naa a22 4500 510790992 CHVBK 20180411083319.0 cr unu---uuuuu 180411e20130601xx s 000 0 eng 10.1007/s12289-011-1086-z doi (NATIONALLICENCE)springer-10.1007/s12289-011-1086-z On the die design for Repetitive Upsetting - Extrusion (RUE) process [Elektronische Daten] [I. Balasundar, T. Raghu] Though the capability of Repetitive Upsetting- Extrusion (RUE) process to produce ultrafine grains in a bulk aluminium alloy has been established, a detailed description on the material flow, deformation homogeneity and the die design requirements to process bulk materials has never been addressed. To address these issues commercial pure copper (CP Cu) was subjected up to four cycles of RUE using the die design that has been used by various researchers. The RUE processed CP Cu samples when subjected to macrostructure and microstructure evaluation revealed that apart from inhomogeneous deformation, defects such as axial hole/funnel and folds/laps were induced in the processed samples. The formation of these defects during RUE is attributed to the current die design. Based on a recent study carried out on the extrusion defect - axial hole/funnel, a modified RUE die design has been proposed. CP Cu subjected to RUE using the modified die design revealed that the modified die design not only helps in avoiding the defects but also improves the homogeneity. Springer-Verlag France, 2011 Upsetting nationallicence Extrusion nationallicence SPD nationallicence RUE nationallicence Copper nationallicence Balasundar I. Near Net Shape Group, Aeronautical Materials Division, Defence Metallurgical Research Laboratory, 500 058, Hyderabad, India aut Raghu T. Near Net Shape Group, Aeronautical Materials Division, Defence Metallurgical Research Laboratory, 500 058, Hyderabad, India aut International Journal of Material Forming Springer-Verlag 6/2(2013-06-01), 289-301 1960-6206 6:2<289 2013 6 12289 https://doi.org/10.1007/s12289-011-1086-z text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s12289-011-1086-z text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Balasundar I. Near Net Shape Group, Aeronautical Materials Division, Defence Metallurgical Research Laboratory, 500 058, Hyderabad, India aut NATIONALLICENCE 700 1- Raghu T. Near Net Shape Group, Aeronautical Materials Division, Defence Metallurgical Research Laboratory, 500 058, Hyderabad, India aut NATIONALLICENCE 773 0- International Journal of Material Forming Springer-Verlag 6/2(2013-06-01), 289-301 1960-6206 6:2<289 2013 6 12289 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer