Anelasticity of Phase Transitions and Magnetostriction in Fe-(27-28%)Ga Alloys

Several aspects of anelastic behavior of Fe-(27-28%)Ga-Tb alloys are considered in this paper: (i) the phase transitions from a metastable to an equilibrium phase and phase transitions between equilibrium phases at higher temperatures in as cast alloys, (ii) the nature of corresponding three transient anelastic effects, (iii) the formation of an intrinsic composite microstructure with a different ratio between the bcc-derivative metastable and fcc-derivative equilibrium phases that have different magnetostriction and the effect of alloys doping by Tb to stabilize the metastable phase with high positive values of magnetostriction.本文针对Fe-(27-28%)Ga-Tb合金的滞弹性行为（anelastic behavior）开展了多维度研究，具体涵盖以下三方面内容：（1）铸态合金中，亚稳相向平衡相的相变过程，以及高温下各平衡相之间的相变行为；（2）对应三类瞬态滞弹性效应的本质属性；（3）由不同占比的体心立方（body-centered cubic, bcc）衍生亚稳相与面心立方（face-centered cubic, fcc）衍生平衡相构成的本征复合微观组织的形成机制，两类相的磁致伸缩（magnetostriction）性能存在差异；以及铽（Tb）掺杂对该合金中具有高正磁致伸缩值的亚稳相的稳定作用效果。