Changes in the Structure of the Co–15%W Alloy After Electrospark Alloying and Annealing
Yu. Vronska, N. Zaitseva, O. Shmatko
G. V. Kurdyumov Institute for Metal Physics, NAS of Ukraine, 36 Academician Vernadsky Blvd., UA-03142 Kyiv, Ukraine
Received: 12.05.2021; final version - 28.05.2021. Download: PDF
The structures of Co–W alloys in the region of solid solutions (0–13.06 at.% W) and intermetallic compound Co$_3$W are studied by the methods of X-ray diffraction analysis using Fe$K_\alpha$-radiation. As found, the initial structure of the cast alloy consists of 1/3 of a solid solution of $\beta$-Co with f.c.c. lattice and 2/3 of $\alpha$-Co with hexagonal close-packed crystal lattice. Annealing of the alloy leads to the decomposition of the solid solution with the precipitation of intermetallic Co$_3$W, and the redistribution of the amount of solid solutions in favour of $\alpha$-Co. Electrospark doping of the surface with a tungsten electrode leads to an increase the tungsten in the solid solution and as a consequence to increase the intensity of the cellular reaction.
Key words: cellular precipitation, electrospark alloying, annealing, structure of Co–W alloy.
PACS: 52.80.Mg, 61.66.Dk, 64.75.Nx, 68.35.Dv, 81.40.Cd, 81.40.Ef
Citation: Yu. Vronska, N. Zaitseva, and O. Shmatko, Changes in the Structure of the Co–15%W Alloy After Electrospark Alloying and Annealing, Metallofiz. Noveishie Tekhnol., 43, No. 7: 985—993 (2021) (in Ukrainian)