Influence of Accumulative back Extrusion and Lubricants on the Hardness of Al 6063 Alloy

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J S. Ajiboye
B. A. Okey-Amechi

Abstract

The current accumulative back extrusion (ABE), a severe plastic deformation (SPD) process, is intends to improve hardness of commercially available Al 6063 alloy without compromising its ductility after undergoing plastic deformation. The novel technique consists of three innovative punch setup design to act sequentially. The first punch, smaller than the billet, pierce through with excess material flowing backward forming a cup shape, this is followed by the second punch, which is hollow, pushing the cup flanged back and thereby pushing the inner punch backward, extruding a rod. The final stage of pushing the whole billet back to the initial size and shape is achieved by the third punch which has the same diameter as the billet. This technique (ABE) was applied to a commercially aluminum specimen AA6063 to see the possible degree of improvement. It was discovered that the hardness of AA6063 was increased from 15HRE to 26HRE during cup extrusion and to 37HRE after the final stage of rod extrusion in a single operation. The whole cycle can be repeated to achieve higher hardness and improve mechanical properties.

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