| Grain refinement and formation of ultrafine grained structure in a metallic glass reinforced aluminum matrix composite through equal channel angular pressing (ECAP) |
| Paper ID : 1108-UFGNSM-FULL |
| Authors: |
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Mohammadreza Rezaei *1, Seyyed Hossein Razavi2, Saeed Shabestari3 1Semnan-Damghan-Damghan university 2Center of Excellence for High Strength Alloys Technology (CEHSAT), School of Metallurgy and Materials Engineering, Iran University of Science and Technology (IUST) 3Center of Excellence for High Strength Alloys Technology (CEHSAT), School of Metallurgy and Materials Engineering, Iran University of Science and Technology (IUST), 16846-13114, Narmak, Tehran, Iran |
| Abstract: |
| Equal channel angular pressing (ECAP) process as a famous severe plastic deformation process was employed to produce the ultrafine grained matrix composite reinforced with Al-Cu-Ti metallic glass particles by consolidating the powders of pure Al and metallic glasses. The grain refinement process of metallic glass reinforced composite as well as the pure Al produced by the same method was investigated by precise studying the microstructural features of composite during increasing the ECAP pass numbers. Microstructure was studied through optical microscopy (OM) and transmission electron microscopy (TEM). The dislocation density changes during severe plastic deformation were calculated using the Williamson-Hal method from X-ray patterns of produced samples. It was found that the grain size of both composite and pure Al were decreased gradually with increasing the ECAP pass numbers and well developed high angle grain boundaries were successfully created in the microstructure in high ECAP passes. Also, the stored dislocations density showed different trends in both composite and pure Al. Based on these results the mechanism of grain refinement and the formation of high angle boundaries have been discussed. According to OM observations, increasing the ECAP pass numbers significantly influenced the porosity content and distribution of reinforcing particles in the matrix of the composite. |
| Keywords: |
| Equal channel angular pressing (ECAP), ultrafine grained matrix composite, metallic glass particles, grain refinement process |
| Status : Paper Accepted (Oral Presentation) |
