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本文根据应力各向异性、磁晶各向异性和磁矩转动技术磁化过程的原理，计算了不同取向单晶体的磁致伸缩应变理论值。在理想条件下，〈１１１〉轴向取向晶体的磁致伸缩性能最好；〈１１０〉和〈１１２〉取向性能相同，都比〈１１１〉稍差；〈１１３〉取向的性能最差；同时测量了低场下不同取向Ｔｂ－Ｄｙ－Ｆｅ多晶体的磁致伸缩性能，发现在低场下，〈１１０〉取向多晶体的磁致伸缩性能比〈１１２〉取向多晶体和〈１１１〉取向单晶体的磁致伸缩系数略高
According to the principle of magnetization of stress anisotropy, magnetocrystalline anisotropy and magnetic moment rotation, the theoretical values of magnetostrictive strain for different orientation single crystals are calculated. Under the ideal conditions, the <111> axial orientation crystal has the best magnetostrictive performance, the same orientation properties of <110> and <112>, which are slightly worse than <111>, the worst performance of <113> The magnetostrictive behavior of Tb-Dy-Fe polycrystals with different orientations in low field shows that the magnetostrictive properties of <110> -oriented polycrystals are better than that of <112> and <111> monoclinic Magnetostrictive coefficient slightly higher