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Shear crack formatlon in cold drawing of magnesium and cobalt wires

Eickemeyer J., Falter M., Guth A.

International Journal of Applied Mechanics and Engineering

2007

Vol. 12, no 4

1173-1179

The process of surface roughness development on cold drawn magnesium and cobalt wires inside the conical drawing hole was analysed using a wire stick preparation. It is shown that the hep-metals cobalt and magnesium are prone to be roughened in the conical part of the drawing hole. This roughening, including shear localization, leads to shear cracking. Shear cracks grow from the surface into the peripheral material of the wire in the die exit zone.