On the onset of void ordering in metals under neutron or heavy-ion irradiation

Abstract

HAL is a multi-disciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L'archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d'enseignement et de recherche français ou étrangers, des laboratoires publics ou privés. On the onset of void ordering in metals under neutron or heavy-ion irradiationAlexander V Barashev, Stanislav I Golubov To cite this version:Alexander V Barashev, Stanislav I Golubov. On the onset of void ordering in metals under neutron or heavy-ion irradiation. Philosophical Magazine, TaylorFrancis, 2010, 90 (13) Formation of void lattices is observed in a number of metals and alloys under high-energy particle bombardment. Here we derive the conditions for destabilisation of homogeneous void arrangement using an approach developed for the description of lane formation in pedestrian crowds. The model is based on the Foreman's mechanism of void alignment due to onedimensionally-migrating clusters of self-interstitial atoms. The results show that spatial correlations between voids should exist above some very small size, unless correlations with other defects prevail. It is shown that spatial correlations of voids with dislocations and secondphase precipitates should also evolve and provide a powerful driving force for further swelling.

Radiation-induced damage and evolution of defects in Mo

“…However, there are contradicting statements in the previous works about the mechanisms and dimensionality of di-interstitial SIA (di-SIA) and SIAC diffusion. 2,13,14,16,17 At the same time, the comparison with the recent experimental results showed a large discrepancy in the diffusivity of dislocation loops. 4 The understanding of the mechanisms of the production of large clusters of defects is of practical importance for reducing the irradiation embrittlement.…”

“…Although many features of the radiation damage have been explained, several phenomena are still discussed, including the mechanisms of production of large clusters of defects and dislocation loops, 5,[8][9][10][11][12] the effect of PKA mass on the defect yield, 8,12 the influence of surfaces in the experiments with thin foils, 8 the mobility of self-interstitial atoms (SIAs), clusters (SIACs), and dislocation loops. 2,4,[13][14][15][16] One of the most plausible explanations of the formation of superlattices of bubbles [1][2][3]13,14,16 in several metals under the radiation damage is based on the anisotropic diffusion of SIAs or SIACs. However, there are contradicting statements in the previous works about the mechanisms and dimensionality of di-interstitial SIA (di-SIA) and SIAC diffusion.…”

“…In the case of the in-cascade formation of clusters, the influence of impurities is not clear. 18 Recent experiments on low-dose (<10 16 ions/m 2 ) irradiation of Mo single-crystal foils revealed the formation of vacancy loops within individual cascades by a process of cascade collapse. 8 In iron, under self-ion irradiation, the cascade collapse is not observed at low doses, 6 while visible damage is seen at high ion doses when cascade overlap becomes significant as well as in the cascades initiated by more massive ions.…”

Comments on ‘On the onset of void ordering in metals under neutron or heavy-ion irradiation’

“…H. Evans * Camrose Consultants, 27 Clevelands, Abingdon, Oxon., OX14 2EQ, UK Abstract. In their recent paper on void ordering, Barashev and Golubov [1] describe cavity lattice formation in austenitic steel under electron irradiation as a bubble lattice rather than a void lattice. While this is convenient for the model they propose, this comment gives several reasons why the bubble lattice assignation cannot be justified.…”

“…Barashev and Golubov [1] describe a model of void lattice formation based on the one dimension migration of self-interstitial atom (SIA) clusters emanating from collision cascades under neutron or heavy ion bombardment. To avoid the difficulty (to their model) of the observation of void ordering in 1 MeV electron irradiated nitrided austenitic stainless steel [4] they have repeated an interpretation of this observation by Trinkaus and Jäger [5] which suggested that the high concentration of nitrogen reported in the steel had led to the formation of a nitrogen bubble lattice, rather than a void lattice.…”