Fabrication of Micro-sized Al/Cu Clad by Repeated Hydrostatic Extrusion and Its Mechanical Properties

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.

Keywords:

• Annealing
• Cladding
• Extrusion
• Intermetallic
• Microscopy
• Microstructure

Notes

Color versions of one or more of the figures in the article can be found online at www.tandfonline.com/lmmp.