系统研究了室温下Tb0 .3 Dy0 .7(Fe1 -xAlx) 1 .95(x=0 ,0 .0 5 ,0 .1,0 .15 ,0 .2 ,0 .2 5 ,0 .3,0 .35 )合金中金属Al替代Fe对晶体结构、磁致伸缩、各向异性和自旋重取向的影响 .结果发现 ,x <0 .4时 ,Tb0 .3 Dy0 .7(Fe1 -xAlx) 1 .95完全保持MgCl2立方Laves相结构 ,晶格常量a随Al含量x的增加而增大 .磁致伸缩测量发现 ,随着替代量x的增多磁致伸缩减小 ,x >0 .15时超磁致伸缩效应消失 ;x <0 .15时磁致伸缩在低场下 (H≤ 4kA m)有小幅增加 ,高场下迅速减小 ,而且易趋于饱和 ,说明添加少量Al有助于减小磁晶各向异性 .内禀磁致伸缩λ1 1 1 随Al替代量x的增加大幅度降低 .对于 0≤x <0 .15 ,穆斯堡尔效应表明 ,随Al含量的增加Tb0 .3 Dy0 .7(Fe1 -xAlx) 1 .95合金中发生了自旋重取向 ,易磁化方向经历了 [111]→ [uv 0 ]→ [uvw]的转变 .由相对磁化率随温度的变化关系可以看出 ,Al替代Fe使自旋重取向温度降低 .当x =0 .15时 ,Tb0 .3 Dy0 .7(Fe1 -xAlx) 1 .95合金中出现了少量非磁性相 ;x>0 .15时 ,合金在室温下呈现顺磁性 The effect of Tb0 .3 Dy0 .7 (Fe1-x Alx) 1 .95 (x = 0,0.5,0.1,0,15,2.2,0.25, 0.3, 0 .35) The effect of metal Al substitution for Fe on the crystal structure, magnetostriction, anisotropy and spin reorientation was investigated. It was found that when Tb0.3 Dy0.7 (Fe1-x Alx) 1.95 completely retained MgCl 2 cubic Laves phase structure, the lattice constant a increases with the increase of Al content, the magnetostriction measurement shows that the magnetostriction decreases with the increase of substitution amount x, when x> 0.15 Magnetostriction at x <0 .15 slightly increases at low field (H≤4kA m), decreases rapidly at high field and tends to be saturated, indicating that the addition of a small amount of Al helps Decreases the magnetocrystalline anisotropy.The intrinsic magnetostriction λ1 1 1 greatly decreases with the increase of Al substitution amount x. For 0≤x <0.15, the Mossbauer effect shows that Tb0 increases with the Al content. The spin reorientation occurred in the Dy0.7 (Fe1-xAlx) 1.95 alloy, and the direction of easy magnetization changed from [111] → [uv 0] → [uvw] .The relationship between relative susceptibility and temperature It can be seen that substitution of Fe for Al decreases the spin reorientation temperature.When x = 0.15, Tb0 .3 Dy0 .7 (Fe1-xAlx) 1.95 alloy appeared a small amount of non-magnetic phase; x> 0 .15, the alloy at room temperature showed paramagnetic