Research Abstract


Dislocation Loop Formation and Growth under In Situ Laser and/or Electron Irradiation

2011年12月12日 Scientific Reports 1 : 190 doi: 10.1038/srep00190


ヤン・チャンビン1, 坂口 紀史1, 渡辺 精一1 & 川合 將義2

  1. 北海道大学大学院工学研究院附属エネルギー・マテリアル融合領域研究センター
  2. 高エネルギー加速器研究機構
Vacancies and interstitial atoms are primary lattice (point) defects that cause observable microstructural changes, such as the formation of dislocation loops and voids in crystalline solids. These defects’ diffusion properties determine the phase stability and environmental resistibility of macroscopic materials under ambient conditions. Although in situ methods have been proposed for measuring the diffusion energy of point defects, direct measurement has been limited. In this study, we propose an alternative in situ method to measure the activation energy for vacancymigration under laser irradiation using a pulsed laser beam from a laser-equipped high-voltage electron microscope (laser-HVEM).We made in situ observations that revealed the formation and growth of vacancy dislocation loops in an austenitic stainless steel during laser irradiation. These loops continued to grow when thermal annealing was performed after laser irradiation at the same temperature. We anticipate that laser-HVEM will provide a new method for investigating lattice defects.