Severe plastic deformation of commercially pure aluminum using novel equal channel angular expansion extrusion with spherical cavity
Autor: | Xiang Zhang, Jun-chi Yuan, Wei Song, Xin-yu Jing, Xiao-xi Wang |
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Rok vydání: | 2020 |
Předmět: |
010302 applied physics
Equiaxed crystals Materials science Equal channel angular extrusion Metals and Alloys 02 engineering and technology Plasticity 021001 nanoscience & nanotechnology Geotechnical Engineering and Engineering Geology Condensed Matter Physics Microstructure 01 natural sciences Indentation hardness 0103 physical sciences Materials Chemistry Extrusion Severe plastic deformation Composite material Hydrostatic stress 0210 nano-technology |
Zdroj: | Transactions of Nonferrous Metals Society of China. 30:2613-2624 |
ISSN: | 1003-6326 |
DOI: | 10.1016/s1003-6326(20)65406-1 |
Popis: | Equal channel angular expansion extrusion with spherical cavity (ECAEE-SC) was introduced as a novel severe plastic deformation (SPD) technique, which is capable of imposing large plastic strain and intrinsic back-pressure on the processed billet. The plastic deformation behaviors of commercially pure aluminum during ECAEE-SC process were investigated using finite element analysis DEFORM-3D simulation software. The material flow, the load history, the distribution of effective strain and mean stress in the billet were analyzed in comparison with conventional equal channel angular extrusion (ECAE) process. In addition, single-pass ECAEE-SC was experimentally conducted on commercially pure aluminum at room temperature for validation, and the evolution of microstructure and microhardness of as-processed material was discussed. It was shown that during the process, the material is in the ideal hydrostatic stress state and the load requirement for ECAEE-SC is much more than that for ECAE. After a single-pass ECAEE-SC, an average strain of 3.51 was accumulated in the billet with homogeneous distribution. Moreover, the microstructure was significantly refined and composed of equiaxed ultrafine grains with sub-micron size. Considerable improvement in the average microhardness of aluminum was also found, which was homogenized and increased from HV 36.61 to HV 70.20, denoting 91.75% improvement compared with that of the as-cast billet. |
Databáze: | OpenAIRE |
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