Effects Of The Ternary Element (C,B,Al,Cu) Additions On Phase Constitution And Magnetostriction Of Fe₈₃Ga₁₇ Alloys

As a novel magnetostrictive material,Fe-Ga alloys has a good application prospect.But the respective lower magnetostriction limited its application.As a way to improve the performance of metallic materials, adding alloying elements has been widely researched.Research results show that Fe-Ga alloy obtained under rapid solidification can improve magnetostriction property, which have random arranged Ga atoms of disorder phase structure,and crystalline grown along specific direction.This paper retain high-temperature disorder phase in room temperature by rapid solidification process.Modified cooling system allow one-way cooling during solidification,to obtain a certain direction alloy structure.Prepared (Fe83Ga17)100-xMx(x=0,0.5,1,1.5;M=C,B)and Fe83Ga17-xMx(x=0,1,2,3;M=Al,Cu) by adding C,B,Cu, Al elements. Investigated alloy modified microstructure,added atoms on phase structure and magnetostriction property.Systematically studied the microstructure and magnetostrictive properties of the Fe83Ga17 which produce by the equipment of this experiments.The bottom of the specimen obtained with a dirctional structure of columnar grain structure, measured the saturation magnetostriction value along the crystal gr-owth direction and perpendicular to the direction, the saturation magnetostriction value isλ⊥=65ppm.We found massive dislocations in the microstructure of Fe83Ga17 from the TEM,the segregation of Ga atoms in the dislocation stress field.The microstructure and magnetostriction property of these two kinds of alloys(Fe83Ga17)100-xMx(x=0,0.5,1,1.5;M=C,B)and Fe83Ga17-xMx(x=0,1, 2,3;M=Al,Cu) are investigated.Adding C,B,Cu elements, alloy's maximum saturation magnetostriction were detected along crystalline growth direction,λ∥=28 ppm of (Fe83Ga17)99C1 alloy,λ∥=53 ppm of (Fe83Ga17)98.5Bi.5 alloy, andλ∥=39 ppm of Fe83Ga17-x Cux(x=2,3)alloy. Adding Al elements,maximum saturation magnetostriction of Fe83Ga17-xAl x(x=0,1,2,3) were obtained perpendicular crystalline growth direction, whichλ⊥=44 ppm.Research on column crystalline zone of alloy found that the alloy retained disorder A2 phase structure.Compared with Fe83Ga17 alloy, adding third elements have different microstructure,no dislocation network founded.The microstructure of (Fe83Ga17)100-xBx(x=0,0.5,1,1.5) alloys had significant changes with the content of B increaseng,B elements conducive to Fe-Ga alloy was organized columnar grain.When the Cu content reaches x=2,there are facentered cubic structure of CuxFe1-x phase formation in the Fe83Ga17-xCu x(x=0,1,2,3)alloys.