Multiscale influence of trace Tb addition on the magnetostriction and ductility of 〈 100 〉 oriented directionally solidified Fe-Ga crystals

摘要: New-generation magnetostrictive applications in micromanipulation instruments, torque sensing, and transducers require materials that offer a combination of large magnetostriction good structural properties. $\mathrm{F}{\mathrm{e}}_{100\ensuremath{-}x}\mathrm{G}{\mathrm{a}}_{x}\text{-based}\phantom{\rule{4pt}{0ex}}(x=17--19)$ alloys are potential candidates. In this work, the solidification behavior Tb-doped FeGa is investigated by theoretical simulation experimental observation; directional parameters optimized to obtain largest solid solubility Tb while keeping $\ensuremath{\langle}100\ensuremath{\rangle}$ preferred orientation. The multiscale evolution structure with additions enhances both tensile properties systematically studied prepared under optimal conditions. Magnetostriction 387 ppm accompanied remarkable fracture strain 12.5% 0.05 at.% ${\mathrm{Fe}}_{81}{\mathrm{Ga}}_{19}$. values represent an improvement $\ensuremath{\sim}29%$ sixfold enhancement compared undoped binary increase attributed higher density tetragonally modified $\mathrm{D}{0}_{3}$ nanoinclusions induced traces Tb. ductility explained dislocation concentration around submicron-scale Tb-rich precipitates which can effectively hinder their motion. doped be easily processed thin sheets or wires likely extensively applied because they contain only rare earths.