Friction Stir Welding of Zr₅₅Cu₃₀Ni₅Al₁₀ Bulk Metallic Glass

Abstract

A Zr₅₅Cu₃₀Ni₅Al₁₀ bulk metallic glass plate was successfully welded below its crystallization temperature by friction stir welding. The flash formation and heat concentration at the shoulder edge was minimized using a wider tool with the shoulder surface recessed by an angle of 3°. To evaluate the crystallization of the weld, the microstructure and mechanical properties were analyzed using DSC, XRD, TEM, and micro-hardness. As a result, it was found that the amorphous structure and original mechanical properties were maintained throughout the entire joint.