摘要
采用光学显微镜、电子探针分析、X射线衍射仪、相图计算、万能力学试验机、振动试样磁强计测试等手段,研究了Si对Cu-10Fe(质量分数,%)合金组织、凝固行为与力学性能和软磁性能的影响。结果表明,随着Si含量从0增加到2%,富Fe相含量由7.39%提升至9.27%。同时,富Fe相枝晶生长被抑制,由发达树枝晶转变为形状各向异性更低的胞状枝晶形貌,软磁性能提升。结合相图计算发现,随着Si的加入,Cu-Fe难混溶区的面积不断扩大,表明合金液-液相分离越发明显,富Fe相在凝固过程中碰撞、聚集导致组织均匀性与力学性能先提升后下降。铸态Cu-10Fe-1Si合金具有理想的综合性能,其抗拉强度与饱和磁化强度分别为338.7 MPa、17.28 emu/g,与Cu-10Fe合金相比分别提升了11.3%与21.9%;而矫顽力为13.75 Oe,相较于Cu-10Fe合金降低了49.9%。
Effects of Si on microstructure,solidification behavior,mechanical and soft magnetic properties of Cu-10Fe alloy were investigated by optical microscope,electron probe analysis,X-ray diffractometer,phase diagram calcula⁃tion,universal mechanical testing machine and vibrating sample magnetometer.The results indicate that with the increase of Si content from 0 to 2%,the mass fraction of Fe-rich phase is increased from 7.39%to 9.27%.Meanwhile,the growth of Fe-rich dendrites is inhibited,which is transformed from developed dendrites to cellular dendrite mor⁃phology with lower shape anisotropy,resulting in the enhancement of soft magnetic properties.The calculation of phase diagram reveals that the area of immiscible region continues to expand with Si addition,indicating the significant liquid-liquid phase separation.Fe-rich phase collides and aggregates during the solidification process,leading to the increase firstly and then decrease of microstructure uniformity and properties.The as-cast Cu-10Fe-1Si alloy exhibits the optimal comprehensive performance,where the tensile strength and saturation magnetization are 338.7 MPa and 17.28 emu/g,respectively,which are 11.3%and 21.9%higher than those of Cu-10Fe alloy.The coercivity is 13.75 Oe,which is 49.9%lower than that of Cu-10Fe alloy.
作者
张宇博
陈佳乐
接金川
李廷举
ZHANG Yubo;CHEN Jiale;JIE Jinchuan;LI Tingju(School of Materials Science and Engineering,Dalian University of Technology,Dalian 116024;Liaoning Key Laboratory of Solidification Control and Digital Preparation Technology,Dalian 116024)
出处
《特种铸造及有色合金》
CAS
北大核心
2024年第6期721-728,共8页
Special Casting & Nonferrous Alloys
基金
国家自然科学基金资助项目(52171135)
国家重点研发计划资助项目(2018YFE0306103)。
