Helium retention with dislocations in deformed pure iron

分类： 物理学 >> 凝聚态:结构、力学和热性能 提交时间： 2017-03-26

Y. H. Gong X. Z. Cao S. X. Jin E. Y. Lu Y. C. Hu T. Zhu P. Kuang Q. Xu B. Y. Wang

摘要： Effects of deformed dislocation on helium retention in pure iron, including the helium atoms diffusion along the dislocation line and desorption from dislocation trapping sites, were investigated. The dislocation defect was introduced in specimens by cold-rolling, and then 5 keV helium ions were implanted into the deformed specimens. Slow positron beam technology and thermal desorption spectroscopy were used to investigate the evolution of dislocation defects and the desorption behavior of helium atoms under influence of dislocation. The behaviors of S-E, W-E and S-W plots indicate clearly that lots of helium atoms remain in the deformed specimen and helium atoms combining with dislocation change the distribution of electron density. The helium desorption plot indicates that dislocation accelerates helium desorption at 293 K-600 K and facilitates helium dissociation from HenVm (n/m=1.8) cluster.

同行评议状态:待评议

 点击量 2065  下载量 1137  评论