Depth dependence and strain rate sensitivity of indentation stress of 6061 aluminium alloy

摘要: AbstractIndentation tests were performed on samples of 6061 aluminium alloy in the annealed, T4 and T6 temper conditions. The over a range loading rates to study effect indentation strain rate depth dependence average stress σind. While changes by several orders magnitude during constant nano-/microscale tests, we observed that sensitivity σind increases with decreasing for all tested. By applying an obstacle limited dislocation glide description deformation process, able demonstrate apparent activation energy obstacles is also dependent upon heat treatment condition test material. This suggests that, based assumption operative mechanism chosen, strength dislocation–obstacle interactions limit ...