Defects production and mechanical properties of typical metal engineering materials under neutron irradiation

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• 作者：Jian Liu ; XiaoBin Tang ; FeiDa Chen ; Hai Huang…
• 关键词：Monte Carlo ; molecular dynamics ; neutron irradiation ; displacement damage rate ; mechanical properties
• 刊名：SCIENCE CHINA Technological Sciences
• 出版年：2015
• 出版时间：October 2015
• 年：2015
• 卷：58
• 期：10
• 页码：1753-1759
• 全文大小：869 KB
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• 作者单位：Jian Liu (1)
  XiaoBin Tang (1) (2)
  FeiDa Chen (1)
  Hai Huang (1)
  Huan Li (1)
  YaHui Yang (1)
  
  1. Department of Nuclear Science & Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing, 210016, China
  2. Jiangsu Key Laboratory of Nuclear Energy Equipment Materials Engineering, Nanjing, 210016, China
  
• 刊物类别：Engineering
• 刊物主题：Chinese Library of Science
  Engineering, general
  
• 出版者：Science China Press, co-published with Springer
• ISSN：1869-1900

文摘

Maintaining the safety and reliability of nuclear engineering materials under a neutron irradiation environment is significant. Atomic-scale simulations are conducted to investigate the mechanism of irradiation-induced vacancy formation in CLAM, F82H and α-Fe with different neutron energies and objective laws of the effect of vacancy concentration on mechanical properties of α-Fe. Damage of these typical metal engineering materials caused by neutrons is mainly displacement damage, while the displacement damage rate and the non-ionizing effect of neutrons decrease with the increase of neutron energy. The elastic modulus, yield strength, and ultimate strength of α-Fe are in the order of magnitude of GPa. However, the elastic modulus is not constant but decreases with the increase of strain at the elastic deformation stage. The ultimate strength reaches its maximum value when vacancy concentration in α-Fe is 0.2%. On this basis, decreasing or increasing the number of vacancies reduces the ultimate strength. Keywords Monte Carlo molecular dynamics neutron irradiation displacement damage rate mechanical properties