| dc.description.abstract | We have recently reported an in-situ neutron-diffraction experiments, simultaneously illuminating the diffraction of the matrix and the strengthening nano precipitates. An irreversible neutron-diffraction-profile evolution of the nano precipitates is observed. However, due to the limited measuring time, there is no conclusive trend of the nano-precipitate deformation behavior subjected to the greater stress levels. Hence, in the present work, molecular-dynamics simulations are applied to reveal the deformation mechanisms of the nano precipitate and its interaction with the surrounding matrix. The microstructure size, dislocation content, and structural parameters of the nano precipitates, quantified by X-ray, transmission electron microscopy, and small-angle neutron scattering, are used as the simulation input and reference. The simulation results show that there are two competing deformation mechanisms, which lead to the fluctuation of the nano-precipitate-diffraction widths, occurring during the higher plastic deformation stages. Based on the comparable reported measurements and the current simulated results, we successfully developed a molecular dynamics simulation approach. The development is presented in this paper. | en_US |