Joining of dissimilar bulk metallic glasses with non-common supercooled liquid regions

Abstract

We first successfully joined dissimilar bulk metallic glasses with non-common supercooled liquid regions via pulse current and obtained an amorphous structure joint, which exhibits an excellent tensile shear strength of ∼ 1.7 GPa. The joining process is derived from the Lasocka equation that the glass transition temperature and crystallization temperature of bulk metallic glasses increase with the heating rate, and the supercooled liquid region shifts toward the high-temperature region simultaneously. The difference in heating rate dependence of glass transition temperature and crystallization temperature of dissimilar bulk metallic glasses can be amplified at high heating rates and overlap the originally non-overlapped supercooled liquid phase region simultaneously. Especially, a new parameter K was introduced to screen the composition combinations of dissimilar bulk metallic glasses for this method. This method is a promising candidate for scaling up metallic glass sizes, realizing the successful joining of dissimilar BMGs, and providing a new idea for manufacturing amorphous alloy components with complex performance requirements.