<110>Dislocation junction formation via coalescence between nanoscale ½ <111>prismatic dislocation loops in iron

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  • Arakawa Kazuto
    Department of Materials Science, Faculty of Science and Engineering, Shimane University
  • Amino Takafumi
    Advanced Technology Research Laboratories, Nippon Steel & Sumitomo Metal Corporation
  • Yasuda Hidehiro
    Research Center for Ultra-High Voltage Electron Microscopy, Osaka University
  • Mori Hirotaro
    Research Center for Ultra-High Voltage Electron Microscopy, Osaka University

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  • <110> Dislocation Junction Formation via the Coalescence between Nanoscale 1/2<111> Prismatic Dislocation Loops in Iron

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<p>Accurate knowledge of dislocation reactions is crucial for understanding and controlling the macroscopic mechanical properties of α-iron and its alloys. A dislocation reaction: 1/2[111]+1/2[111]→[110] has never been observed. However, using in-situ transmission electron microscopy, we demonstrate that the two nanoscale 1/2<111> prismatic dislocation loops that undergo 1D glide motion approach and collide with each other to form a “high-energy” [110]-dislocation junction. This anomalous reaction cannot be understood within the framework of the elasticity.</p>

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