Abstract
Twins readily form during growth or deformation in metals of low stacking-fault energy. Fabrication of high-density growth nanotwins in high stacking-fault energy materials is technically challenging. We synthesize nanotwinned Ni foils with controlled twin patterns – pulsed electrodeposition produces conventional parallel nanotwins while direct current electrodeposition generates a new pattern of nanotwins in the parallelogram form. The parallelogram nanotwins confine dislocation motion in the cage of twin boundaries and lead to a superior strengthening effect in Ni.
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