Comparison of Tensile Properties of Electrodeposited Microcrystalline Ni, Ultrafine Grained Ni and Nanocrystalline Ni

Abstract:

Microcrystalline Ni (MC-Ni), ultrafine grained Ni (UFG-Ni) and nanocrystalline Ni (NC-Ni) with mean grain sizes of 2 μm, 120.7 nm and 22.4 nm, respectively were prepared by a pulsed electrodeposition method. The room-temperature one-way tensile tests show that the yield strength and the ultimate tensile strength of the three kinds of Ni deposits increase with decreasing of the grain size. The ductility of UFG-Ni decreases to 7.9% compared with 11.1% of the MC-Ni, while the UFG Ni shows a higher uniform elongation than MC-Ni. However, the ductility of NC-Ni is only 4.1%.