Research progress on effects of rare earth doping on properties of Fe-Ga alloys
Although the saturation magnetostrictive coefficient of Fe-Ga alloys is lower than that of rare earth giant magnetostrictive material,they possess a low driving magnetic field,high tensile strength and low raw material cost,thus served as a momentous magnetic driving smart material.In recent years,researches have shown that the addition of trace rare earth elements can significantly improve the magnetostriction coefficient of Fe-Ga alloys,and simultaneously ameliorate the mechanical properties and damping properties.The investigation on the mechanism of the large magnetostrictive effects of Fe-Ga alloys caused by rare earth doping,the mechanism of strengthening the mechanical properties of the alloys,and the mechanism of enhancing the damping properties of the alloys are the cur-rent research hotspots.Therefore,the effects of rare earth elements and the preparation process on magnetostrictive properties of Fe-Ga alloys are firstly overviewed in this paper,and then the theoretical mechanism of the large mag-netostrictive effect resulted from rare earth elements doping is analyzed from the aspects of alloy phase structure and crystal orientation.Additionally,the strengthening and toughening mechanism attributed to rare earth doping is in-terpreted in detail from the second phase strengthening mechanism.Finally,the influence of rare earth element do-ping on damping performance is summarized,and the future research is prospected.
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