Behavior and mechanism of internal friction peak in quenched Fe-18 at.% Ga alloy

摘要: Abstract Quenched Fe-18 at.% Ga with high magnetostrictive properties has a peak (Pwq) in temperature-dependent internal friction (IF) spectrum near 320 °C, which disappears for both as-cast and furnace-cooled alloys. However, the mechanism of this is not well understood. In investigation, behavior were systematically studied. It found that Pwq appears when sample quenched from temperature higher than critical order-disorder phase transition annealed at 300 °C 1 h. The becomes gradually more apparent as content increases below ~18 at.%, almost equals 23 at%. Combined deformation XRD studies, does originate vacancies dislocations produced by high-temperature quenching process or D03 to L12, potential formation mechanisms may Ga-rich Guinier-Preston (GP) zones structures lattice relaxation related GP zones.