Improving mechanical properties of chip-based aluminum extrudates by integrated extrusion and equal channel angular pressing (iECAP)

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• 作者：M. Haase^a ; ^{Matthias.Haase@iul.tu-dortmund.de} ; N. Ben Khalifa^a ; ^{Nooman.Ben_Khalifa@iul.tu-dortmund.de} ; A.E. Tekkaya^a ; ^{Erman.Tekkaya@iul.tu-dortmund.de} ; W.Z. Misiolek^b ; ^{wzm2@lehigh.edu}
• 关键词：Chip extrusion ; Equal channel angular pressing (ECAP) ; Aluminum alloy recycling ; Die design ; Mechanical properties ; Microstructure
• 刊名：Materials Science and Engineering ; A
• 出版年：2012
• 期刊代码：61_09215093
• 类别：ms
• 出版时间：30 March, 2012
• 卷：539
• 期：Complete
• 页码：194-204
• 文件大小：3553 K

摘要

In order to improve the mechanical properties of profiles extruded from aluminum chips, a four turn equal channel angular pressing tool was integrated into an extrusion die (iECAP die). AA6060 aluminum alloy turning chips were cold pre-compacted to chip-based billets and hot extruded through the iECAP die on a conventional forward extrusion press. Mechanical properties and microstructure of the chip-based billets extruded through the iECAP die were investigated and compared to those extruded through a conventional flat-face die and a porthole die. To evaluate the performance of the iECAP processed chip-based profiles, conventional cast billets were extruded through the flat-face die as a reference material. To investigate the influence of temperature on mechanical properties and microstructure of chip-based profiles, the extrusion was performed at 450 掳C and 550 掳C.

Tensile tests revealed superior mechanical properties of the chip-based billets extruded through the iECAP die in comparison to chip-based billets extruded through the flat-face and the porthole die as well as to cast billets extruded through the flat-face die.