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COMPOZITES AND MULTIPURPOZE COATINGS
ArticleName Centrifugal SHS-metallurgy of nickel aluminide based cast alloys, high-alloyed by boron
ArticleAuthor Sanin V. N., Ikornikov D. M., Yukhvid V. I., Levashov E. A.
ArticleAuthorData

Institute of Structural Macrokinetics and Materials Science of Russian Academy of Sciences, Chernogolovka, Russia:

V. N. Sanin, Leading Researcher, e-mail: svn@ism.ac.ru
D. M. Ikornikov, Research Engineer
V. I. Yukhvid, Head of Laboratory

 

National University of Science and Technology “MISiS”, Moscow, Russia:
E. A. Levashov, Head of a Chair of Powder Metallurgy and Functional Coatings

Abstract

 

Equimolar nickel aluminides (NiAl) have a good balance of chemical and physical properties (low density, high thermal conductivity, high oxidation resistance etc). Therefore, NiAlbased alloys are considered as prospective materials for creation of new high-temperature structural materials for turbine-type power units. Nowadays, NiAl-based materials have low hightemperature strength, and their plasticity with normal temperatures is limited. Improvement of mechanical properties of alloys, based on brittle intermetallide NiAl matrix can be reached by the following operations:
— alloying by plastic refractory metals (Cr, W, Mo, Re etc), forming a quasi-binary eutectics with NiAl;
— creation of composite structures (introduction or in-situ formation of ceramic particles or fibers of Al2O3, SiC, Y2O3, etc).
These approaches can increase a plasticity and high temperature strength of such materials. However, structure and properties of these alloys are very sensitive to composition and obtaining method. At the same time, obtaining technologies often have a laboratory scale. Therefore, the problem of creation of new structural NiAl-based materials is still relevant and has not been solved yet. This work is aimed on the study of possibility of obtaining of cast alloys in Ni – Al – B system with high B-concentration, by means of SHS-metallurgy (in combustion mode). Both researched compounds have a composite structure, where the matrix is formed by NiAl-based solid solution and embedded inclusions of τ-boride Ni20Al3B6 and lamellar precipitates of complex boride (Mo, Cr) B. This work can be regarded as first positive experience of obtaining of composite materials, based on NiAl/τ-borides by means of SHS-metallurgy.

keywords Intermetallic alloys, cast alloys, nickel aluminides, τ-borides, SHS-metallurgy, centrifugal foundry, heat-resistant materials, composite structures
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