| 2020 №01 (05) |
DOI of Article 10.37434/sem2020.01.06 |
2020 №01 (01) |
Electrometallurgy Today (Sovremennaya Elektrometallurgiya), 2020, #1, 46-51 pages
Influence of crystallization rate on the microstruсture and properties of Ti–TiB alloy
D.O. Remisov, Yu.I. Bogomol, P.I. Loboda
NTUU «Igor Sikorsky Kyiv Polytechnic Institute». 37 Pobedy Ave., 03056, Kyiv, Ukraine. E-mail: decan@iff.kpi.ua
Abstract
Kinetics of the process of directional crystallization of a eutectic alloy of Ti–TiB system under the conditions of cruciblelss zone melting of powder compacts was studied. It is proved that increase of the alloy crystallization rate from 1 up to 4 mm/min leads to 2.0...2.5 times increase of the number of TiB inclusions, elongated predominantly in the direction of crystallization, that agrees well with the impact of diffusion mass transfer in the melt ahead of the crystallization front. Increase of temperature gradient in the eutectic alloy crystal leads to approximately two times reduction of the dimensions and increase of the number of inclusions by 40 and more times. Hardness value, measured by Vickers method at more than 3 N loads on the indenter, can be an integral characteristic of the properties of directionally crystallized alloy. Ref. 6, Tabl. 2, Fig. 9.
Keywords: crystal; crucibleless zone melting; titanium; alloy; structure; diboride; titanium alloy
Received 18.02.2020
References
1. Loboda P.I., Remisov D.A., Grigorenko S.G. et al. (2019) Uniformity of microstructure of Ti-TiB alloy produced under the conditions of electron beam remelting. Sovrem. Elektrometall., 3, 55-61 [in Ukrainian]. https://doi.org/10.15407/sem2019.03.082. Loboda P.I., Soloviova T.O., Bogomol Yu.I. et al. (2015) Effect of the crystallization kinetic parameters on the structure and properties of a eutectic alloy of the LaB6-TiB2 system. J. of Superhard Materials, 37(6), 394-401. https://doi.org/10.3103/S1063457615060040
3. Mochalov V.I. (2012) Growing optical crystals. St.Petersburg [in Russian].
4. Burkhanov G.S. (1993) High-purity metal single-crystals. High-purity substances, 3, 7-14 [in Russian].
5. Kartavykh A.V., Asnis E.A., Piskun N.V. (2015) Microstructure and mechanical properties control of γTiAl(Nb, Cr, Zr) intermetallic alloy by induction float zone processing. J. Alloys Compd, 643, 182-186. https://doi.org/10.1016/j.jallcom.2014.12.210
6. Kim J.H., Kim S.W., Leeetal H.N. (2005) Effects of Si and C additions on the thermal stability of directionally solidified TiAl-Nb alloys. Intermetallics, 13, 1038-1047. https://doi.org/10.1016/j.intermet.2004.10.010
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