Phase Transformations during Mechanical Alloying of Powders with Eutectic Composition of Al–Cu and Al–Cu/C Systems and Their Effect on the Structure and Mechanical Properties of the Composites

Metal Scrap to Hydrogen: Manufacture of Hydroreactive Solid Shapes via Combination of Ball Milling, Cold Pressing, and Spark Plasma Sintering

“…No copper was detected for all samples obtained with spark plasma sintering. In the study [74], ball milling of an Al-Cu powder mixture led to the formation of a metastable Al4Cu9 and stable Al2Cu compounds, and the metastable phase was transformed into the stable phase after calcination at 500 °C. Probably, the same explanation could be applied to the MgCuAl2 elimination under the same temperature.…”

“…[55][56][57][58][59][60] or ball milling with additives with further powders compacting into pellets [53,61,62]. The known techniques for the effective coalescence of aluminum powder particles (with spherical or irregular shapes) include uniaxial compression [63,64]; cold compacting at 200-600 MPa with further sintering at 500-650 • C [65][66][67][68][69]; spark plasma sintering, commonly under 20-50 MPa and 400-600 • C [70][71][72][73]; and cold pressing at ~600-8000 MPa [67,74]. The reported densities of the compacted samples achieved ~94-99% for hot uniaxial compression, ~92-98% for cold pressing, 98-99% for hold compacting and sintering, and over 99% after spark plasma sintering.…”

Effect of Non-Equilibrium Conditions of Reactions Between Cu and Al in the Solid-State on Al$_4$Cu$_9$ Phase Formation in Cu–Al System

“…стом Al до ≅ 12 ат.% також відмічають в роботі [17]. Окрім того, положення піків від β-фази співпадають із положенням піків від метастабільної невпорядкованої ОЦК-Al 4 Cu 9 -фази, виявленої у МЛ порошках Al-Cu евтектичного складу в наших попередніх роботах [29][30][31].…”