2006 Volume 47 Issue 8 Pages 2072-2075
A levitation melting-forging (LMF) method was developed to prepare glassy Zr55Cu30Ni5Al10, Ni53Nb20Ti10Zr8Co6Cu3, Ti45Cu25Ni15Zr5Sn5Al5 and Cu55Zr25Ti15Ni5 alloy parts with various shapes of coin, ring and dumbbell of 1 mm in thickness. The glassy alloy samples of 1 mm in thickness for tensile test were also produced by the LMF method. These samples were shaped directly from liquid without any intermediate process. The glassy structure in the samples examined by XRD and DSC is independent of sites. The results show the absence of partial crystallization in the glassy alloy coin prepared by LMF, however, a small quantity of crystallization is found in the glassy alloy coin prepared by copper mold casting. This may be due to the suppression of heterogeneous nucleation resulting from non-contact with container. The density of defects in the glassy alloys prepared by the LMF was decreased significantly because of the absence of spurt.