from the conferences organized by TANGER Ltd.
The main advantage of mechanical alloying (MA) is a possibility to combine together different components that are difficult or even impossible to combine by conventional melting methods due to their high reactivity in liquid or semi-liquid state. In the present work, results of experiments performed on Al-AgO and Al-CeO2 composite rods manufactured by means of mechanical alloying method was presented. Structure of as-extruded composites was analysed using SEM/TEM observations and X-ray diffraction analysis (XRD). It was found that intermetallic phases were formed at elevated temperature as a result of chemical reaction of strengthening particles and aluminium matrix. In order to determine composites thermal stability, samples were subjected to annealing in temperature range 473 K – 873 K. The effect of annealing on the sample microhardness was determined and compared with respect to structural processes resulting from chemical reaction of CeO2 and AgO and aluminium matrix. It was found that adequate intermetallic grains start to form during production process (MA, hot extrusion) and their coarsening was intensified during following annealing at high enough temperature.
Keywords: Powder metallurgy, mechanical alloying, powder’s consolidation, aluminum composite© This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.