脉冲电沉积微晶镍、超细晶镍和纳米镍拉伸性能比较

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

摘要:

采用脉冲电沉积法分别制备微晶镍（MC-Ni）、超细晶镍（UFG-Ni）和纳米镍（NC-Ni），其平均晶粒尺寸分别为2 μm、120.7 nm、22.4 nm。室温单向拉伸试验结果表明：3种镍的屈服强度和抗拉强度随晶粒尺寸的减小而增大，与MC-Ni的塑性(11.1%)相比，UFG-Ni的塑性降至7.9%，但均匀应变值却比MC-Ni高，NC-Ni的塑性仅有4.1%。

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%.