Friction welding of bulk metallic glasses to different ones

For application of bulk metallic glasses (BMGs) as industrial materials, it is necessary to establish the metallurgical bonding technology. The BMGs exhibit high-strain-rate superplasticity in the supercooled liquid state. It has been reported that bulk metallic glasses were successfully welded together by friction, pulse–current, explosion and electron-beam methods. In this study, friction welding of the BMGs to different ones were tried for Pd40Ni40P20, Pd40Cu30P20Ni10, Zr55Cu30Al10Ni5 and Zr41Be23Ti14Cu12Ni10 BMGs. Successful welding was obtained in the combinations of the Pd40Ni40P20 and Pd40Cu30P20Ni10 BMGs, and the Zr55Cu30Al10Ni5 and Zr41Be23Ti14Cu12Ni10 ones. No crystallization was observed and no visible defect was recognized in the interface. The joining strength of the welded BMGs was the same as that of the parent BMG or more. BMGs seem to be successfully welded to the different ones with a difference below about 50 K in glass transition temperature.