Microstructure And Properties Of Fe-ga-er Magnetostrictive Alloy

As a new type of magnetostrictive material, Fe-Ga alloy is a new important finding inmagnetorictive field in recent years. It has new features better than the rare earth giantmagnetostrictive material and the traditional magnetostrictive materials, such as biggermagnetostrictive coefficient, smaller saturated magnetic field, higher mechanical strength, bettertemperature properties, lower price. This kind of alloy attracted the interest of the people inapplication of the drive, sensor and transducer, which has great potential application value. Thispaper studied the microstructure, magnetostrictive performance and the hardness of theFe83Ga17Erx(x=0,0.2,0.4,0.6,0.8) series alloys with as-cast, hot rolling state and afterannealing treatment. The experimental results as follows:The adding of rare earth Er did not change the basic structure of the Fe83Ga17Erxalloywhich keeps the original structure of bcc. Adding rare earth Er makes the saturatedmagnetostrictive coefficient increases significantly of the alloy as-cast Fe83Ga17Erxin which thesaturation magnetostriction coefficient of Fe83Ga17Er0.6can make up to125ppm. This kind ofsaturated magnetostrictive coefficient significantly improve has mater with the including oferbium D03phase, and the increase of preferred orientation on the <100> crystal phase. The as-cast Fe83Ga17Erxalloy phase composition is given priority to with A2phase, Rare earth Er hasnot entered in the crystal lattice of the A2phase. But enriched in the erbium D03phase of thegrain boundary. Studies have shown that the Magnetic scalability of the alloy sample afterheat treatment has slightly improve, but the degree of improved does not much. The vickershardness of alloy before and after heat treatment were the similar trends with the increase thendecreasesofErcontent.The phase in Fe83Ga17Erxof hot rolling state is given priority to with A2phase, and there issome phases enriched with the erbium D03. The scalability of alloy after different treatmentshow different changes. The untreated magnetostrictive coefficient betweens20~40ppm.The furnace cooling off makes the magnetic scalability fall, expect the higher performance ofFe83Ga17Er0.2alloy after fumace cooling treatment was37ppm, other all around25ppm. The magnetostrictive coefficient after quenching treatment is significantly increase, which improveto32ppm~57ppm. The grain shape and orientation are different, after different heattreatment conditions. The crystal of hot rolling state alloy beforce heat treatment is longcylindrical in shape and growth direction has a certain direction. Crystal become isometriccrystal after heat treatment. By energy spectrum analysis, the white reticulation within thecrystal boundary is rich in Er, which is thought is phase of rich Er in primary.