电沉积宽晶粒尺寸分布纳米镍的本征拉伸行为

稀有金属材料与工程, 2010, 39(10): 1845-1848.

电沉积宽晶粒尺寸分布纳米镍的本征拉伸行为

郑耀东 ^1, , 戴品强 ^2, , 许伟长 ^3, , 胡树韧 ^4,

1.福州大学,福建,福州,350108

2.福州大学,福建,福州,350108;福建工程学院,福建,福州,350108

3.福州大学,福建,福州,350108

4.北京工业大学,北京,100124

基金项目: 福建省科技计划重点项目(2006H0020) 福建省自然科学基金(E0410011)

关键词：纳米镍 , 拉伸行为 , 阴极析氢 , 电沉积

Intrinsic Tensile Behavior of Electrodeposited Nanocrystalline Ni with a Broad Grain Size Distribution

通过直流电沉积制备平均晶粒度为27.2 nm,宽晶粒尺寸分布(10～120 nm)的纳米镍(B-NC-Ni).在B-NC-Ni的拉伸实验中,存在着两类不同的工程应力-应变曲线及宏观断口,结果表明:完整的拉伸曲线即本征曲线,具有恒应力变形阶段,宏观断口呈切断;而不完整的拉伸曲线在平台出现之前已发生断裂,主要是由于电沉积时阴极析出的H可能会使镀层形成空位和微孔两类缺陷,均会加剧变形时晶界上裂纹的形成,宏观断口呈正断.此外,实验中杂质S(0.015%,质量分数,下同)对B-NC-Ni的拉伸性能影响可忽略.

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材料期刊网

电沉积宽晶粒尺寸分布纳米镍的本征拉伸行为

Intrinsic Tensile Behavior of Electrodeposited Nanocrystalline Ni with a Broad Grain Size Distribution

参考文献