STRUCTURAL CHARACTERISTICS OF NI-AL-MO BASED ALLOYS

1 MALCHARCZIKOVÁ Jitka
Co-authors:
1 KURSA Miroslav 1 POHLUDKA Martin 1 KOHUT Pavel
Institution:
1 VSB - Technical University of Ostrava, Faculty of Metallurgy and Materials Engineering, Department of Non-ferrous Metals, Refining and Materials Recycling, RMSTC, Ostrava, Czech Republic, EU, jitka.malcharczikova@vsb.cz, miroslav.kursa@vsb.cz, martin.pohludka@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:
1576-1581
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:
49 views / 9 downloads
Abstract

The paper deals with the characterization of the structure and phase composition of selected types of nickel alloys. Castings were prepared by vacuum induction melting and centrifugal casting. Samples of Ni-Al-Mo based alloys with various contents of molybdenum were directionally solidified by Bridgman method in corundum tubes with specified apex angle. Rate of solidification was 50 and 20 mm/h. The samples were used for structural analysis in longitudinal and transverse direction. The structure is significantly influenced by the process of directional solidification. Microstructural characterization of materials was performed with use of scanning electron microscope. Distribution of individual elements in phases was captured on linear analysis. These alloys do not exhibit significant chemical heterogeneity. The samples are composed of a phases Ni3Al and (Ni) with various contents of molybdenum. The existence of a separate phase (Mo) was not confirmed. Determined values of microhardness show the dependence on molybdenum content and rate of directional solidification.

Keywords: Ni-Al based alloys, molybdenum, directional solidification, Bridgman method, microstructure

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