Abstract
Abstract Stoichiometric [110] oriented NiAl single crystals were deformed by compression creep tests at 300 °C up to 3.6%. To ascertain the role of surface conditions, deformation samples with mechanically polished, rough and oxidised surfaces were used. The polished samples were most easy to deform. An oxide layer of about 600 nm thickness did not give rise to softening due to poor oxide adherence. The dislocation substructure in the bulk and near the surfaces was investigated by TEM. The different arrangements were discussed with regard to dislocation generation at the surfaces, cross-slip and mutual annihilation of screw dislocations and edge dislocation trapping to form dipoles.
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