|Title||Coupled motion of grain boundaries in bcc tungsten as a possible radiation-damage healing mechanism under fusion reactor conditions|
|Publication Type||Journal Article|
|Year of Publication||2013|
|Authors||Borovikov, V, Tang, XZ, Perez, D, Bai, XM, Uberuaga, BP, Voter, AF|
|Type of Article||Article|
|Keywords||helium, iron, irradiation, iter, metals, migration, molecular-dynamics, rotation, simulation|
As a potential first-wall fusion reactor material, tungsten will be subjected to high radiation flux and extreme mechanical stress. We propose that under these conditions, coupled grain boundary ( GB) motion, in some cases enhanced by interstitial loading, can lead to a radiation-damage healing mechanism, in which a large stress activates coupled GB motion, and the GB sweeps up the defects, such as voids and vacancies, as it passes through the material. The stress-induced mobility characteristics of a number of GBs in tungsten are examined to investigate the likelihood of this scenario.
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