Laser Doping of Titanium with Transition Metals of the Fe Group
V. V. Gіrzhon, O. V. Smolyakov, O. F. Zdorovets
Zaporizhzhya National University, 66 Zhukovskogo Str., 69600 Zaporizhzhya, Ukraine
Received: 07.02.2017; final version - 22.03.2017. Download: PDF
The structural-phase state of surface layers of the industrial titanium alloy Grade 2 after laser alloying by the iron, cobalt, and nickel powders are studied by the x-ray and metallographic analysis. The phase composition in zone of laser alloying is basically determined by the solubility of alloying component in the $\beta$-titanium. At the alloying by iron, which has a maximum solubility, the formation of the solid solution based on the $\beta$-phase occurs. At the alloying by nickel, which has a minimum solubility, mainly intermetallic phases of Ti$_2$Ni with f.c.c. lattice and TiNi with monoclinic lattice are formed. The laser alloying by cobalt results in the formation of $\beta$-solid solution and TiCo phase with a cubic lattice. The formation of the equilibrium Ti$_2$Co phase is not observed. As shown, the use of glue on the organic base as a binder alloying coating in all cases results in the formation of titanium carbide TiC that leads to increase of the microhardness in the zone of laser alloying.
Key words: titanium alloy, laser alloying, phase composition, intermetallic compounds, titanium carbide.
PACS: 62.20.Qp, 68.55.Ln, 68.55.Nq, 81.05.Ni, 81.10.Fq, 81.16.Mk, 81.65.Lp
Citation: V. V. Gіrzhon, O. V. Smolyakov, and O. F. Zdorovets, Laser Doping of Titanium with Transition Metals of the Fe Group, Metallofiz. Noveishie Tekhnol., 39, No. 4: 507—515 (2017) (in Russian)