THE AGEING EFFECT ON Β PHASE PRECIPITATION IN AL-12 WT.% MG ALLOY

1 AMRANE Chahira
Co-authors:
2 HAMANA Djamel 3 RUBIN Anne 3 GAUTHIER Christian
Institutions:
1 Research Unit of Materials Sciences and Applications, University of Constantine1, Algeria, *chahira.amrane@gmail.com
2 National Polytechnic School, Constantine, Algeria
3 Institut Charles Sadron CNRS UPR22-University of Strasbourg, French
Conference:
24th International Conference on Metallurgy and Materials, Hotel Voronez I, Brno, Czech Republic, EU, June 3rd - 5th 2015
Proceedings:
Proceedings 24th International Conference on Metallurgy and Materials
Pages:
1371-1375
ISBN:
978-80-87294-58-1
ISSN:
2694-9296
Published:
12th January 2015
Proceedings of the conference were published in Web of Science and Scopus.
Metrics:
273 views / 127 downloads
Abstract

The Al-Mg 5xxx series aluminum alloy are widely used in industry especially for marine applications since they possess an excellent balance among material such as general corrosion resistance, strength, weldability, weight compared to other Al alloys and formability. These properties are related to the magnesium content and to the applied heat treatments. They undergo the transition phases by precipitation which improves their mechanical properties. These improvements can be obtained by solution heat treatments and suitable ageing ones. Although they are already well studied, the questions concerning the stability of the microstructure and the effect of the various heat treatments are always asked. In this work, we present a study on the evolution of the precipitation reactions after quenching, exactly the evolution of the equilibrium phase (formation, coalescence, and dissolution), in Al-12 wt.% Mg alloy aged at 250°C during different ageing times. The use of various experimental techniques as differential dilatometry, differential scanning calorimetry, scanning electron microscopy and X-ray diffraction, shows their importance and their complementarity in the study of ageing process in this alloy. The obtained results clarified the parameters that govern the stage of β particles appearance and the mechanical responses to the applied heat treatments. These results advance the understanding of β phase evolution aiding future corrosion prevention.

Keywords: Al-Mg 5xxx series aluminum alloys, β phase, ageing, precipitation, mechanical properties

© 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.

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