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MECHANICAL AND ELECTRICAL PROPERTIES OF CAST AL–ER–ZR ALLOY

1 LEIBNER Michal
Co-authors:
1 VLACH Martin 1 KODETOVÁ Veronika 1 VESELÝ Jozef 1 KUDRNOVÁ Hana 1 CIESLAR Miroslav 1 ZIKMUND Sebastien 2 OČENÁŠEK Vladivoj 1,3 LUKÁČ František 4 MÁRA Vladimír
Institutions:
1 Charles University, Faculty of Mathematics and Physics, Prague, Czech Republic, EU, mleibner@seznam.cz
2 SVÚM a.s., Čelákovice, Czech Republic, EU
3 Academy of Sciences of the Czech Republic, Institute of Plasma Physics, Prague, Czech Republic, EU
4 Czech Technical University in Prague, Faculty of Mechanical Engineering, Prague, Czech Republic, EU
Conference:
30th Anniversary International Conference on Metallurgy and Materials, Brno, Czech Republic, EU, May 26 - 28, 2021
Proceedings:
Proceedings 30th Anniversary International Conference on Metallurgy and Materials
Pages:
1095-1100
ISBN:
978-80-87294-99-4
ISSN:
2694-9296
DOI:
https://doi.org/10.37904/metal.2021.4222
Published:
15th September 2021
Proceedings of the conference have already been published in Scopus and we are waiting for evaluation and potential indexing in Web of Science.
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Abstract

Mechanical and electrical properties of an Al–Er–Zr alloy were investigated. Microhardness and resistometry measurements were supplemented by transmission electron microscopy and scanning electron microscopy. Resistivity decreases during isochronal annealing take place within the following temperature intervals: 150–270 °C, 300–420 °C and 450–570 °C. The isochronal microhardness curve reflects hardening effects at corresponding temperatures. However, no thermal effect was observed in the DSC curves ranging from 25 °C to 600 °C. A transmission electron microscopy observation of the alloy studied isochronally annealed up to 390° C revealed a high density of L12-structured particles, some of which had nucleated on dislocations. The distinct electrical resistivity, as well as microhardness, changes are in all cases connected with the precipitation and evolution of the Al3Er, Al3Zr and/or Al3(Er,Zr) particles.

Keywords: Precipitation hardening, Al–Er–Zr alloy, resistivity, TEM

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