THE EFFECT OF HEAT TREATMENT ON MECHANICAL PROPERTIES OF SQUEEZE CASTINGS FROM ALSI7MG ALLOYS

1 KORDAS Paulina
Co-authors:
1 ZYSKA Andrzej
Institution:
1 Częstochowa University of Technology, Częstochowa, Poland, EU, kordas.paulina@wip.pcz.pl
Conference:
26th International Conference on Metallurgy and Materials, Hotel Voronez I, Brno, Czech Republic, EU, May 24th - 26th 2017
Proceedings:
Proceedings 26th International Conference on Metallurgy and Materials
Pages:
1794-1799
ISBN:
978-80-87294-79-6
ISSN:
2694-9296
Published:
9th January 2018
Proceedings of the conference were published in Web of Science and Scopus.
Metrics:
102 views / 97 downloads
Abstract

The characteristics of cast aluminum alloys are shown in the paper with particular emphasis put on AlSi7Mg alloy and method of silumin modification. Heat treatments have been described to enhance the mechanical properties of cast aluminum alloy. The work presents the melting process, modification and casting of the AlSi7Mg alloy by gravity method and squeeze casting. The paper describes the influence of solution heat treatment and ageing treatment to mechanical properties of AK7 silumin. Based on the research, it has been found that squeeze casting ensures the production of high-quality AlSi7Mg casting alloy. Modification with strontium improves the strength properties and significantly increases the elongation of gravity castings - the relative increase of A5 in these castings has reached about 40 %. In all tested castings the treatments of solution heat and ageing have increased the strength of the material by 33-40 MPa. A combination of modification, heat treatment and squeeze casting allows to manufacture of AlSi7Mg alloy with high mechanical properties, Rm = 280 MPa, Rp0.2 = 190 MPa, A5 = 16 %.

Keywords: Squeeze casting, aluminum alloys, 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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