Extrusion die geometry effects on the energy absorbing properties and deformation response of 6063-type al–mg–si aluminum alloy.
Gbenebor, O.P. Fayomi, O.S.I. Popoola, A.P.I. Inegbenebor, A.O. Oyawale, F.
Gbenebor, O.P.
Fayomi, O.S.I.
Popoola, A.P.I.
Inegbenebor, A.O.
Oyawale, F.
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Abstract
The response of 6063-type Al–Mg–Si alloy to deformation via extrusion was studied using tool steel dies with 15 degrees, 30 degrees, 45 degrees, 60 degrees and 75 degrees entry angles. Compressive loads were subjected to each sample using the AVERY DENISON machine, adapted to supply a compressive load on the punch. The ability of the extrudate to absorb energy before fracture was calculated by integrating numerically the polynomial relationship between the compressive stress and sample strains. Strain rate was calculated for each specimen and the deformation zone length was mathematically derived from the die geometry to decipher its influence on both lateral and axial deformations. Results showed that extruding with a 15 degrees die was the fastest as a result of the low flow stress encountered. Outstanding compressive strength, plastic deformation, strain rate and energy absorbing capacity were observed for the alloy extruded with a 75 degrees die angle. Increase in die angles led to a decrease in deformation zone length and samples deformed more in the axial direction than in the lateral except for the 45o die which showed the opposite; the sample also showed the least
ductility.
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Date
2013-01-12
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Publisher
Elsevier
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Keywords
Extrudate, Strain rate, Compressive strength, Deformation length zone, Die angle, Energy absorbing property