Abstract
The production of the ultrafine-grained brass tubes was carried out by multi-pass parallel tubular channel angular pressing (PTCAP) as a severe plastic deformation process. In addition to that, the microstructural and nano-mechanical features were investigated by EBSD and Nanoindentation for 0, 1, and 3 passes in a comparable 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 of the coarse-grained counterpart after the third pass respectively. The effects of the number of passes on the grain refinement 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 were refined to 780 and 590 nm from its initial size of 75 µm. The fraction of the high-angle grain boundaries was increased from 30% in pass 1 to 66% in pass 3 of the PTCAP process.
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