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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...
Wire drawing experiments were performed under laboratory conditions using the hexagonal close packed metals cobalt and magnesium. It was experimentally shown that the material flow in the peripheral region controls the drawability of both metals at ambient temperature. Further, it became apparent that the roughness peak parameter Rz(DIN) was a reasonable measure to characterise the wire surface with...
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