Effects of applied strain on nanoscale self-interstitial cluster formation in BCC iron

JOURNAL OF NUCLEAR MATERIALS

卷:493

Article

Gao, Ning¹  Setyawan, Wahyu²  Kurtz, Richard J.²  Wang, Zhiguang¹ 

[1] Chinese Acad Sci, Inst Modern Phys, Lanzhou 73000, Gansu, Peoples R China

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

关键词: Self-interstitial nanocluster;    Strain effect;    Anisotropy distribution factor;    Dislocation loop;    Molecular dynamics (MD);   

DOI  :  10.1016/j.jnucmat.2017.05.044

来源: Elsevier

【 摘 要 】

The effect of applied strains on the configurational evolution of self-interstitial clusters in BCC iron (Fe) is explored with atomistic simulations. A novel cluster configuration is discovered at low temperatures (< 600 K), which consists of < 110 > dumbbells and < 111 > crowdions in a specific configuration, resulting in an immobile defect. The stability and diffusion of this cluster at higher temperatures is explored. In addition, an anisotropy distribution factor of a particular [hkl] interstitial loop within the family of < hkl > loops is calculated as a function of strain. The results show that loop anisotropy is governed by the angle between the stress direction and the orientation of the < 111 > crowdions in the loop, and directly linked to the stress induced preferred nucleation of self-interstitial atoms. (C) 2017 Elsevier B.V. All rights reserved.

【 授权许可】

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