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Magnetic observation of deformation substructure in cyclically deformed Fe_3Al single crystals

机译：周期性变形Fe_3Al单晶中变形亚结构的电磁观察

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摘要

Fe-28.0 at% Al single crystals with the D0_3 structure were cyclically deformed in tension-compression mode at constant total-strain amplitudes (ε_t). At and less than ε_t = 0.25%, the maximum stress increased rapidly with increasing number of cycles to 20, then remained constant during further cycling. In contrast, small cyclic softening appeared at and more than ε_t = 0.30% between the initial-and the final stages of cyclic hardening. The deformation substructure in cyclically deformed Fe_3Al single crystals was observed by both transmission electron microscopy (TEM) and magnetic technique. From TEM observation, pairs of superpartial dislocations with Burgers vector (b) of 1/4[111] moved dragging a next-nearest-neighbour antiphase boundary (NNN-APB) in the cyclic softening stage, though four superpartials generally moved in a group in the initial hardening stage. The change in dislocation configuration from four- to two-coupled superpartials may ease the cross-slip event resulting in the dislocation rearrangement and the cyclic softening. The magnetic properties of cyclically deformed Fe_3Al single crystals were examined by a vibrating sample magnetometer. In particular, magnetic anisotropy in the primary slip plane was evaluated by measuring high-field susceptibility in the approach to magnetic saturation at different directions of magnetic field. The cyclically deformed crystals exhibited strong magnetic anisotropy due to atomic rearrangement near NNN-APB and internal strain around screw dislocations. Two types of magnetic anisotropy were separated from each other by the Fourier transformation. In the cyclic softening stage, the amplitude of NNN-APB-dependent anisotropy rose abruptly between 10~2 and 10~3 cycles while that due to screw dislocations remained constant during fatigue. This suggested that a disordering of D0_3 phase due to fatigue did not occur in the softening stage. The maximum stress of Fe_3Al single crystals exceeded the required for superpartial pairs to drag NNN-APB, resulting in the cyclic softening.
机译：具有D0_3结构的Fe-28.0 at％Al单晶以恒定的总应变幅度（ε_t）在拉伸压缩模式下循环变形。在小于等于ε_t= 0.25％时，最大应力随着循环次数增加到20而迅速增加，然后在进一步循环中保持恒定。相反，在循环硬化的初始阶段和最终阶段之间，小的循环软化出现在ε_t= 0.30％以上。透射电子显微镜（TEM）和磁技术都观察到了周期性变形的Fe_3Al单晶的变形亚结构。从TEM观察，在周期软化阶段，具有Burgers矢量（b）为1/4 [111]的成对的超部分位错移动拖累了下一个近邻反相边界（NNN-APB），尽管通常四个超部分位错成组移动在最初的硬化阶段。位错构型从四偶合的超级部分到两偶合的超级部分的改变可能会缓解交叉滑移事件，从而导致位错重排和循环软化。通过振动样品磁力计检查了周期性变形的Fe_3Al单晶的磁性。尤其是，通过在磁场不同方向上达到磁饱和的方法中测量高场磁化率来评估主滑移面的磁各向异性。由于NNN-APB附近的原子重排以及螺旋位错周围的内部应变，周期性变形的晶体表现出强的磁各向异性。通过傅立叶变换将两种类型的磁各向异性彼此分离。在循环软化阶段，NNN-APB依赖的各向异性的振幅在10〜2和10〜3个循环之间突然上升，而在疲劳过程中，由于螺钉位错引起的各向异性保持恒定。这表明在软化阶段未发生由于疲劳引起的D0_3相紊乱。 Fe_3Al单晶的最大应力超过了超部分对拖动NNN-APB所需的应力，从而导致了循环软化。

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