快淬Fe85Ga15薄带的微观结构和磁致伸缩性能研究  

Microstructure and maganetostrictive properties of Fe_(85)Ga_(15) ribbons

作　　者：刘昊[1] 王海欧[1] 曹梦雄[1] 谭伟石[1] 时阳光[2] 陈雨[3] 黄宇营[4] 

机构地区：[1]南京理工大学理学院应用物理系,南京210094 [2]南京航空航天大学理学院应用物理系,南京210093 [3]中国科学院高能物理研究所,北京100049 [4]中国科学院上海应用物理研究所,张江园区上海201204

出　　处：《核技术》2013年第3期5-9,共5页Nuclear Techniques

基　　金：国家自然科学基金(批准号:11079022)资助

摘　　要：为研究Fe-Ga合金微结构对磁致伸缩效应的影响,测量了Fe85Ga15合金铸态和不同甩速下制备的薄带的相结构、局域结构和磁致伸缩性能。X射线衍射结果表明合金铸态保持无序的BCC结构,在甩带样品以及退火态样品中都探测到了修正的DO3相。X射线衍射和扩展X射线吸收精细结构谱的结果共同说明Ga原子沿着[100]方向次近邻分布。1000℃退火态样品中析出的少量DO3相使磁致伸缩系数降低。较大的甩速使得合金中产生较多的修正的DO3相,从而提高了样品的磁致伸缩系数。Background： Fe-Ga alloy is a new magnetostrictive material of lower price and better extensibility in comparison with conventional Tb-Dy-Fe alloys. Many researches revealed that the microstructure and magnetostriction are influenced by preparing method and heat treatment. Purpose： In order to study the influence of microstructure on magnetostrctive properties of Fe-Ga alloy, the phase structures, local structure and magnetostrictive properties of Fe85Ga15 ribbons prepared by different wheel speed was studied. Methods： We utilized high resolution x-ray diffraction （HRXRD） to characterize the phase structure and used Extend X-ray absorption fine structure （EXAFS） to study the local structure of the ribbons in Synchrotron Radiation Facility. Results： X-ray diffraction showed that only disordered BCC phase was observed in as-cast Fe85Ga15 alloy. Modified-DO3 phase were detected in all of the melt spun samples. Both the HRXRD and EXAFS results indicated that Ga atoms were located as second-nearest neighbour along [100] orientation. A little DO3 phase was found in ribbons annealed at 1000℃ under Ar atmosphere. Conclusions： Higher wheel speed will generate more modified-DO3 phase which will enhance the magnetostriction. DO3 phase in the anne.aling sample will deteriorate the magnetostrictive properties of Fe-Ga ribbons.

关 键 词：FE-GA合金 微观结构 修正的DO3相 磁致伸缩 

分 类 号：TG113.12[金属学及工艺—物理冶金] O482.526[金属学及工艺—金属学]