Abstract
AZ r 55Cu30Ni5Al10 bulk metallic glass master alloy ingot was made by arc melting using high purity Zr (99.9%), Cu (99.9%), Ni (99.9%) and Al (99.9%), and then fully amorphous specimens of 75 � 50 � 2 mm metallic glass square plates were prepared by copper mold casting in an Ar atmosphere. The stir-in-plate and butt welding experiments of the Zr55Cu30Ni5Al10 bulk metallic glass were performed using a position-controlled FSW machine. The tool, which was made of SKD61, had a 25 mm shoulder diameter, 5 mm probe diameter, and 2 mm probe length with a 3 � recessed shoulder surface. The probe was the screw-type and the tool was not tilted. The tool rotation speed was varied between 80 and 150 rpm to control the heat input, while the traveling speed was fixed at 100 mm/min. The thermal properties of the Zr55Cu30Ni5Al10 bulk metallic glass joints were measured by differential scanning calorimetry (DSC, Bruker, DSC 3300SA) at the heating rate of 20 K/min in an flowing Ar gas atmosphere. The phase identification and microstructures of the specimens were examined by X-ray diffraction (XRD) and transmission electron microscopy (TEM). The XRD analysis was con(d)
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