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Mohsen Mesbah,Firouz Fadaeifard3,Atefeh Karimzadeh,Bahman Nasiri-Tabrizi,Alireza Rafieerad,Ghader Faraji,A. R. Bushroa 대한금속·재료학회 2016 METALS AND MATERIALS International Vol.22 No.6
The production of the ultrafine-grained brass tubes was carried out by multi-pass parallel tubular channelangular pressing (PTCAP) as a severe plastic deformation process. In addition to that, the microstructuraland nano-mechanical features were investigated by EBSD and Nanoindentation for 0, 1, and 3 passes in acomparable mode. The elastic-plastic and micro scratch behavior were analyzed to show the enhanced features. Based on the obtained results, Young’s modulus and hardness of the specimens shifted to 1.62 and 1.7 times ofthe coarse-grained counterpart after the third pass respectively. The effects of the number of passes on the grainrefinement were also investigated to detect the applied changes through each step of the PTCAP experimental procedures. Moreover, based on the obtained results from EBSD, the grain size of 1 and 3 pass samples wererefined to 780 and 590 nm from its initial size of 75 μm. The fraction of the high-angle grain boundarieswas increased from 30% in pass 1 to 66% in pass 3 of the PTCAP process.