Formation of Various Types of Globules in Co–Cu–Si–B Immiscible Alloy with Amorphous Phase

Abstract

The formation of globules with a Co–Si–B-based amorphous core and Co–Si-based nanocrystalline shell structure embedded in the Cu crystalline matrix phase was found in rapidly solidified (Co_0.75Si_0.10B_0.15)₇₀Cu₃₀ alloy. Liquid phase separation based on the Co–Cu alloy system and the high glass-forming ability of the Co–Si–B alloy system led to the formation of various types of globules in Co–Cu–Si–B immiscible alloy with an amorphous phase.