Extrusion die geometry effects on the energy absorbing properties anduddeformation response of 6063-type Al-Mg-Si alu1ninum alloy*

摘要

The response of 6063-type AI-Mg-Si alloy to deformation via extrusion was studied using tool steel diesudwith 15°,30°,45°,60° and 75o entry angles. Compressive loads were subjected to each sample using theudAVERY DENISON machine, adapted to supply a compressive load on the punch. The ability of the extrudateudto absorb energy before fracture was calculated by integrating numerically the polynomial relationshipudbetween the compressive stress and sarnple strains. Strain rate was calculated for each specimen andudthe deformation zone length w~s mathematically derived from the die geometry to decipher its influenceudon both lateral and axial deformations. Results shcv-1Ed that cxtntr:ling with a 15° die was the fastest as audresult of the low flow ;.iress encountered. Outstanding compressive strer:gth. plastic deformation, strainudrate and e:1e1gy absorl'inz ca1~acity were observed for the alloy extruded with a 75" di~> angle. Increase inuddie ;mgles led to a decreJ~;e in cleformJtion zone length and samples deformed more in the axial directionudthan in the lateral e>.cep~ for the 45° die which showed the opposite; the sample also showed the leastudductility.