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<p>This study decodes the multiscale interaction between texture and dislocations during microplastic deformation using synchronous AE-TEM. Two samples with identical rolling reduction (70%) and annealing temperature (550&#xa0;°C, 1&#xa0;h) were examined: room-temperature rolled (RR) and cryo-rolled at −&#xa0;70&#xa0;°C (LR). Results show that a high proportion of low-angle grain boundaries (LAGBs) increase mobile dislocation density during microplastic deformation, but an excessive proportion in LR hinder dislocation motion, reducing activity. Three textures—{112} &lt; 110 &gt; , {100} &lt; 110 &gt; , and {111} &lt; 110 &gt; —were identified in both samples, with {100} &lt; 110 &gt; dominant in RR and {111} &lt; 110 &gt; primary in LR. The LR texture facilitates dislocation slip more than RR. Combining LAGBs and texture effects, this study suggests a synergistic regulatory role on microplastic deformation, influencing dislocation generation, multiplication, and cooperative motion. AE-TEM analysis reveals that dislocation multiplication dominates in both RR and LR, with higher activity in RR. Multiplication precedes cooperative motion, exhibiting a competitive tendency, especially in RR. The higher slip resistance texture and lower dislocation density in RR promote earlier multiplication and delayed cooperative motion compared to LR. Due to synergistic regulation, RR formed a high-density dislocation region. Proliferation signal amplitude and energy increased by 16% and 86%, respectively, while cooperative motion signals decreased by 16% and 3 times. Based on distinct deformation mechanisms, this paper proposes a characterization method integrating AE technology with microplastic damage assessment, advancing understanding of plastic deformation in metallic materials.</p>

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Texture-dislocation synergy: multiscale regulation of microplasticity prior to macroyielding in ingot iron

  • 期刊论文

  • 发表日期：

    2026年3月2日

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  • Shuangsheng Yan,
  • Jiyang Liu,
  • Shuo Yang,
  • Congjie Kang,
  • Qianqian Tian

摘要

This study decodes the multiscale interaction between texture and dislocations during microplastic deformation using synchronous AE-TEM. Two samples with identical rolling reduction (70%) and annealing temperature (550 °C, 1 h) were examined: room-temperature rolled (RR) and cryo-rolled at − 70 °C (LR). Results show that a high proportion of low-angle grain boundaries (LAGBs) increase mobile dislocation density during microplastic deformation, but an excessive proportion in LR hinder dislocation motion, reducing activity. Three textures—{112} < 110 > , {100} < 110 > , and {111} < 110 > —were identified in both samples, with {100} < 110 > dominant in RR and {111} < 110 > primary in LR. The LR texture facilitates dislocation slip more than RR. Combining LAGBs and texture effects, this study suggests a synergistic regulatory role on microplastic deformation, influencing dislocation generation, multiplication, and cooperative motion. AE-TEM analysis reveals that dislocation multiplication dominates in both RR and LR, with higher activity in RR. Multiplication precedes cooperative motion, exhibiting a competitive tendency, especially in RR. The higher slip resistance texture and lower dislocation density in RR promote earlier multiplication and delayed cooperative motion compared to LR. Due to synergistic regulation, RR formed a high-density dislocation region. Proliferation signal amplitude and energy increased by 16% and 86%, respectively, while cooperative motion signals decreased by 16% and 3 times. Based on distinct deformation mechanisms, this paper proposes a characterization method integrating AE technology with microplastic damage assessment, advancing understanding of plastic deformation in metallic materials.