Recycling of AZ91 Mg alloy through consolidation of machined chips by extrusion and ECAP

Abstract AZ91 Mg alloy recycled by a solid state process and equal channel angular pressing (ECAP) exhibited a superior strength. The mechanical properties of AZ91 Mg alloy recycled from machined chips by extrusion at 623 K and ECAP at 573 K and 623 K were compared with those of the reference alloy which was produced from an as-received AZ91 Mg alloy block under the same conditions as the recycled alloy. The recycled specimens show a higher strength at room temperature than the reference alloy. The improvement of the tensile properties is attributed not only to the small grain size, but also to the dispersed oxide contaminants.

[1]  E. Pereloma,et al.  Microstructures and properties of copper processed by equal channel angular extrusion for 1–16 passes , 2004 .

[2]  K. Xia.  Bulk Ultrafine and Nanostructured Materials from Consolidation of Particles by Severe Plastic Deformation , 2008 .

[3]  M. Mabuchi,et al.  Deformation Characteristics of Recycled AZ91 Mg Alloy Containing Oxide Contaminants , 2008 .

[4]  M. Qian,et al.  Discussions on grain refinement of magnesium alloys by carbon inoculation , 2005 .

[5]  Rimma Lapovok,et al.  Deformation field variations in equal channel angular extrusion due to back pressure , 2008 .

[6]  Mamoru Mabuchi,et al.  Enhanced corrosion properties of pure Mg and AZ31 Mg alloy recycled by solid-state process , 2006 .

[7]  H. Chang,et al.  Microstructure and mechanical properties of Mg–Zn–Ca alloy processed by equal channel angular pressing , 2009 .

[8]  Hiroyuki Watanabe,et al.  Consolidation of machined magnesium alloy chips by hot extrusion utilizing superplastic flow , 2001 .

[9]  Kun Wu,et al.  Compressive deformation of Mg-Zn-Y-Zr alloy processed by equal channel angular pressing , 2008 .

[10]  Yasuo Yamada,et al.  Blow Forming of Mg Alloy Recycled by Solid-State Recycling , 2004 .

[11]  W. W. Harvey.  Material balance as the basis for process control in electrowinning and electrorefining , 1980 .

[12]  Masataka Hakamada,et al.  Fatigue behavior of AZ31 magnesium alloy produced by solid-state recycling , 2006 .

[13]  T. Langdon,et al.  Processing of a magnesium alloy by equal-channel angular pressing using a back-pressure , 2009 .

[14]  Mamoru Mabuchi,et al.  Tensile Properties of the ZK60 Magnesium Alloy Produced by Hot Extrusion of Machined Chip , 1998 .

[15]  Y. Kawamura,et al.  Microstructures and Mechanical Properties of Mg96Zn2Y2 Alloy Prepared by Extrusion of Machined Chips , 2009 .

[16]  B. Mordike,et al.  Magnesium: Properties — applications — potential , 2001 .

[17]  W. Gan,et al.  Equal Channel Angular Pressing of Magnesium Alloy Containing Quasicrystal Phase , 2006 .

[18]  S. Kamado,et al.  Mechanical properties of SiC particle–AZ31B magnesium alloy machined chips composites prepared by hot extrusion after ECAP , 2008 .