Ce_x(Tb_(0.27)Dy_(0.73))_(1-x)Fe_2合金的结构与磁致伸缩

Structure and Magnetostriction of Ce_xR_(1-x)Fe_2 Alloys (R=Tb_(0.27)Dy_(0.73),0≤x≤1)

采用Ｘ射线、金相和应变测试技术研究了Ｃｅｘ（Ｔｂ０．２７Ｄｙ０．７３）１－ｘＦｅ２合金的显微结构、晶格常数及磁致伸缩，结果表明未退火合金的主相为ＭｇＣｕ２型立方结构的１∶２相，第二相为１∶３相，且随着Ｃｅ含量的增加，第二相的含量也逐渐增加．经过７００ ℃，７２ ｈ退火后，第二相的含量明显减少．合金的晶格常数和磁致伸缩随Ｃｅ含量的增加而减小．

The microstructure，lattice parameter and magnetostriction o f Cex(Tb0.27Dy0.73)1-x Fe2 alloy have been investigated by using meta llurgical microscopy，X-ray diffraction and standard gauge technique. It was found that the matrix of unhomogenized Cex(Tb0.27Dy 0.73)1-x Fe 2 Alloy is the MgCu2-type cubic phase with the second phase of Cex(Tb 0.27Dy0.73)1-x Fe3(1:3 phase).The amount of the second phase increase s with increasing Ce content and decrease greatly by annealing at 700 ℃for 72 h .The lattice parameter and magnetostriction of Cex(Tb 0.27 Dy0.73）1-x Fe2 alloy decrease with increasing Ce content.