2003 Volume 44 Issue 11 Pages 2271-2275
We examined the thermal stability, glass-forming ability (GFA) and mechanical properties of Mg-Y-Zn(-Cu) base alloys produced by melt-spinning and copper mold casting methods. The glass-forming ability of Mg-Y-Zn ternary glassy alloys was not high enough to form a bulk glassy alloy by the copper mold casting method. The Cu addition to form the Mg65Y10Zn25−xCux (x=0 to 25 at%) quaternary alloys resulted in a significant increase in GFA and thermal stability of the amorphous phase. The compressive fracture strength, Young’s modulus and ductility of the Mg65Y10Zn5Cu20 bulk glassy alloy are higher than those of Mg65Y10Cu25 bulk glassy alloy, although the GFA of the Mg65Y10Zn5Cu20 alloy is slightly lower than that of the Mg65Y10Cu25 alloy.