High performance Cu-Fe alloy thin strip and its short process preparation technology
SUN Wenbo
WU Shirui
WU Tianmo
ZHANG Yuanxiang
YUAN Guo
Abstract：In order to solve such problems as gravity stratification in the conventional preparation process of Cu-Fe alloys,the strip cast-rolling process featuring the sub-rapid solidification characteristics was employed in this study to suppress the liquid phase separation.Through the coupling of Marangoni effect and thermophoretic force,the experimental parameters were adjusted in strip cast-rolling accordingly to obtain the 2.2～2.4 mm thin strips containing Cu-20%Fe and Cu-30%Fe with controllable ferromagnetic phase size and distribution.Metallographic and EBSD analysis confirms that the cast strip forms a"sandwich"layered composite structure composed of Cu phase-Fe-rich phase-Cu phase,and Fe phase was distributed in the Cu-20%Fe cast strip more uniformly.The EBSD analysis further shows that many low-energy grain boundaries,such as Σ1 and Σ3,etc.,are formed in the solidified layer.The Cu-20%Fe alloy was rolled from 2.4 mm to 0.4 mm,and consecutively rolled to 0.12 mm after heat treatment at different temperatures.Results show that the performance of the rolled plate subjected to the heat treatment at 450℃is better,with its IACS reaching 50%at least,tensile strength higher than 600 MPa,uniform elongation reaching 7.5%,and the saturated magnetization above 4.24×105 A/m.
Keywords：Cu-Fe alloythin stripmetastable liquid phase separationtwin-roll cast-rollingsub-rapid solidificationMarangoni migrationlow-energy grain boundaryΣ3 grain boundary
Publication Date：2024-07-25
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：6( 403-408 )