Study on microwave synthesis and characterisation of bulk nickel aluminides
Authors: Karimbeigi, A; Zakeri, A; Aboutalebi, M R; Sharifi, P
Source: Materials Science and Technology, Volume 28, Number 1, January 2012 , pp. 86-91(6)
Publisher: Maney Publishing
Combustion synthesis of Ni‐Al intermetallic compounds from 1:1 molar mixtures of aluminium and nickel powders subjected to microwave (MV) heating has been investigated. Preliminary experiments confirmed that the usage of silicon carbide susceptor could successfully result in the preparation of bulk products in a fast and reproducible manner. The effect of the degree of compaction of the powder mixture and applied MV power on the ignition time, as well as the composition, microstructure and microhardness of the final products, was examined. Decreasing the compact porosity made the grain size of intermetallic products decrease and the microhardness increase. Variation of MV power at a constant degree of compaction did not affect the product grain size and microhardness. However, it had a distinct influence on the product composition; applying MV power of 1100 W on samples with moderate compactness resulted in NiAl, whereas that of 440 W produced Al3Ni2. Ni3Al precipitates were also identified when both the compaction pressure and the MV power were high. Moreover, a negative linear relationship was found between ignition time and MV power.
Document Type: Original Article
Affiliations: Research Laboratory for Electromagnetic Processing of Materials, School of Metallurgy and Materials Engineering, Iran University of Science and Technology, Tehran, Iran
Publication date: 2012-01-01
Authors wishing to cite fast track papers should give the journal name and the article DOI. This will enable reference linking via CrossRef and allow forward and backward citation tracking systems to associate the fast track citation with the final journal reference.Materials Science and Technology is the successor of two previous titles, for which digitised archives are available: Metal Science (Vols. 1—17; 1967—84) and Metals Technology (Vols. 1—11; 1974—84).
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