Effect Of Nd And Tb On The Properties Of Fe-Ga Magnetostrictive Alloy

As a new type of magnetostrictive material,Fe-Ga alloy has great advantages over traditional rare earth giant magnetostrictive alloy(Terfenol-D).It has low saturation magnetic field,good processing performance,wide applicable temperature range and low price.Only 1/3 of Terfenol-D.In order to further explore the properties of Fe-Ga alloy,find out the special properties,formation mechanism and other related physical properties of the alloy,and try to improve some of its application properties,we have done the following research work.The development and application of Fe-Ga alloy and the basis of magnetostriction are briefly introduced in this paper.In theory,the magnetostrictive coefficient,saturation magnetization intensity,Vickers hardness and so on of binary Fe100-xGax alloy,Fe100-xGax alloy and ternary Fe100-xGax alloy have been analyzed in detail,such as magnetostriction coefficient and Vickers hardness.Through the analysis of the samples,we find that the structure of Fe-Ga alloy is disordered BCC structure,the Ga atom is filled in the direction of(110)when the Ga atom is doped,and the direction is saturated when the content of Ga is 18 at%.At the same time,the addition of Ga atoms began to fill in the direction of(200)to destroy the internal structure of the lattice,and the internal defects of the alloy first decreased and then increased,and there were many vacancy defects in the alloy.The size of the open space defect is larger than that of the single vacancy,and with the increase of Ga content,the open space defect decreases gradually,and the number of open space defects in the sample is more than that in the open space.The magnetostrictive coefficient of Fe-Ga alloy increases first and then decreases with the increase of Ga content,and the saturation magnetization decreases first and then increases to 18%.The lower the saturation magnetization of the alloy is,the lower the magnetostriction coefficient is.The larger the magnetostrictive coefficient is,the more obvious the hardness of the alloy is with the increase of Ga content,but the overall increasing trend.The Vickers hardness of the alloy has little difference when the Ga content reaches 20 at%.The Vickers hardness increased obviously when Ga concentration reached 20at%.The results show that the magnetostriction of Fe-Ga alloy can be improved by adding the third element.In this paper,the effects of Tb and Nd on the phase structure,magnetostrictive properties and Vickers hardness of Fe-Ga alloy are selected.The addition of element Nd does not change the phase structure of the matrix.The alloy is disordered BCC structure,but the magnetostrictive coefficient of the alloy is higher than that of Fe82Ga18 alloy.However,with the increase of Nd element,Fe(82-x)Ga18Ndx(x=2?4?6)The magnetostrictive coefficient of alloy increases first and then decreases.The saturation magnetization of Fe80Ga18Nd2 alloy is obviously lower than that of Fe82Ga18 alloy.The Vickers hardness of Fe78Ga18Nd4 alloy is higher than that of Fe82Ga18 alloy.The addition of Tb is the second rare earth element doped in this paper.The addition of the same Tb does not change the phase structure of the matrix,and the sample is still disordered BCC structure.It was found that the magnetostrictive coefficient of the sample was not increased after adding rare earth element Tb,but the saturation magnetization of Fe76Ga18Tb6 alloy increased first and then decreased.The saturation magnetization of Fe78Ga18Tb4 alloy decreased obviously.The hardness of Fe78Ga18Tb4 alloy is the largest after adding Tb.