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.
出处
《核技术》
CAS
CSCD
北大核心
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
