Effect of irradiation on mechanical properties of symmetrical grain boundaries investigated by atomic simulations

JOURNAL OF NUCLEAR MATERIALS

卷:491

Article

Wang, X. Y.¹  Gao, N.²  Setyawan, W.³  Xu, B.¹  Liu, W.¹  Wang, Z. G.² 

[1] Tsinghua Univ, Sch Mat Sci & Engn, Beijing 100084, Peoples R China

[2] Inst Modern Phys, Lab Adv Nucl Mat, 509 NanChang Rd, Lanzhou 730000, Peoples R China

[3] Pacific Northwest Natl Lab, POB 999, Richland, WA 99352 USA

关键词: Symmetrical grain boundaries;    Stress-strain curve;    Mechanical degradation;    Radiation damage;    Molecular dynamics method;   

DOI  :  10.1016/j.jnucmat.2017.04.051

来源: Elsevier

【 摘 要 】

Tensile response of irradiated symmetric grain boundaries to the externally applied strain has been studied using atomic simulation methods. The absorption of irradiation induced defects by grain boundaries has been confirmed to degrade the mechanical properties of grain boundaries through the change of its undertaken deformation mechanism. Atomic rearrangement, the formations of a stress accumulation region and vacancy-rich zone and the nucleation and movement of dislocations under stress effect have been observed after the displacement cascades in grain boundaries, which are considered as main reasons to induce above degradation. These results suggest the necessity of considering both trapping efficiency to defects and the mechanical property change of irradiated grain boundaries for further development of radiation resistant materials. (C) 2017 Elsevier B.V. All rights reserved.

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