(河北科技大學(xué) 材料科學(xué)與工程學(xué)院，石家莊 050054)
摘 要: 以Cu-Fe-Cr原位復(fù)合絲材萃取得微米級、 亞微米級的Fe-Cr纖維， 并研究了變形量、 長期儲存條件和熱處理對Fe-Cr纖維樣品結(jié)構(gòu)和磁性能的影響。采用X射線衍射(XRD)和掃描電鏡(SEM)分析了樣品的結(jié)構(gòu)和形貌， 采用振動樣品磁強(qiáng)計(VSM)測試了樣品的磁性，并利用熱重-差熱分析(TGA-DTA)比較了不同變形量的Fe-Cr纖維在空氣中的熱穩(wěn)定性。 結(jié)果表明： 隨著變形量的增大和Fe-Cr纖維的細(xì)化，纖維的飽和磁矩基本恒定(約140 A·m2/kg)，而剩磁和矯頑力則逐漸增加； Fe-Cr纖維在無水乙醇和空氣中儲存一年以上， 磁性基本保持不變； Fe-Cr纖維在空氣中經(jīng)300 ℃以上加熱1 h后， 逐漸由鐵磁性的α-(Fe， Cr) (BCC結(jié)構(gòu))固溶體轉(zhuǎn)變?yōu)轫槾判缘?Fe， Cr)2O3(六角晶系)， 飽和磁化強(qiáng)度顯著下降； 且隨著變形量的增大， 較細(xì)Fe-Cr纖維的熱穩(wěn)定性較差。
關(guān)鍵字: Fe-Cr纖維； 變形量； 長期穩(wěn)定性； 熱穩(wěn)定性； 磁性
magnetic Fe-Cr fibers
（ School of Materials Science and Engineering,
Hebei University of Science and Technology, Shijiazhuang 050054， China）
Abstract: The micron and sub-micron Fe-Cr fibers were extracted from Cu-Fe-Cr in situ composite wires.The effects of deformation strain, long-term preservation condition and heat treatment on structure and magnetic properties of Fe-Cr fibers samples were investigated.The structures and morphologies of samples were analyzed by XRD and SEM, respectively， and the magnetic properties of samples were measured by vibrating sample magnetometer (VSM).The thermal stabilities of Fe-Cr fibers at different deformation strains were compared by TGA-DTA in air. The results show that with the increase of deformation strains and thinning of Fe-Cr fibers， the saturation magnetization are about 140 A·m2/kg constantly， and the remanent magnetism and coercivity increase gradually.The magnetic properties of Fe-Cr fibers are invariant when the Fe-Cr fibers were preserved in absolute alcohol or air for more than 1 a. After Fe-Cr fibers heated in air at temperature higher than 300 ℃ for 1 h， the Fe-Cr fibers transform from ferromagnetic α-(Fe， Cr)(BCC structure)solution to paramagnetic (Fe，Cr)2O3 (hexagonal structure), and the saturation magnetization of samples decreases remarkably. With the increase of deformation strains， the thermal stability of thinner Fe-Cr fibers decreases.
Key words: Fe-Cr fiber； deformation strain； long-term stability； thermal stability； magnetic properties
