Solid-state recycling of AZ91D magnesium alloy chips

• Published in: Transactions of Nonferrous Metals Society of China Vol. 22; pp. s68 - s73
• Main Authors: HU, Mao-liang, JI, Ze-sheng, CHEN, Xiao-yu, WANG, Qu-dong, DING, Wen-jiang
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.10.2012
• Subjects: alloy chips; AZ91D magnesium alloy; extruding temperature; hot extrusion; solid-state recycling; strain rate; solid-state recycling; strain rate; hot extrusion; AZ91D magnesium alloy; alloy chips; extruding temperature
• ISSN: 1003-6326
• DOI: 10.1016/S1003-6326(12)61685-9

A method for recycling AZ91D magnesium alloy chips by solid-state recycling was studied. The experiments were carried out adopting the cold-press pressure and hot extrusion. The results indicate that recycled specimens of AZ91D magnesium alloy present better mechanical properties and consist of fine grains due to dynamic recrystallization. The mechanisms of dynamic recrystallization depend on plastic deformation process and change with the deformation temperature. At 300-350 °C, the deformation mechanisms are associated with the operation of basal slip and twinning, and the “necklace” structures are formed. At 350-400 °C, the cross slip results in the formation of new grains and grain refinement. At above 400 °C, the dynamic recrystallization mechanisms are controlled by dislocation climb, and recrystallized grains are homogeneous. The tensile strength of recycled specimens increases with the increase of the strain rate. When the strain rate is overhigh, the cracks and fractures in the surface appear and affect the tensile strength of recycled specimens.