Abstract
Superior radiation tolerance has been experimentally examined in nanotwinned metals. The stability of nanotwinned structure under radiation is the key factor for advancing the application of nanotwinned metals for nuclear reactors. We thus performed in situ radiation tests for nanotwinned Cu with various twin thicknesses inside a transmission electron microscope. We found that there is a critical twin thickness (10nm), below which, radiation induced detwinning is primarily accomplished through migration of incoherent twin boundaries. Detwinning is faster for thinner twins in this range, while thicker twins are more stable.
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