The processes of extruding and forging were applied to a Mg-Y-Nd-Zr alloy separately, then the deformed specimens were solid solution treated and aged. The structural evolution of this alloy was analyzed by means of optical microscopy, scanning electron microscopy and energy dispersive X-ray spectroscopy. The mechanical performance of cast, extruded, forged and heat treated alloy specimens were tested at room temperature and 250 degrees C. The study shows that complete recrystallization occurred when samples were extruded at temperatures of 350-400 degrees C, and better mechanical performance was achieved. Those specimens which were forged after being extruded, gave mechanical performance at room temperature and 250 degrees C which were improved compared with extruded specimens. Solid solution treatment and aging after deformation caused the size of precipitated phases near grain boundaries to become finer and more homogeneous, so mechanical performance of these specimens was enhanced.

Keywords: magnesium-RE alloy; plastic deformation; microstructure; mechanical performance