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Open AccessArticle

Synthesis of Complex-Alloyed Nickel Aluminides from Oxide Compounds by Aluminothermic Method

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Institute for Materials Technology, Khabarovsk Research Centre at the Far Eastern Branch of the Russian Academy of Sciences, Tihookeanskaya Str. 153, 680042 Khabarovsk, Russia
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Department of Foundry Engineering and Metal Technology, Pacific National University, Tihookeanskaya Str. 136, 680042 Khabarovsk, Russia
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Department of Foundry Technology, National University of Science & Technology MISIS, Leninsky Pr. 4, 119049 Moscow, Russia
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School of Mechanical Engineering and Automation, Wuhan Textile University, 1 FangZhi Road, Wuhan 430073, China
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Department of Functional and Constructional Materials Technology, Vladimir State University Named after Alexander and Nikolay Stoletovs, Gorky Str. 87, 600000 Vladimir, Russia
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Author to whom correspondence should be addressed.
Metals 2018, 8(6), 439; https://doi.org/10.3390/met8060439
Received: 7 May 2018 / Revised: 6 June 2018 / Accepted: 6 June 2018 / Published: 9 June 2018
This paper deals with the investigation of complex-alloyed nickel aluminides obtained from oxide compounds by aluminothermic reduction. The aim of the work was to study and develop the physicochemical basis for obtaining complex-alloyed nickel aluminides and their application for enhancing the properties of coatings made by electrospark deposition (ESD) on steel castings, as well as their use as grain refiners for tin bronze. The peculiarities of microstructure formation of master alloys based on the Al–TM (transition metal) system were studied using optical, electronic scanning microscopy and X-ray spectral microanalysis. There were regularities found in the formation of structural components of aluminum alloys (Ni–Al, Ni-Al-Cr, Ni-Al-Mo, Ni-Al-W, Ni-Al-Ti, Ni-Cr-Mo-W, Ni-Al-Cr-Mo-W-Ti, Ni-Al-Cr-V, Ni-Al-Cr-V-Mo) and changes in their microhardness, depending on the composition of the charge, which consisted of oxide compounds, and on the amount of reducing agent (aluminum powder). It is shown that all the alloys obtained are formed on the basis of the β phase (solid solution of alloying elements in nickel aluminide) and quasi-eutectic, consisting of the β′ phase and intermetallics of the alloying elements. The most effective alloys, in terms of increasing microhardness, were Al-Ni-Cr-Mo-W (7007 MPa) and Al-Ni-Cr-V-Mo (7914 MPa). The perspective is shown for applying the synthesized intermetallic master alloys as anode materials for producing coatings by electrospark deposition on steel of C1030 grade. The obtained coatings increase the heat resistance of steel samples by 7.5 times, while the coating from NiAl-Cr-Mo-W alloy remains practically nonoxidized under the selected test conditions. The use of NiAl intermetallics as a modifying additive (0.15 wt. %) in tin bronze allows increasing the microhardness of the α-solid solution by 1.9 times and the microhardness of the eutectic (α + β phase) by 2.7 times. View Full-Text
Keywords: intermetallic compounds; aluminothermic reduction; alloying elements; microhardness; microstructure; solid solutions; quasi-eutectic; electrospark deposition intermetallic compounds; aluminothermic reduction; alloying elements; microhardness; microstructure; solid solutions; quasi-eutectic; electrospark deposition
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MDPI and ACS Style

Gostishchev, V.; Ri, E.; Ri, H.; Kim, E.; Ermakov, M.; Khimukhin, S.; Deev, V.; Prusov, E. Synthesis of Complex-Alloyed Nickel Aluminides from Oxide Compounds by Aluminothermic Method. Metals 2018, 8, 439.

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