Solid State Recycling with High Mechanical Qualification of Magnesium Alloys

摘要

Huge amount of energy is needed for melting/remelting and solidification of magnesium alloy scraps. In addition, dross and slug are inevitably ejected from the conventional recycling processes. Since magnesium alloys are easy to be oxidized or reacted, SF6 or other gaseous hazardous agents must be used even for recycling. Furthermore, the above recycled alloys have insufficient grade in mechanical properties, so that these materials cannot be used repetitively for fabrication of product with the similar grade as that made from virgin materials. The solid state recycling is proposed as a candidate environmentally benign manufacturing to overcome the above difficulties. In addition to the energy saving during the process, little or no hazardous components are ejected from this recycling. Owing to the in-process refinement in microstructure, the mechanical properties can be promoted to nearly the same level for the virgin materials. Case studies are employed to quantitatively describe this up-grading in the present solid-state recycling and to discuss its advantageous features.