[PDF] Top 20 Deformation Characteristics Evaluation of Modified Equal Channel Angular Pressing Processes

... ECAP processes in comparison to ECAP ...the processes, the effective strain variations across the width ‘A-B’ of the workpiece cross section are plotted in ... See full document

... Incremental equal channel angular pressing (I-ECAP) is one of the continuous severe plastic deformation (SPD) processes. This paper presents the processing of commercial purity ... See full document

... a pressing load and obtaining more homogeneous deformation in ECAP is to modify a perform shape, which is widely used in conventional metal forming processes, ...the pressing load is less than ... See full document

... plastic deformation (SPD) processes, used to refine grain structure in metals in order to improve their properties, equal channel angular pressing (ECAP) is the most popular one ... See full document

... plastic deformation (SPD) ...SPD processes Equal Channel Angular Pressing (ECAP) up to three passes in three different routes, ... See full document

... plastic deformation results in a very intrinsically instable microstructure and the evolution of the substructures with the subsequent annealing are conducted by thermally activated processes, reducing the ... See full document

... different processes such as rolling, forging, upsetting and extrusion can be ...plastic deformation which is more critical for “hard to deform” materials like Mg and Ti ...plastic deformation in ... 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

... during equal channel angular pressing (ECAP) was studied in an as- cast ...0.16%Zr modified 7475 aluminium alloy at a temperature of 673 ...of deformation bands due to large ... See full document

... forming processes is characterized by a complex deformation history, which is composed of successive strain paths that may vary considerably in their ...the equal-channel angular ... 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

... flow characteristics with BP is demonstrated in ...Quantitative evaluation of the flow pattern was made possible from the deformed grid scribed on split extra samples of shorter ...upper channel corner ... See full document

... by equal-channel angular pressing (ECAP) to a total of 8 passes at 473 K and the pressed samples were examined using transmission electron microscopy, differential scanning calorimetry and ... See full document

... an angular channel at 110 o ...for channel angle Ф=90º, but the strain in-homogeneity is also ...for channel angles, Ф=110º, 115º, 120º. Hence the channel angle of Ф=110º is chosen for ... See full document

... where a sample is pressed through a channel having an equal cross-section but bent into an L-shaped configuration in a die. 6) A large shear strain is introduced in the sample when the material passes ... See full document

... The microhardness of the ECAP processed pure magne- sium is summarized in Table 1. The hardness increased after ECAP by 9–21%, depending on the processing temperature. This increase in hardness after ECAP is attributed ... See full document

... TEM microstructure of the alloy matrix after 2-passes ECAP at 373 K is presented in Fig. 3. The microstructure mainly consisted of parallel bands of elongated grains hav- ing the width of ∼ 0 . 3 µm and the length of ∼ 0 ... See full document

... Figure 10. Generalized diagram with uniaxial flow curves as functions of the effective plastic strain depicting the regions where localized deformation occurs for a) isotropic and b) kinematic hardening. Material ... See full document

... semicircular) channel types were investigated in tubular channel angular pressing (TCAP) suitable for deforming cylindrical tubes to large strains without changing the tube ...the ... See full document

... stress of copper reached their maximum approximately 75 HB and 390 MPa after five passes and decreased from the fifth to the eighth pass. Thus, the relevant mechanical properties can be achieved using ECAP only up to ... See full document