Solute redistribution during phase separation of ternary Fe–Cu–Si alloy

Abstract

Ternary Fe 48 Cu 48 Si 4 immiscible alloy was rapidly solidified under the containerless microgravity condition inside a drop tube. Liquid phase separation took place in the alloy melt and led to the formation of various segregated structures. The core-shell structure consisting of Fe-rich and Cu-rich zones and the homogenously dispersed structure were the major structural morphologies. Phase field simulation results revealed that the two-layer core-shell was the final structure of liquid phase separation. The solute redistribution of liquid Fe 48 Cu 48 Si 4 alloy experienced the macroscopic solute distribution induced by liquid phase separation, the secondary phase separation within the separated liquid phases and the solute trapping during rapid solidification. Energy dispersive spectroscopy analysis showed that the solute Si was enriched in the Ferich zone whereas depleted in the Cu-rich zone. In addition, both aFe and (Cu) phases in the Fe-rich zone exhibited a conspicuous solute trapping effect. As compared with (Cu) phase, aFe phase had a stronger affinity with solute Si.

Enhancing Surface Properties of Cu-Fe-Cr Alloys through Laser Cladding: The Role of Mo and B4C Additives

“…Luo examined the rapid solidification of the Fe 48 Cu 48 Si 4 immiscible alloy under microgravity conditions. He noted that the two layers of nucleoshells represent the ultimate configuration for the liquid phase separation [2]. Numerous researchers have employed the microgravity approach to create liquid-phase immiscible alloys, including Wang [3,4], Xia [5], and Zhao [6].…”

Microstructure Formation and Nanoindentation Behavior of Rapidly Solidified Cu-Fe-Zr Immiscible Alloys

“…For some ternary Cu-Fe-X (X = Pb, Si, C, etc.) systems [7,8], the third addition can enhance the LLPS. In contrast, a metastable LLPS into Fe-rich and Cu-rich liquids was examined for the Cu-Fe-Z (Z = Ni, Co, Cr, Mn, etc.)…”