved dies and constrained by a channel rather than a container used in the CGP process. This die has been recently utilized for Cu [12,13], Al [14] and brass [15]. However, most of these works are used only to evaluate the flow stress [12,14] and strain distribution [15] during SCGP.…”

“…More recently, other new procedures such as constraint groove rolling (CGR) [7], groove pressing (GP) [8][9][10], modified constraint groove pressing (MCGP) [11] and semi-constraint groove pressing (SCGP) [12][13][14][15] have been also used for promoting CGP die designing. In SCGP, a plate-shaped work-piece is inserted between a pair of the asymmetrically grooved dies and constrained by a channel rather than a container used in the CGP process.…”