Synthesis of Composite with the Eutectic Composition of Al–Cu/C System on the Surface of 2024 Aluminium Alloy by High-Frequency Impact Treatment
M. A. Vasylyev$^{1}$, S. M. Voloshko$^{2}$, V. I. Zakiev$^{3}$, A. P. Burmak$^{2}$, Ya. I. Matvienko$^{1}$, A. D. Rud$^{1}$
$^{1}$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
$^{3}$National Aviation University, 1 Lyubomyr Huzar Ave., UA-03058 Kyiv, Ukraine
Received: 21.09.2021. Download: PDF
High-frequency impact treatment (HFIT) of 2024 aluminium alloy with addition of milled for 8 hours eutectic Al–Cu/C powder to the deformation zone is carried out. Structure and mechanical properties of the surface layers of the alloy after HFIT in the air at room temperature for 50 s without and with addition of the powder are studied and compared. As shown, the maximum hardening effect (the increase of microhardness by $\sim$3.5 times) is observed after HFIT of the sample with the powder. According to the results of multi-pass scratch tests, the lowest value of average indenter penetration depth (from 1.2 $\mu$m after the 1$^{\textrm{st}}$ pass to 2.3 $\mu$m after the 8$^{\textrm{th}}$ pass) is observed for the sample after the same treatment. Moreover, the above-mentioned results are also confirmed by three-dimensional surfaces topography. Thus, the highest values of roughness parameters ($R_a$ = 1.31 $\mu$m, $R_z$ = 4.49 $\mu$m) and the percentage increase in the area (by 12.4%) of the surface of the alloy are observed after HFIT with the powder. As shown by means of X-ray diffraction phase analysis, such treatment facilitated the formation of composite on the surface of 2024 aluminium alloy containing metastable Al$_4$Cu$_9$ and stable Al$_2$Cu intermetallic phases. The effect of the powder addition during HFIT on the structure modification and the level of physical-mechanical properties of the alloy is considered.
Key words: high-frequency impact treatment, 2024 aluminium alloy, Al–Cu/C powders, composite, microhardness, surface.
URL: https://mfint.imp.kiev.ua/en/abstract/v43/i11/1455.html
DOI: https://doi.org/10.15407/mfint.43.11.1455
PACS: 61.05.cp, 62.20.Qp, 64.60.My, 68.35.Gy, 81.40.Pq, 81.65.-b
Citation: M. A. Vasylyev, S. M. Voloshko, V. I. Zakiev, A. P. Burmak, Ya. I. Matvienko, and A. D. Rud, Synthesis of Composite with the Eutectic Composition of Al–Cu/C System on the Surface of 2024 Aluminium Alloy by High-Frequency Impact Treatment, Metallofiz. Noveishie Tekhnol., 43, No. 11: 1455—1470 (2021) (in Ukrainian)