4-14 First-principles Investigation of Helium Segregations at Grain Boundaries in Tungsten

• 作者: Gao Xing He Wenhao Wang Zhiguang
• 来源期刊: 中国科学院近代物理研究所和兰州重离子研究装置年报：英文版
• 学科: 物理学
• 年，卷（期）: 2016,（1）
• 页码范围: 126-127
• 页数: 2页
• 分类号: O4

摘要

Tungsten is one of the promising candidates for plasma facing materials(PFMs),such as the first wall materials and divertor,of the magnetic confinement fusion reactor due to its high melting temperature,high thermal conductivity and low sputtering erosion.The PFMs will be exposed to a high flux of helium atoms escaping from the plasma[1].The helium atoms in metals tend to assemble in vacancies,dislocations,and grain boundaries(GBs),and form helium bubbles,which can significantly degrade the mechanical properties of materials.