THE INVESTIGATION OF AN AL-ZR-TI ALLOY PREPARED BY SPARK PLASMA SINTERING OF ATOMIZED POWDER

1 MOLNÁROVÁ Orsolya
Co-authors:
1 MÁLEK Přemysl 2 LUKÁČ František 2 CHRÁSKA Tomáš 2 CINERT Jakub
Institutions:
1 Charles University in Prague, Czech Republic, EU, *mopersze@gmail.com
2 Institute of Plasma Physics of the CAS, Prague, Czech Republic, EU
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:
1606-1612
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:
14 views / 3 downloads
Abstract

The microstructure and mechanical properties of a powder metallurgical Al-Zr-Ti alloy was studied. Fine powder with a typical size below 50 m was prepared by gas atomization. The smallest powder particles with a diameter below 10 m exhibited a segregation free microstructure. Larger droplets were found to contain intermetallic particles rich in Zr and Ti. The gas atomized powder was consolidated by spark plasma sintering (SPS) at various temperatures ranging from 450 to 550 °C. During SPS the materials microstructure remained nearly unchanged and a fine grain size between 2 and 3 m was observed. All SPS samples exhibited a microhardness of around 90 HV. The annealing (1 h, 500 °C) of the sample sintered at the highest temperature (550 °C) resulted in a decrease of microhardness to 75 HV as a result of changes in the phase composition, the fine grain size was retained. Natural aging at room temperature was not observed.

Keywords: Gas atomization, spark plasma sintering, high strength alloy, thermal stability
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