Development of new-type metallic glasses by using multi-step liquid phase separation

采用单辊熔融纺丝法制备了Co-Si-B-Cu合金双层带材。衬底表面由co - si -b基非晶相和Cu纳米级微球组成，自由表面为薄晶Cu层。通过co - cu基合金体系液相分离和Co-Si-B合金层非晶相形成的同时发生，获得了宏观分离的独特结构。采用电弧熔体萃取法在Fe-Si-B-Cu合金中制备了具有宏观分离组织的快速凝固线材。在热熔体快速淬火过程中，通过液相分离形成了由Fe-Si-B非晶基合金芯和Cu晶芯组成的独特的芯-线/表面-覆盖层结构。

A dual-layer ribbon of Co-Si-B-Cu alloy was prepared by the single-roller melt-spinning method. The substrate surface comprised Co-Si-B-based amorphous phase with Cu crystalline nanoscale globules, while the free surface showed a thin crystalline Cu layer . A macroscopically separated unique structure was obtained by the simultaneous occurrence of liquid phase separation of the Co-Cu-based alloy system and amorphous phase formation in the Co-Si-B alloy layer. Rapidly-solidified wire with macroscopically separated structure was formed in Fe-Si-B-Cu alloy by Arc-melt-type melt-extraction method. Unique core-wire / surface-cover-layer structure composed with core Fe-Si-B amorphous based alloy and cover Cu crystal was formed through liquid phase separation during rapid quenching of thermal melt.