Issues »  Volume 37, Issue 9

Evolution of Structural State and Microhardness of Surface of D16 Aluminium Alloy in Consequence of Ultrasonic Shock Treatment in Different Atmospheres

M. O. Vasyliev$^{1}$, B. M. Mordyuk$^{1}$, S. I. Sidorenko$^{2}$, S. M. Voloshko$^{2}$, A. P. Burmak$^{2}$

$^{1}$G. V. Kurdyumov Institute for Metal Physics, NAS of Ukraine, 36 Academician Vernadsky Blvd., UA-03142 Kyiv, Ukraine
$^{2}$National Technical University of Ukraine ‘Igor Sikorsky Kyiv Polytechnic Institute’, 37 Peremohy Ave., UA-03056 Kyiv, Ukraine

Received: 09.09.2015. Download: PDF

The D16 aluminium alloy is treated by ultrasonic impact treatment (UIT) in chemically active and neutral atmospheres under quasi-hydrostatic compression that provides more efficient surface strengthening comparing to the heat treatment and classical UIT schemes. As shown, it is possible to form durable oxide coatings with the thickness of several tens of micrometers on the alloy surface simultaneously with the low-temperature deformation of grain structure dispersion by means of UIT within the air. Increasing D16 surface microhardness (up to 2.5 times) by UIT in the inert atmosphere (Ar, He) is caused by the modification of dislocation structure, nanocrystalline structure formation due to the deformation, and formation of nanoscale precipitates of $S^{ʹ}$-Al$_{2}$CuMg hardening phase. The unique opportunity of surface microhardness increasing (up to $\cong$ 5 times) by UIT in a liquid nitrogen (at 77.4 K) due to the influence of synergetic processes of nanostructure formation and mechanochemical interaction of aluminium with nitrogen during cryo-deformation is demonstrated. The model of surface strengthening by means of the structure and phase mechanisms is proposed.

Key words: nanostructure, surface, quasi-hydrostatic compression, cryo-deformation, ultrasonic impact treatment (UIT).

URL: http://mfint.imp.kiev.ua/en/abstract/v37/i09/1269.html

DOI: https://doi.org/10.15407/mfint.37.09.1269

PACS: 43.35.+d, 61.72.Ff, 81.40.Ef, 81.40.Lm, 81.40.Pq, 81.65.-b, 83.10.Tv

Citation: M. O. Vasyliev, B. M. Mordyuk, S. I. Sidorenko, S. M. Voloshko, and A. P. Burmak, Evolution of Structural State and Microhardness of Surface of D16 Aluminium Alloy in Consequence of Ultrasonic Shock Treatment in Different Atmospheres, Metallofiz. Noveishie Tekhnol., 37, No. 9: 1269—1289 (2015) (in Ukrainian)

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