Recrystallization Texture Evolution And Properties Of Fe₈₁Ga₁₉ Alloy Sheet

As a magnetostrictive material, Fe-Ga alloy (Galfenol alloy) has been received a considerable interest. magnetic properties of Fe-Ga alloy shows significant anisotropy, magnetostriction coefficient is maximum in<100> direction. Considering the high cost of single crystal alloy preparation and the eddy current loss in high frequency condition in Fe-Ga alloy, we use the rolling process for the production of Fe-Ga alloy sheet. To realize the thin strip forming stably and control texture optimization in the rolling mode are the two key problems of production Fe-Ga alloy, which has excellent magnetostrictive properties.The rolling method is used in this study. Based on solving the cold formability, the research was focused on the effect of cold rolling ratio on primary and secondary recrystallization textures and the evolution of textures during secondary recrystallization were studied. This paper establishes an important foundation for the development of high grade Fe-Ga alloy sheet.Cold-rolled Fe81Ga19 alloy is mainly composed of the peak in{001}<110> of a texture (RD//<110>) and the peak in{111}<112> of y (ND//<111>); The Goss texture is the major in primary recrystallization texture after annealing of Fe81Ga19 alloy. It also contains small amounts of λ texture. There are obvious effects on Microstructure and texture of cold rolling reduction ratio and annealing temperature on primary recrystallization. The study found that the cold rolling reduction rate of 60-65%, it is forming strong and accurate Goss at 800-900℃. At the same time, it obtain the good magnetostrictive performance, up to 130ppm.The study use secondary recrystallization to obtain a single strong Goss texture, in order to study the microstructure and properties evolution of secondary recrystallization, and the impact of cold reduction of secondary recrystallization microstructure and properties. We found that cold reduction of 60%, with slowning heating to 1000℃ can obtains good Goss oriented grains, which saturation magnetostriction can be reached 202 ppm. It is found significant abnormal growth of Goss of cold rolling reduction rate of 70%, which gets good organization at high-temperature annealing after secondary recrystallization and gets excellent magnetostrictive properties, up to 197ppm.Thus, the present results provide a prospective route to efficiently optimize the texture of Fe-Ga alloy through reasonable rolling process flow and the annealing process.