EXAMINATION OF ALUMINUM MATRIX COMPOSITES OBTAINED BY POWDER METALURGY AND STRENGHTENED BY AGO AND CEO2 PARTICLES

1 SKRZEKUT Tomasz
Co-authors:
1 BLAZ Ludwik
Institution:
1 AGH – University of Science and Technology, Faculty of Non-Ferrous Metals, Cracow, Poland, EU, skrzekut@agh.edu.pl, blaz@agh.edu.pl
Conference:
27th International Conference on Metallurgy and Materials, Hotel Voronez I, Brno, Czech Republic, EU, May 23rd - 25th 2018
Proceedings:
Proceedings 27th International Conference on Metallurgy and Materials
Pages:
1722-1728
ISBN:
978-80-87294-84-0
ISSN:
2694-9296
Published:
24th October 2018
Proceedings of the conference were published in Web of Science and Scopus.
Metrics:
13 views / 2 downloads
Abstract

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
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