Secondary recrystallization behavior in magnetostrictive Fe-Ga thin sheets induced by nano-sized composite precipitates

摘要: Strengthening η texture (⟨001⟩//rolling direction) through secondary recrystallization can significantly improve the magnetostriction coefficient of Fe-Ga thin sheets and expand use alloys in high-frequency applications. However, Goss deteriorates with thinning sheet thickness under current inhibitors micron-sized NbC particles or precipitates. In this paper, a new composite inhibitor system, composed nano-sized MnS Nb(C,N) precipitates, is proposed to induce thicknesses less than 0.3 mm. The density size designed based on effect alloy composition hot rolling parameters precipitation kinetics Nb(C,N), including relative nucleation rate-temperature (NrT) precipitation-time-temperature (PTT) curves. It found that stored deformation energy increases maximum rate fastest temperature. A large number lamellar rectangular precipitates (MnS Nb(C,N)) 5∼20 nm were precipitated after hot-rolling at temperature 800∼1,050 °C total reduction 80%. These provide strong pinning for primary recrystallized grains, abnormal grain growth grains an annealing 950∼1,050 °C. Resultingly, centimeter-sized small deviation angle 264 ppm are successfully achieved 0.25 mm.