Abstract
To investigate irradiation-induced embrittlement in ferritic/martensitic (F/M) steels, molecular dynamics are applied to simulate tensile deformation of grain boundaries (GBs) under the effects of helium bubbles and Cr precipitates in pure $\alpha $ -Fe. Strength and elongation of symmetric tilt GBs with $\langle 110\rangle $ and $\langle 100\rangle $ tilt axis at 300 K are calculated to investigate the effects of helium-vacancy (He-V) cluster sizes and helium/vacancy (He/V) ratios in clusters. The results show that He-V clusters have notable suppression on GB plastic deformation. The size effect of He-V clusters on GB gliding seems to be stronger than that of He-V ratio. It is interested that the suppression of Cr precipitates is much weaker than He-V clusters. Visualization analyses show that the plasticity of GB is induced by GB glide and the He-V clusters have significant suppression on its glide.
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