The effect of nitriding temperature on the formation of surface layers of vanadium-titanium alloy Ti–6Al–4V

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Abstract

In this work, using the methods of atomic force microscopy (AFM), X-ray photoelectron spectroscopy (XPS) and X-ray diffraction analysis (XRD), the features of the formation of surface morphology, chemical and phase composition of near-surface and surface layers during ion-plasma processing of the Ti–6Al–4V (VT6) alloy in a glow discharge plasma of N+ ions were studied. depending on the temperature of the samples. It has been shown that increasing the sample temperature from 300 to 700°С during processing leads to an increase in the surface roughness parameters Ra and Rz, due to the formation of titanium nitrides Ti2N and TiN on the surface of the alloy. Based on the conducted research, it is assumed that the formation of thin near-surface layers (~20 nm) during treatment in nitrogen plasma without heating and with heating to 300°С is determined by the oxidation processes of alloy components, and when processing with heating to 500 and 700°С by nitrogen diffusion processes.

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About the authors

V. L. Vorobyev

Udmurt Federal Research Center, Ural Branch of the Russian Academy of Sciences

Author for correspondence.
Email: Vasily_L.84@udman.ru
Russian Federation, Izhevsk

V. S. Gladysheva

Udmurt Federal Research Center, Ural Branch of the Russian Academy of Sciences

Email: Vasily_L.84@udman.ru
Russian Federation, Izhevsk

S. G. Bystrov

Udmurt Federal Research Center, Ural Branch of the Russian Academy of Sciences

Email: Vasily_L.84@udman.ru
Russian Federation, Izhevsk

P. V. Bykov

Udmurt Federal Research Center, Ural Branch of the Russian Academy of Sciences

Email: Vasily_L.84@udman.ru
Russian Federation, Izhevsk

V. Ya. Bayankin

Udmurt Federal Research Center, Ural Branch of the Russian Academy of Sciences

Email: Vasily_L.84@udman.ru
Russian Federation, Izhevsk

A. L. Ulyanov

Udmurt Federal Research Center, Ural Branch of the Russian Academy of Sciences

Email: Vasily_L.84@udman.ru
Russian Federation, Izhevsk

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Supplementary files

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2. Fig. 1. AFM images of the surface morphology of the studied samples: (a) – original sample; (b) – N+ plasma with heating of samples to 300°C; (c) – N+ plasma with heating of samples to 500°C; (d) – N+ plasma with heating of samples to 700°C.

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3. Fig. 2. Distribution profiles of elements in samples of titanium alloy VT6 in the initial state (a) and after treatment in nitrogen plasma without heating (b).

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4. Fig. 3. Distribution profiles of elements in titanium alloy VT6 after treatment in N+ ion plasma with heating of samples to 300°C (a); 500°C (b); 700°C (c).

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5. Fig. 4. Distribution profiles of nitrogen (a) and oxygen (b) in VT6 samples treated in N+ ion plasma under different conditions: initial sample (1), N+ ion plasma without heating the samples (2) and with heating to temperatures of 300°C (3); 500°C (4); 700°C (5).

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6. Fig. 5. O1s XPS spectrum obtained from a depth of ~20 nm in sample BT6 after plasma treatment without heating (a); with heating at 300°C (b); 500°C (c); 700°C (d).

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7. Fig. 6. N1s XPS spectrum obtained from a depth of ~20 nm in sample BT6 after plasma treatment without heating (a); with heating at 300°C (b); 500°C (c); 700°C (d).

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8. Fig. 7. XPS spectra of Ti2p of VT6 samples obtained from a depth of ~20 nm in the initial state (1); after plasma treatment without heating (2); with heating of samples to 300°C (3); 500°C (4); 700°C (5).

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9. Fig. 8. Diffraction patterns of VT6 titanium alloy samples in the initial state (1); after treatment in N+ ion plasma without heating (2), and with heating of samples to temperatures of 300°C (3), 500°C (4), 700°C (5).

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10. Fig. 9. Relative change in microhardness of VT6 titanium alloy samples as a result of treatment in N+ ion plasma without heating (2); with heating of samples to temperatures of 300°C (3), 500°C (4), 700°C (5).

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