Issues »  Volume 37, Issue 1

Ultrasonic Impact Processing of Surface Layer of the BT1-0 Titanium in a Submicrocrystalline State

M. O. Vasylyev$^{1}$, B. M. Mordyuk$^{1}$, D. V. Pavlenko$^{2}$, L. F. Yatsenko$^{1}$

$^{1}$G.V. Kurdyumov Institute for Metal Physics, NAS of Ukraine, 36 Academician Vernadsky Blvd., UA-03142 Kyiv, Ukraine
$^{2}$Zaporizhzhya National Technical University, 64 Zhukovsky Str., 69063 Zaporizhzhya, Ukraine

Received: 16.05.2014. Download: PDF

The influence of the ultrasonic impact treatment on the structure and properties of the surface layer of $\alpha$-titanium in a submicrocrystalline state is investigated. As shown, combining the methods of bulk (twist extrusion) and superficial (ultrasonic impact treatment) severe plastic deformation, it is possible to provide increased strength, wear and corrosion resistance of the surface layers of titanium alloys. As determined, after twist extrusion, the structure with a size of grains of about 200—250 nm is formed in $\alpha$-Ti. By means of the Auger electron spectroscopy, the changes of chemical state of the $\alpha$-Ti surface are revealed after the twist extrusion followed by ultrasonic impact treatment in argon atmosphere and in liquid nitrogen. Ultrasonic impact treatment of the $\alpha$-Ti in argon leads to saturation of the surface layer with atoms of oxygen (to 40 at.%), and the processing in liquid nitrogen leads to saturation with atoms of N (to 21 at.%) and O (to 24 at.%), indicating that the mechanochemical synthesis of titanium nitride and oxynitride takes place. The microhardness of the $\alpha$-Ti surface layer after ultrasonic impact treatment in argon is increased by three times, and in liquid nitrogen–by 3.5 times.

Key words: BT1-0 titanium, surface layer, severe plastic deformation, twist extrusion, ultrasonic impact treatment.

URL: http://mfint.imp.kiev.ua/en/abstract/v37/i01/0121.html

DOI: https://doi.org/10.15407/mfint.37.01.0121

PACS: 43.35.+d, 62.20.Qp, 68.35.Gy, 68.55.J-, 68.55.Nq, 81.20.Hy, 81.65.Lp

Citation: M. O. Vasylyev, B. M. Mordyuk, D. V. Pavlenko, and L. F. Yatsenko, Ultrasonic Impact Processing of Surface Layer of the BT1-0 Titanium in a Submicrocrystalline State, Metallofiz. Noveishie Tekhnol., 37, No. 1: 121—134 (2015) (in Russian)

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