Formation and properties of Zr-(Ti, Nb)-Cu-Ni-Al bulk metallic glasses

The effect of composition variations and of B or Si addition on the glass f orming ability and thermal stability of Zr-M-Cu-Ni-Al (M = Ti, Nb) bulk met allic glass-forming alloys have been investigated. The structural, acoustic , thermal and elastic properties of the bulk metallic glasses (BMGs) are st udied by X-ray diffractmetery (XRD), differential scanning calorimetry (DSC ) and ultrasonic method. A small amount of boron and silicon addition can s ignificantly affects the GFA and crystallization behaviors and microstructu ral nature of the glass-forming alloys. The small changes of the density an d acoustic velocities in the BMGs relative to its corresponding crystallize d state indicate a similar electronic state and similar atomic interactions between the glassy and crystalline states.