EFFECT OF SINTERING CONDITIONS ON STRUCTURAL PHASES AND FORMABILITY OF AL-CU POWDER MIXTURE

1,2 KUNČICKÁ Lenka
Co-authors:
2 KOCICH Radim 2 JUŘICA Jan 2 KURSA Miroslav 3 ŠOFÉR Michal
Institutions:
1 Faculty of Metallurgy and Materials Engineering, VŠB – Technical University of Ostrava, Ostrava, Czech Republic, EU
2 Regional Materials Science and Technology Centre, VŠB – Technical University of Ostrava, Ostrava, Czech Republic, EU
3 Faculty of Mechanical Engineering, VŠB – Technical University of Ostrava, Ostrava, Czech Republic, EU
Conference:
25th Anniversary International Conference on Metallurgy and Materials, Hotel Voronez I, Brno, Czech Republic, EU, May 25th - 27th 2016
Proceedings:
Proceedings 25th Anniversary International Conference on Metallurgy and Materials
Pages:
1228-1233
ISBN:
978-80-87294-67-3
ISSN:
2694-9296
Published:
14th December 2016
Proceedings of the conference were published in Web of Science and Scopus.
Metrics:
96 views / 22 downloads
Abstract

This experiment deals with preparation of Al plus 25 weight % Cu powder mixture. The powders were mixed, compressed using a double-step cold isostatic pressing (CIP) procedure and subsequently sintered in vacuum either at 500 °C or at 550 °C for 60 min. Analyses of chemical compositions of the pre-sintered samples performed using scanning electron microscopy showed a distinctive difference in structural phases compositions in the two samples featuring a presence of aluminum oxides (Al2O3) and brittle intermetallic phases (CuAl2) in the two samples, respectively. The presence of both was also confirmed by microhardness measurements. The effects of the individual structural phases on formability of the two pre-sintered samples were evaluated with severe plastic deformation via high pressure torsion (HPT). While the sample featuring alumina exhibited sufficient formability at room temperature, the other sample featuring intermetallics was formable only at an elevated temperature.

Keywords: Powders, intermetallics, alumina, cold isostatic pressing, high pressure torsion

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