中文摘要：

通过调控冷轧压下率，在退火后获得3种不同的Fe81Ga19二元合金初次再结晶状态，采用XRD和EBSD宏微观织构分析技术研究了初次再结晶状态对高温退火后晶粒尺寸及织构的影响。结果表明：初次再结晶阶段形成更多的大尺寸卵（〈001〉／／RD）取向晶粒，有利于后续高温退火过程中的叩取向晶粒择优长大甚至发生异常长大，最终在晶粒尺寸相对较小的再结晶组织中获得强叩织构，饱和磁致伸缩系数可达到220×10-6。

英文摘要：

Fe-Ga alloys are attractive magnetostrictive materials due to large magnetostriction along 〈100〉 direction and high mechanical strength. However, sharp Goss （{110}〈001〉） texture and large mag- netostriction coefficients were conventionally achieved by secondary recrystallization with centimeter- sized grains under the effects of inhibitor and surface energy, resulting in deteriorated mechanical proper- ties. Texture optimization in relatively fine grained micrestructure is an effective way to obtain excellent comprehensive properties. Cold rolling process can determine the difference in number and size of prima- ry recrystallization grains among various texture components, and further influence the texture and grain size evolution during subsequent high temperature annealing. The present work aims to produce strong q texture （〈001〉//RD, rolling direction）in binary Fe-Ga sheet with relatively fine recrystallization grains by cold rolling parameter modification. Macro- and micro-texture analysis was applied to investigate the ef- fects of primary recrystallization states on texture and grain size evolution during high temperature an- nealing in binary Fe-Ga sheet. The η grains can gain more numbers and relatively larger sizes in primary recrystallization stage, and preferably grow even abnormally during high temperature annealing. A sharp η texture and large magnetostriction coefficient are successfully developed in primarily and secondarily recrystallized sheets with relatively fine grains. The results provide a prospective route for the efficient re- crystallization texture and grain size optimization in binary Fe-Ga and other bcc alloys.