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Ya. I. Matvienko, O. D. Rud, S. S. Polishchuk, V. V. Trachevski, O. M. Fesenko, A. D. Yaremkevych, O. Yu. Khyzhun
«Spectroscopic Studies of Changes in the StructuralPhase State of Elementary Powders of the AlCu/C System During Mechanical Activation Processing»
077–088 (2020)

PACS numbers: 62.20.Qp, 62.23.Kn, 81.15.Jj, 81.40.Pq, 81.65.Lp, 81.70.Jb, 82.80.-d

The evolution of both structure and phase composition of the Al33 wt.% Cu and Al80 wt.% Cu powders with additives of 5 wt.% of graphite during their mechanical alloying and annealing are examined. The AlCu/C powders after corresponding treatments are studied by x-ray diffraction analysis, nuclear magnetic resonance (NMR), Raman spectroscopy and x-ray photoelectron spectroscopy (XPS). The milling of the powder for 1 to 8 hours leads to the change of the graphite-additives crystalline structure into amorphous one. As shown, the mechanical alloying of the powders results in the formation of disordered Al\(_4\)u\(_9\)-phase (structural type A2) based on b.c.c. lattice. Moreover, milling of the powder with eutectic Al33 wt.% Cu/5 wt.% C composition for 2 to 8 hours leads to the formation a non-stoichiometric Al\(_2\)u\(_{1-x}\) phase ( 0.012‹ x ‹ 0.059) besides b.c.c.-lattice-based Al\(_4\)u\(_9\)-phase. Annealing of the Al33 wt.% Cu/5 wt.% C and Al80 wt.% Cu/5 wt.% C powders at 500\(^\circ\)C for 2 hours results in the formation of phase compositions close to equilibrium (Al + Al2Cu phase and ordered \(\gamma_2\)-Al\(_4\)u\(_9\) phase, respectively) as well as in the reaction between aluminium and carbon with the formation of carbide Al\(_4\)u\(_3\).

Keywords: AlCu/C powders, mechanical alloying, amorphous graphite, Al\(_4\)u\(_9\) phase, Al2Cu phase, carbide Al\(_4\)u\(_3\)

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