[PDF] Top 20 Deformation Heterogeneities in Equal Channel Angular Pressing

... case deformation is confined to the shear ...the deformation zone from the shear plane over the fan-shaped ...of equal friction in the channels, the PVZ is symmetrical about the ideal shear plane, but ... See full document

... and (d) provides a clear demonstration of the very marked refinement that may be attained through processing by ECAP through a reasonable number of passes. The misorientation distributions associated with these four maps ... See full document

... ABSTRACT: Equal Channel Angular pressing is a unique Severe Plastic Deformation Process for producing ultra-fine grain sized ...a channel angle of 110 o in a 100 ton hydraulic ... See full document

... properties. Equal channel angular pressing (ECAP), which primarily introduced by Segal is one of the severe plastic deformation methods for developing ultrafine grained materials in ... 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

... Figure 12. Microstructure after heterogeneous deformation by one pass of ECAP of a severely cold worked conventional 6000 series aluminum alloy. Optical micrograph (a) showing a microstructural overview and ... 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

... Mechanical Properties Figure 8 shows the tensile engineering stress-strain curves for as cast composites Al-5% SiC and Al-10% SiC compared to pure aluminum matrix material.. These curves[r] ... See full document

... maximum pressing force is experienced when processing under die C as shown in ...large channel angle of 130⁰, which imposes small stresses in the material such that small equivalent strains are achieved in ... See full document

... plastic deformation imposed by the ECA ...shear deformation direction of the ...shear deformation plane, the thinned and severed morphology might be ... See full document

... and 30 µ m < . The composites were subjected to equal channel angular pressing (ECAP) under various conditions and the microstuctural changes during ECAP were examined. A special focus was ... See full document

... (3) Deformation twins were observed in the matrix, and they were parallel to the primary slip system plane parallel to the macroscopic shear plane of ...that deformation twinning plays an important role as ... See full document

... of deformation processing until a deformation texture is formed, where the location of predominant slip systems along the direction of action of the maximum tangential stresses is ... See full document

... The simplest die, a block with two channels that are connected by a 90° angle, was used to perform ECAP. The pure copper samples were pressed through the die with two circular intersecting channels and equal cross ... 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

... the deformation could also be understood by the contact between the neighboring Al-Al and Al-Sn grain boundaries, during the ECAP process and the subsequent ... 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 stored ... See full document

... plastic deformation in achieving a balance between the required properties, investigations on the mechanical properties, the thermal stability, the corrosion properties and the thermal resistivity were carried ... 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 because ... See full document

... Another combined method which was used to consolidate powders is torsional-equal channel angular pressing (T-ECAP) [185] which is shown in Fig. 6b. Consolidation of pure Al particles showed ... See full document