Galfenol合金的显微组织和磁致伸缩性能  

Microstructure and Magnetostriction of Galfenol Alloy

作　　者：胡勇[1] 丁雨田[1] 刘芬霞[1] 张艳龙[1] 王璟[1] 

机构地区：[1]兰州理工大学甘肃省有色金属新材料省部共建国家重点实验室,甘肃兰州730050

出　　处：《铸造技术》2008年第11期1579-1583,共5页Foundry Technology

摘　　要：采用非自耗真空电弧熔炼方式制备了不同Ga含量条件下的Fe100-XGaX(X=16、19、21、27)合金铸锭,系统研究了不同成分合金铸锭的显微组织结构和磁致伸缩性能。结果发现,铸态Fe-Ga合金室温基本结构为无序的bcc结构,随着Ga原子含量的增加,立方晶格的晶格常数逐渐增加。富Ga相的数量和分布直接影响着铸态合金的磁致伸缩性能,Fe81Ga19合金的饱和磁致伸缩最大,达到93×10-6,Fe79Ga21合金由于在26.64°附近存在(111)面有序DO3相的析出,进一步抑制了磁致伸缩性能的提高,其饱和磁致伸缩最小只有20×10-6。铸态多晶Fe84Ga16合金沿〈110〉方向具有一定的择优取向,因偏离〈100〉易磁化方向,因此其磁致伸缩系数较低。The ingots of Fe100-X Gax （X = 16,19,21,27） were prepared using vacuum arc melting, and the microstructure and magnetostriction were systematially investigated. It is found that the microstructure of as-cast Fe-Ga alloys exhibits A2 as the main phase, while the crystal lattice constant increase with the Ga content. The volume fraction and distribution of Ga-rich phase directly affect the magnetostriction. Fe81 Ga19 alloy has the largest saturation magnetostriction, which can reach up to 93 × 10^-6, however the saturation magnetostriction of Fe79Ga21 alloy is 20 × 10^-6 , which result from the precipitation of ordered DO3 phase near （111） and restrict the improvement of magnetostriction. As-cast multi-crystalline Fe84 Ga16 alloy present a preferred orientation along the 〈110〉 direction, which deviates from the easy magnetization orientation of 〈100〉, thus has a lower magnetostriction.

关 键 词：Calfenol合金 微观结构 富Ga相 DO3相 磁致伸缩 

分 类 号：TG136.1[一般工业技术—材料科学与工程]