Abstract:Equal-channel angular pressing (ECAP) is widely recognized as an effective method for processing ultrafine-grained and even nanostructured materials. Important details on processes occurring in the die intersections can be obtained by mapping the microhardness and EBSD microstructures in partiallypressed aluminum and copper through the 90° die of ECAP. Precise measurements were made using grids of partially-pressed Al and Cu and detailed color maps were plotted and compared with EBSD maps. A narrow region alon… Show more
“…The other techniques of the SPD process are pretty challenging to scale up and use in the industry due to high energy and cost, such as the rolling and extrusion processes [5]. Microhardness measurements have been significant in investigating the homogeneity of ECAP processed material on copper [17][18][19][20] and stainless steel [21][22][23][24][25]. The hardness and microstructure homogeneity can be observed and evaluated on the ECAP billet sectioned with imposed strain on the material [20].…”
Hardness and microstructure homogeneity of pure copper and iron-chromium alloy processed by severe plastic deformation (SPD) were investigated in grain refinement. Equal channel angular pressing (ECAP) is one of the well-known techniques of the SPD technique due to their up-scale ability and other methods. SPD was applied to pure copper and iron-chromium alloy at comparable temperatures up to four passes. The microstructure and microhardness were observed and measured in the transverse plane for each billet. The homogeneity observation was carried out from the sub-surface until in the middle of the billet. The result showed that the deformed structure appeared adequately after the first pass and had a higher hardness level. The first pass showed a higher inhomogeneity factor than the fourth pass due to the homogeneity microstructure. The hardness also showed homogeneous value along the transverse plane, and it was concluded that ECAP could achieve complete homogeneity in grain refinement
“…The other techniques of the SPD process are pretty challenging to scale up and use in the industry due to high energy and cost, such as the rolling and extrusion processes [5]. Microhardness measurements have been significant in investigating the homogeneity of ECAP processed material on copper [17][18][19][20] and stainless steel [21][22][23][24][25]. The hardness and microstructure homogeneity can be observed and evaluated on the ECAP billet sectioned with imposed strain on the material [20].…”
Hardness and microstructure homogeneity of pure copper and iron-chromium alloy processed by severe plastic deformation (SPD) were investigated in grain refinement. Equal channel angular pressing (ECAP) is one of the well-known techniques of the SPD technique due to their up-scale ability and other methods. SPD was applied to pure copper and iron-chromium alloy at comparable temperatures up to four passes. The microstructure and microhardness were observed and measured in the transverse plane for each billet. The homogeneity observation was carried out from the sub-surface until in the middle of the billet. The result showed that the deformed structure appeared adequately after the first pass and had a higher hardness level. The first pass showed a higher inhomogeneity factor than the fourth pass due to the homogeneity microstructure. The hardness also showed homogeneous value along the transverse plane, and it was concluded that ECAP could achieve complete homogeneity in grain refinement
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