REFINEMENT OF MICROSTRUCTURE OF SEVERAL Γ-TIAL ALLOYS BY MASSIVE TRANSFORMATION AND EFFECT OF REFINEMENT ON COMPRESSION PROPERTIES

1 JUŘICA Jan
Co-authors:
1 SKOTNICOVÁ Kateřina 1 PETLÁK Daniel
Institution:
1 VSB-Technical University of Ostrava, FMMI, RMTVC, Ostrava, Czech Republic, EU, jan.jurica@vsb.cz
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:
1475-1481
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:
309 views / 138 downloads
Abstract

The possibilities of microstructure refinement of several γ-TiAl alloys by the massive transformation and the effect of refinement on compression properties are discussed in this paper. Two alloys were prepared by plasma arc melting using the water-cooled copper crystallizer and two other alloys were prepared by vacuum induction melting. All alloys were subjected to subsequent two-step heat treatment, which consisted of the dissolving annealing followed by the ageing. This procedure resulted in the considerable reduction of the mean grain size from 200-340 µm to 70-35 µm. The microstructure refinement led to the increase of values of the plastic deformation in compression, namely from 917 % to 25-30 %. This effect denotes the substantial decrease of brittleness of these intermetallic alloys as a result of the used heat treatment.

Keywords: γ-TiAl alloys, plasma arc melting, vacuum induction melting, massive transformation, 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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