The paper presents the results of the transmission electron microscopy of the evolution of the dislocation substructure (DSS) of the polycrystalline ordered and disordered Pd₃Fe alloys with low-stable structure and phase compositions. A flow chart is suggested for the transformation of the dislocation substructures during a transition from one stage to another. These stages are indicated on the stress-strain curves of the Pd₃Fe alloy. It is found that in the case of both disordered and ordered alloys, each deformation stage is characterized by a specific dislocation substructure, which is the main deformation medium for each stage. A transition from one DSS type to another occurs at a certain range of the deformation degree. The DSS type characteristic to a given stage of deformation appears at a preceded stage and its amount increases with the deformation growth. At a given deformation stage, this amount is the highest, while during the transition to another stage, it gradually lowers and disappears. In the ordered alloys, the DSS types differ from those in the disordered alloys at the same deformation stage. It is shown that at each deformation stage, there are specific dislocation substructures or deformation media. During the transition to a new stage, the transition to a new structural deformation media occurs, and these media exist together. This is characteristic to the low-stability state of the whole system.

本文介绍了具有低稳定结构和相组成的多晶有序无序Pd ₃ Fe合金的位错亚结构（DSS）演变的透射电子显微镜结果。为从一个阶段到另一个阶段的过渡过程中位错子结构的转换提出了一个流程图。这些阶段显示在Pd ₃的应力-应变曲线上铁合金。发现在无序合金和有序合金的情况下，每个变形阶段的特征都是特定的位错子结构，这是每个阶段的主要变形介质。在变形程度的一定范围内会发生从一种DSS类型到另一种DSS类型的转变。给定变形阶段的DSS类型特征出现在前一个阶段，并且其数量随变形的增长而增加。在给定的变形阶段，此数量最大，而在过渡到另一个阶段时，它逐渐降低并消失。在有序合金中，DSS类型与在相同变形阶段的无序合金中的DSS类型不同。结果表明，在每个变形阶段，都有特定的位错亚结构或变形介质。在过渡到新阶段的过程中，发生了向新的结构变形介质的过渡，并且这些介质一起存在。这是整个系统的低稳定性状态的特征。