[PDF] Top 20 Cyclic Deformation Behavior of Ultra Fine Grained Copper Produced by Equal Channel Angular Pressing

... of ultra-fine grained (UFG) materials produced by severe plastic deformation (SPD) techniques such as equal channel angular pressing (ECAP), 1–4) accu- mulative ... See full document

... of copper, particularly for use in connectors, without a detrimental effect on its overall properties ...of copper leads to a significant increase in strength, but often the price is an appreciable loss of ... See full document

... the fine-grained ECAPed material deviated from linearity toward a typical sigmoidal shape having three distinct regions: І, ІІ and ІІІ ...superplastic behavior of different materials by measuring the ... See full document

... self-organized deformation patterns has been observed on meso- and macro-scopic scale, including: (i) regular network of surface cracks (10– 20 mm scale), (ii) quasi-periodic arrangement of longi- tudinal ... See full document

... Thus, cyclic softening should be dependent on the size, amount and distribution of precipitates. In line with these trivial expectations, Fig. 6 shows that the rate of softening differs for materials with different ... See full document

... Equal channel angle pressing (ECAP) is a processing procedure whereby an intense plastic strain is imposed by pressing a sample in a special die ...producing ultra-fine ... See full document

... plastic deformation (SPD) processing that enables increasing significantly the contribution of grain-boundary strengthening, and also involves a combination of other strengthening factors (work hardening, twins, ... See full document

... pure copper of 280 nm grain size was prepared by equal-channel angular ...of deformation increased linearly with the increase in ... See full document

... the deformation zone, as described below. Since shear plastic deformation is only applied in the narrow region of the L-shaped corner, the material remains under static annealing conditions inside the ... See full document

... indentation behavior using 2 mm diameter hemispherical ball ...plastic deformation proc- essing are of importance in engineering processing design and ...plastic deformation and heat transfer ... See full document

... Increased yield strength and hardness can be justified by strain hardening at initial stages. Specifically from the first pass to the fourth passes, the strain hardening plays a pivotal role in yield strength, increasing ... See full document

... plastic deformation (SPD) methods such as high-pressure torsion (HPT), accumulative roll bonding (ARB), equal-channel angular pressing (ECAP), multiple forging (MF), twist extrusion ... See full document

... significant fraction (nearly 60 to 70 pct) at approximately 200 nm, designated the ultrafine-grained phase (UFG). Furthermore, depending on the amount of unmilled Al added during blending, the remaining grain-size ... See full document

... during deformation and resulting spatial distribu- tion of recrystallisation; 2) The work hardened state, name- ly dislocation density and structures; and 3) the introduc- tion of localised shear bands, which ... See full document

... These specimens were cut by an electric-spark discharge facility so that (111) became parallel to the shear plane and ½112 2 was parallel to the shear direction. Throughout this paper, crystallographic orientations are ... See full document

... horizontal channel 18.9 mm wide. The horizontal channel becomes wider towards the exit of the die to reduce friction between billet and ...horizontal channel depends on the bottom position of the ... See full document

... triangular channel, while it is nonsymmetric in semicircular channel as found in the conventional ...and channel angles. The head shape in the semicircular channel, which is similar to route A ... See full document

... incremental equal channel angular pressing ...and fine-grained, hot-rolled ...reported. Fine- grained samples were successfully processed at 200 °C, while ... See full document

... plastic deformation down to room temperature leaving grain boundaries in the nonequilibrium ...plastic deformation was obtained in copper bicrystals subjected to equal-channel ... See full document

... to pressing with 50% thickness reduction, rods subjected to ECAP, disc and ring samples subjected to HPT and disc samples subjected to post-HPT annealing were evaluated in terms of Vickers microhardness, ... See full document