RAPIDLY SOLIDIFIED MAGNESIUM ALLOY COARSE POWDER BY SWAP AND CHARACTERISTICS OF ITS WROUGHT ALLOY

摘要

SWAP (Spinning Water Atomization Process) promised to serve coarse magnesium alloy powder, being significantly safe in handling, with fine microstructures via rapid solidification process. The conventional magnesium alloy, AZ31B (Mg-3%Al-1%Zn-0.3%Mn) and noncombustible magnesium alloy, AMX602 (Mg-6%Al-0.5%Mn-2%Ca) powder were prepared by SWAP, and compacted at room temperature. The green compact with a relative density of about 85% was heated at 473-673 K in Ar gas atmosphere, and immediately consolidated by hot extrusion. Microstructures observation and evaluation of mechanical properties of the wrought AZ31B powder metallurgy (PM) alloy were carried out. As-atomized powder indicated fine grains with 2～5 micron, and its wrought alloy also showed remarkably uniform microstructures with refined grains less than 0.5～1 micron via dynamic recrystallization during hot extrusion.