高性能Cu-Fe合金薄带材及其短流程制备技术  

High performance Cu-Fe alloy thin strip and its short process preparation technology

作　　者：孙文博 吴诗睿 吴天模 张元祥[1] 袁国[1] SUN Wenbo;WU Shirui;WU Tianmo;ZHANG Yuanxiang;YUAN Guo(State Key Laboratory of Rolling and Automation(RAL),Northeastern University,Shenyang 110819,Liaoning,China)

机构地区：[1]东北大学轧制技术及连轧自动化国家重点实验室,辽宁沈阳110819

出　　处：《沈阳工业大学学报》2024年第4期403-408,共6页Journal of Shenyang University of Technology

基　　金：科技部重点研发计划项目(2018YFE0306102);东北大学大学生创新创业训练创新项目(10414425)。

摘　　要：为了解决Cu-Fe合金常规制备流程中重力分层的问题,利用铸轧工艺的亚快速凝固特点抑制其液相分离,并结合Marangoni效应及热泳力的耦合作用合理调控铸轧参数,获得厚度为2.2~2.4 mm、铁磁相尺寸和分布可控的Cu-20%Fe和Cu-30%Fe带材。通过金相与EBSD分析确定铸带形成了Cu相-富Fe相-Cu相的“三明治”层状复合结构,其中Cu-20%Fe铸带中的Fe相分布更为均匀,且EBSD分析结果表明凝固层中形成了大量的低能晶界,如Σ1和Σ3等。将Cu-20%Fe合金从2.4 mm冷轧至0.4 mm,在不同温度下进行热处理后继续冷轧至0.12 mm。结果表明:450℃热处理对轧板性能更好,导电率超过50%IACS,抗拉强度超过600 MPa,均匀伸长率达到7.5%,饱和磁化强度超过4.24×10^(5)A/m。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 asΣ1 andΣ3,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 4.24×10^(5)A/m.

关 键 词：CU-FE合金 薄带材 亚稳液相分离 双辊铸轧 亚快速凝固 Marangoni迁移 低能晶界 Σ3晶界 

分 类 号：TG146[一般工业技术—材料科学与工程]