2005 Volume 46 Issue 12 Pages 2768-2772
The friction welding of Zr55Al10Ni5Cu30 bulk metallic glasses (BMG) has been tried. An apparatus for the friction welding of BMGs adopting a pneumatic cylinder and gripper based on a conventional lathe, and a welding process which provides a sufficient cooling rate after welding were devised. Friction time and friction pressure were chosen as the control parameters in the friction welding process. Their influences on the shape and volume of the protrusion formed from the welded interface were investigated. In addition, the temperature distribution around the interface during friction welding was measured using an infrared thermal imager. In order to characterize the friction welded interface, X-ray diffraction (XRD) and micrographic observation of welded sections were carried out. A successful joining of Zr55Al10Ni5Cu30 alloy was accomplished through the precise control of friction time and friction pressure. The condition whether crystallization occurred or not during friction welding could be classified depending upon the volume of the protrusion formed at the welded interface which is also related to the thickness of the protrusion formed at the root part of the welded interface.
