Issues »  Volume 39, Issue 1

Peculiarities of Structure and Phase Formation in the Surface Layers of 2024 Aluminium Alloy due to Ultrasonic Impact Treatment in Various Environments

M. O. Vasylyev$^{1}$, 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-03680 Kyiv-142, Ukraine
$^{2}$National Technical University of Ukraine ‘KPI’, 37 Peremohy Ave., 03056 Kyiv, Ukraine

Received: 03.11.2016. Download: PDF

The hardening process of the surface layers of 2024 aluminium alloy caused by structural evolution and mass transfer of Fe induced by ultrasonic impact treatment (UIT) with the pin from Armco-Fe carried out in both the air and an inert environment is studied. The cyclical nature of changes in microhardness, which comprises the alternating stages of hardening and plasticization, is confirmed. The increase in the microhardness of the surface layers of 2024 aluminium alloy of $\cong$ 30 $\mu$m thick after the UIT process with the pin from Armco-Fe in an inert environment (4 GPa) and in the air (up to $\cong$ 9 GPa) is associated with the decrease in the size of coherent scattering areas during severe plastic deformation and with the increase in crystal lattice microstrains, with mechanochemical interaction between Al and Fe with the formation of Fe–Al intermetallic phases as well as between Cu and O during UIT in the air. A possible mechanism for the formation of the iron-containing surface layer by severe plastic deformation and mass transfer of iron caused by repetitive impact loading at UIT with the pin of Armco-Fe is discussed.

Key words: ultrasonic impact treatment (UIT), surface, mass transfer, mechanical alloying, aluminium alloys, inert environment.

URL: http://mfint.imp.kiev.ua/en/abstract/v39/i01/0049.html

DOI: https://doi.org/10.15407/mfint.39.01.0049

PACS: 43.35.+d, 68.55.Ln, 68.55.Nq, 81.40.Lm, 81.65.-b, 83.10.Tv, 83.50.Uv

Citation: M. O. Vasylyev, B. M. Mordyuk, S. I. Sidorenko, S. M. Voloshko, and A. P. Burmak, Peculiarities of Structure and Phase Formation in the Surface Layers of 2024 Aluminium Alloy due to Ultrasonic Impact Treatment in Various Environments, Metallofiz. Noveishie Tekhnol., 39, No. 1: 49—68 (2017) (in Ukrainian)

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