Structure and Mechanical Properties of Al–Cu/C Composites Produced by Mechanical Alloying and Solid-State Sintering

Ya. I. Matvienko$^{1}$, S. S. Polishchuk$^{1}$, A. D. Rud$^{1}$, T. M. Mika$^{1}$, V. I. Bondarchuk$^{1}$, S. A. Demchenkov$^{2}$

$^{1}$G. V. Kurdyumov Institute for Metal Physics, NAS of Ukraine, 36 Academician Vernadsky Blvd., UA-03142 Kyiv, Ukraine
$^{2}$E. O. Paton Electric Welding Institute, NAS of Ukraine, 11 Kazymyr Malevych Str., UA-03150 Kyiv, Ukraine

Received: 12.05.2019. Download: PDF

Hypoeutectic and eutectic Al–Cu composites with 5% wt. of graphite additives are prepared using mechanical alloying (MA) of elemental powders and following hot pressing of mixtures at 480–510°C and 30 MPa. The obtained powders and sintered samples are studied using X-ray diffraction (XRD), scanning electron microscopy (SEM), and differential scanning calorimetry (DSC). The MA during 8 hours of all powder compositions results in the formation of Cu$_9$Al$_4$ and CuAl$_2$ phases as well as Al(Cu) solid solution. Subsequent sintering leads to the decomposition of the metastable Cu$_9$Al$_4$ phase. As shown, the crystalline structure of graphite additives transforms into amorphous one during MA, while the consequent sintering results in the Al$_4$C$_3$ carbide formation. Moreover, the introduction of graphite additives leads to increasing of both the highly dispersed particles amount in mechanically alloyed powder and the volume fraction of metastable Cu$_9$Al$_4$ and stable CuAl$_2$ intermetallic phases. The effects of both graphite additives and Cu content (17 and 33% wt.) on microstructure and mechanical properties of sintered Al–Cu composites are considered. Possible strengthening mechanisms for Al–Cu and Al–Cu/C composites are discussed.

Key words: Al–Cu/C, metal matrix composites, mechanical alloying, solid-state sintering, powder metallurgy.



PACS: 61.05.cp, 62.25.-g, 64.60.My, 64.70.kd, 81.20.Ev, 81.20.Wk

Citation: Ya. I. Matvienko, S. S. Polishchuk, A. D. Rud, T. M. Mika, V. I. Bondarchuk, and S. A. Demchenkov, Structure and Mechanical Properties of Al–Cu/C Composites Produced by Mechanical Alloying and Solid-State Sintering, Metallofiz. Noveishie Tekhnol., 41, No. 8: 1035—1054 (2019) (in Ukrainian)

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