4.7 Article

Interstitial loop transformations in FeCr

期刊

JOURNAL OF ALLOYS AND COMPOUNDS
卷 640, 期 -, 页码 219-225

出版社

ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2015.03.173

关键词

Off-lattice kinetic Monte Carlo; Iron; Radiation damage; Chrome; Interstitial-loop

资金

  1. U.S. Department of Energy, Office of Basic Energy Sciences, Materials Sciences and Engineering Division, ''Center for Defect Physics,'' an Energy Frontier Research Center
  2. Fonds Quebecois de recherche Nature et Technologies

向作者/读者索取更多资源

We improve the Self-Evolving Atomistic Kinetic Monte Carlo (SEAKMC) algorithm by integrating the Activation Relaxation Technique nouveau (ARTn), a powerful open-ended saddle-point search method, into the algorithm. We use it to investigate the reaction of 37-interstitial 1/2[111] and 1/2[(11) over bar1] loops in FeCr at 10 at.% Cr. They transform into 1/2[111], 1/2[(11) over bar1], [100] and [010] 74-interstitial clusters with an overall barrier of 0.85 eV. We find that Cr decoration locally inhibits the rotation of crowdions, which dictates the final loop orientation. The final loop orientation depends on the details of the Cr decoration. Generally, a region of a given orientation is favored if Cr near its interface with a region of another orientation is able to inhibit reorientation at this interface more than the Cr present at the other interfaces. We also find that substitutional Cr atoms can diffuse from energetically unfavorable to energetically favorable sites within the interlocked 37-interstitial loops conformation with barriers of less than 0.35 eV. (C) 2015 Elsevier B.V. All rights reserved.

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