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

Gao, Ning; Kurtz, Richard J.

doi:10.1016/j.jnucmat.2017.05.044

Cited by 7 publications

(1 citation statement)

References 49 publications

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“…This strain effect extends to the size of defect clusters [12,14]. Additional defect property regarding threshold displacement energy [15,16], formation [17] and migration energy [18] can also be modified.…”

Section: A U T H O R Accepted Manuscript I Introductionmentioning

confidence: 99%

Revealing the Strain Effect on Radiation Response of Amorphous–Crystalline Cu-Zr Laminate

Jin

Cao

2019

JOM

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Nanocrystalline materials containing amorphous intergranular films (AIFs) exhibit excellent mechanical properties, radiation resistance, and thermal stability, which may serve as promising candidate materials in advanced nuclear energy systems. Here, we aim to unveil the effect of mechanical stress on the radiation damage behavior of the AIF systems. Based on a bi-crystal Cu system with Zr-doped AIFs, we use molecular dynamics to simulate the radiation process, and examine the AIF sink efficiency, defect propensity, defect size distribution, and Zr mixing under uni-axial and hydrostatic strain conditions.We found the sink efficiency of the glue-like AIFs is not compromised with the applied strains. The anisotropy resulting from the intrinsic microstructure and elastic deformation leads to distinct radiation response, where extension (contraction) of the structure perpendicular to AIFs increases (decreases) vacancy density. The strain dependent defect density, along with the cluster size distributions can be interpreted from variations in defect formation energy and anisotropic defect diffusion. Finally, the Zr mixing induced by collision cascades is found insensitive to the mechanical strains. These findings provide meaningful information towards understanding the stress effect on the radiation response of AIF systems.

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