退火磁场施加方式对Tb_(0.3)Dy_(0.7)Fe_(1.95)合金磁伸性能的影响

Effect of applied mode of annealing magnetic field on magnetostriction of Tb_(0.3)Dy_(0.7)Fe_(1.95) alloy

研究了磁场退火时磁场施加方式对〈110〉取向Tb0.3Dy0.7Fe1.95定向凝固多晶合金磁致伸缩性能的影响。退火磁场强度为1T,保温时间30min。研究表明,在623K下采用垂直磁场且冷却时保持磁场的方式退火,可改善综合磁伸性能,如提高饱和磁致伸缩系数并使低场磁致伸缩系数基本不变,提高最大动态磁致伸缩系数且其对应的磁场基本不变。冷却阶段撤去磁场会减弱磁场退火的作用,而平行磁场退火的效果与垂直磁场相反。

The effect of applied mode in magnetic annealing field on magnetostriction of -oriented polycrystalline Tb0.3Dy0.7Fe1.95 alloy was investigated. Annealing was conducted at 623K and 723K for 30min under magnetic field of 1T. The results show that magnetic annealing at 623K with applied magnetic field perpendicular to specimen axis and cooling under magnetic field can improve the magnetostriction properties, including the increases of saturation magnetostriction coefficient and maximum dynamic magnetostriction coefficient (d33), as well as the unchanges of low-field magnetostriction coefficient and magnetic field for maximum d33. Cooling without magnetic field makes the effect of magnetic annealing weakened, and parallel application of annealing magnetic field induces an inversed effect to perpendicular application.