Fe100-x（Ga0.75Al0.25x（21．2≤x≤26．8）合金的结构与磁性  

Structure and magnetic properties of Fe100-x（Ga0.75Al0.25x（21.2≤x≤26.8） alloys

作　　者：周严[1,2] 王博文[1,3] 李淑英[1] 黄文美[1] 曹淑英[1] 

机构地区：[1]河北工业大学磁技术与磁材料研究中心,天津300130 [2]天津商业大学理学院,天津300134 [3]中国科学院国际材料物理中心,辽宁沈阳110015

出　　处：《功能材料》2007年第A03期1121-1123,共3页Journal of Functional Materials

基　　金：国家自然科学基金资助项目（50571034）.

摘　　要：采用X射线衍射仪（XRD）对Fe100-x（Ga0.75Al0.25x（21．2≤x≤26．8）合金的相组成和晶格常数进行分析，表明晶格常数随Ga、Al替代量的增加而变化，反映了合金中A2相的减少和B2、D03有序相的增加。在差热分析仪（DTA）上测得Fe100-x（Ga0.75Al0.25x（x=25．2）合金样品的DTA曲线。研究发现Fe100-x（Ga0.75Al0.25x（21．2≤X≤26．8）合金经650℃均匀化退火处理后，当X≤22．8时为无序的体心立方结构A2相。当x=25．2时，合金为B2单相结构。当x=26．8时，合金的组织基本为DO3单相。采用振动样品磁强计（VSM）对此系列合金的磁性进行研究。研究发现其饱和磁化强度表现出先减小后增大的变化规律，这是该系列合金中有序相的存在引起的。分析认为晶格常数与饱和磁化强度的变化与合金磁致伸缩改变存在必然联系。The phase structure and lattice parameters of the Fe100-x（Ga0.75Al0.25x（21.2≤x≤26.8） alloys were analyzed by XRD method. The results indicate that lattice parameter changes by substitution of Ga and A1 atoms increasing, which reflects A2 phase decreasing and B2 and DO3 phases increasing. DTA curves of Fe100-x（Ga0.75Al0.25x（x=25.2） alloy were obtained by differential thermal analyzer. It was found that the alloys were disordered BCC A2 phase, B2 single phase and DO3 single phase when x≤22.8, x=25.2 and x=26.8 respectively. The magnetic properties of the alloys were investigated by VSM. The result shows that the saturated magnetization decreases with substitution x increasing below 25.2, and then increases with the further increase of substitution x, which relates to the presence of the ordered phases in the alloys. We considered that there are some relations among the lattice parameter, saturated magnetization and magnetostriction.

关 键 词：Fe100-x(Ga0.75Al0.25x 合金 微结构 饱和磁化强度 

分 类 号：TG132[一般工业技术—材料科学与工程] TG146[金属学及工艺—合金]