Abstract
Al/Cu clads were fabricated by hydrostatic extrusion at 523 K, and their microstructure and mechanical properties were evaluated. The cell size of the Al/Cu clads decreases from 12 mm to 600 µm after three passes of extrusion. Intermetallic compounds (IMCs) appeared at the interface of Al/Cu clad during annealing at 683 K, and their sizes increased as a function of the annealing process. X-ray microanalysis and scanning electron microscope studies showed that the intermetallic species were CuAl2, CuAl, and Cu3Al2, and the thickness of the IMC layers increased at different rates depending on the annealing time. The formation and growth of IMCs resulted in an increase of yield strength and a decrease in elongation of the clads under tensile testing.
Notes
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