The effect of Pd addition on the glass-forming ability and thermal stability of the Zr55Al10Cu30Ni5-xPdx (x=0, 1, 3, 5 at. pct) alloys upon copper-mold casting has been investigated. The structure, thermal stability and microstructure were studied by X-ray diffraction (XRD), differential scanning calorimetry (DSC) and transmission electron microscopy (TEM), respectively. It was identified that a new bulk amorphous alloy with the larger supercooled liquid region △Tx of 100 K is obtained with substituting Ni by 1 at. pct Pd. However, the addition of 3 at. pct Pd causes a little increase of thermal stability and an evident decrease of the GFA. The full substitution Ni by 5 at. Pct Pd induces the thermal stability and GFA to decrease simultaneously. It indicates that the thermal stability increases and the GFA decreases with the increasing of Pd content.
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