热处理对Fe-Cr纤维组织结构和磁性的影响  

Effects of heat treatment on structure and magnetic properties of Fe-Cr fibers

作　　者：孙世清[1] 毛磊[1] 刘宗茂[1] 孟永强[1] 

机构地区：[1]河北科技大学材料科学与工程学院,河北石家庄050054

出　　处：《材料热处理学报》2006年第6期14-17,共4页Transactions of Materials and Heat Treatment

基　　金：教育部科学技术重点研究项目(205015);河北省教育厅博士科研基金资助项目(B2004202)

摘　　要：由Cu-13Fe-2Cr原位复合丝材萃取得到微米级、亚微米级Fe-Cr纤维,研究了热处理对Fe-Cr纤维样品的结构和磁性的影响。采用X射线衍射(XRD)和扫描电镜(SEM)观察分析样品的结构和形貌,采用振动样品磁强计(VSM)测试样品的磁性,利用热重-差热分析(TGA-DTA)比较不同变形量的Fe-Cr纤维在空气中的热稳定性。结果表明,Fe-Cr纤维的饱和磁化强度约为120emu.g-1,Fe-Cr纤维在空气中经300℃以上加热1h后,逐渐由铁磁性的α-(Fe,Cr)(BCC结构)固溶体转变为顺磁性的(Fe,Cr)2O3(六方晶系),饱和磁化强度显著下降;随着变形量增大,较细的亚微米级Fe-Cr纤维的热稳定性较差。Micron and sub-micron Fe-Cr fibers were extracted from Cu-13Fe-2Cr in situ composite wires.The effects of heat treatment on structure and magnetic properties of Fe-Cr fiber samples were investigated.The structure and morphology of the samples were analyzed individually by XRD and SEM,and the magnetic properties of the samples were measured by vibrating sample magnetometer(VSM).The thermal stability of Fe-Cr fibers at different deformation strains was compared by TGA-DTA in air.The saturation magnetization of Fe-Cr fibers is about 120 emu·g -1 .After Fe-Cr fibers heated in air at higher than 300℃ for 1 hour,the saturation magnetization of samples decreases remarkably because of the transformation from ferromagnetic α-(Fe,Cr)(BCC structure)solid solution to paramagnetic (Fe,Cr)_2O_3(Hexagonal structure).With increasing deformation strains,the thermal stability of thinner Fe-Cr fibers decreases.

关 键 词：Fe-Cr纤维 变形量 热稳定性 磁性 

分 类 号：TG113.22[金属学及工艺—物理冶金]