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<p>The paper presents transmission electron microscopy of alloys based on the Cu-Al system, having a&#xa0;gradient structure in order to investigate the spatially continuous transformation of low-stable dislocation structures during large plastic strain to fracture. The identified sequence of strain carriers (dislocation structures) matches that observed before on the stress-strain curve. Two main sequences are observed for the transformation of dislocation structures with increasing distance from the fracture point. With increasing strain degree, the following sequential change in dislocation structures is observed for alloys Cu+0.5 and Cu+5&#xa0;at.% Al: fragmented, microband, misoriented cellular and non-misoriented cellular. Another sequential transformation is observed for alloys Cu+10 and Cu+14&#xa0;at.% Al with increasing distance from the fracture point: microband, microtwin, misoriented cellular network, non-misoriented cellular and stacking faults. A&#xa0;great number of bend extinction contours indicates to higher internal stress fields, which, in turn, denote the low localized stability of the structure.</p>

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Spatially continuous transformation of low-stable dislocation structures in gradient-structured alloys

  • 期刊论文

  • 发表日期：

    2026年1月15日

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  • L. I. Trishkina,
  • A. I. Potekaev,
  • A. A. Klopotov,
  • T. V. Cherkasova,
  • V. I. Borodin,
  • O. G. Volokitin

摘要

The paper presents transmission electron microscopy of alloys based on the Cu-Al system, having a gradient structure in order to investigate the spatially continuous transformation of low-stable dislocation structures during large plastic strain to fracture. The identified sequence of strain carriers (dislocation structures) matches that observed before on the stress-strain curve. Two main sequences are observed for the transformation of dislocation structures with increasing distance from the fracture point. With increasing strain degree, the following sequential change in dislocation structures is observed for alloys Cu+0.5 and Cu+5 at.% Al: fragmented, microband, misoriented cellular and non-misoriented cellular. Another sequential transformation is observed for alloys Cu+10 and Cu+14 at.% Al with increasing distance from the fracture point: microband, microtwin, misoriented cellular network, non-misoriented cellular and stacking faults. A great number of bend extinction contours indicates to higher internal stress fields, which, in turn, denote the low localized stability of the structure.