第三组元(Al、Cu)添加对Fe_(83)Ga_(17)合金相结构和磁致伸缩性能的影响

Influence of addition of third element(Al,Cu) on phase constitution and magnetostriction of alloy Fe_(83)Ga_(17)

通过非平衡凝固方式制备Fe83Ga17-xMx(x=0、1、2、3;M=Al、Cu)合金,并对合金的相组成及其磁致伸缩性能进行研究.结果表明:合金保持A2(bcc-Fe(Ga))相结构,Al、Cu均固溶于Fe-Ga合金,添加的Al优先存在于Ga-Ga团簇当中,并与Fe形成bcc结构的Fe-Al固溶体;随着添加量的增大,Cu从基体中析出,并在晶界处富集.Al和Cu均对Fe83Ga17合金磁致伸缩性能产生抑制作用,Cu的抑制作用要小于Al.对于Fe83Ga17-xAlx合金,当x=2时,饱和磁致伸缩值达到最大;添加Cu的试样中,当x=2、3时,饱和磁致伸缩值均达到最大.

Ternary alloys Fe83Ga17-xMx（x=0,1,2,3;M=Cu or Al） were prepared by nonequilibrium solidification and their phase composition and magnetostriction were investigated by means of TEM,EDS,XRD,and resistance wire strain gauge.The result showed that alloys kept the disordered A2（bcc-Fe（Ga））structure.Al or Cu was present in solid solution in Fe-Ga alloys.Al existed in the Ga-Ga clusters preferentially and formed Fe-Al solid solution with the Fe in the form of disorder bcc crystal structure.With the addition increasing,Cu phase precipitated from the matrix and accumulated at the grain boundary.Al and Cu additions resulted in the restraint of magnetostriction of alloy Fe83Ga17,but the restraining effect of Cu-addition was less than that of Al-addition.When x=2,the alloy Fe83Ga17-xAlx would reach its maximum magnetostriction value.The alloys with Cu-addition would reach the maximum magnetostriction value when x=2 and 3.