[1]许伟长,戴品强..标距尺寸对纳米镍拉伸性能的影响[J].郑州大学学报(工学版),2009,30(01):48-52.[doi:10.3969/j.issn.1671-6833.2009.01.011]
　Xu Weichang,Dai Pinqiang.Effect of gauge size on tensile properties of nano-nickel[J].Journal of Zhengzhou University (Engineering Science),2009,30(01):48-52.[doi:10.3969/j.issn.1671-6833.2009.01.011]
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标距尺寸对纳米镍拉伸性能的影响()
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《郑州大学学报(工学版)》[ISSN:1671-6833/CN:41-1339/T]

卷:
30卷
期数:
2009年01期
页码:
48-52
栏目:
出版日期:
1900-01-01

文章信息/Info

Title:
Effect of gauge size on tensile properties of nano-nickel
作者:
许伟长; 戴品强.
福州大学,材料学院,福建,福州,350108, 福州大学,材料学院,福建,福州,350108
Author(s):
Xu Weichang; Dai Pinqiang
关键词:
纳米镍;  力学性能;  剪切带;  电沉积;  晶粒尺寸分布
Keywords:
DOI:
10.3969/j.issn.1671-6833.2009.01.011
文献标志码:
A
摘要:
采用直流电沉积制备了平均晶粒尺寸为27.2 nm且宽晶粒尺寸为5～120 nm的纳米镍.通过室温单向拉伸实验研究了标距尺寸对纳米镍力学性能的影响.研究发现,纳米镍的屈服强度随标距长宽比(r)的增加而增加,弹性、塑性应变均随r的增加而减小,标距尺寸对拉伸中的剪切断裂行为没有影响;通过TEM对拉伸断口、剪切带组织的观察,发现纳米镍变形后平均晶粒尺寸较镀态下具有明显粗化,剪切带是由变形过程中首先粗化的晶粒区发生进一步的集中塑性变形引起的,剪切带上晶粒沿特定方向被拉长,平直的晶界对应于SEM观察到的平行线.
Abstract:
Nano-nickel with an average grain size of 27.2 nm and a wide grain size of 5~120 nm was prepared by direct current deposition. The effect of gauge size on the mechanical properties of nano-nickel was studied by unidirectional tensile experiment at room temperature. It is found that the yield strength of nano-nickel increases with the increase of the gauge aspect ratio (r), the elastic and plastic strain decrease with the increase of r, and the gauge size has no effect on the shear fracture behavior in tension. Through TEM’s observation of the structure of tensile fracture and shear band, it is found that the average grain size after the deformation of nano-nickel is significantly coarsed compared with the plating state, and the shear band is caused by further concentrated plastic deformation of the grain area that is first coarsed during the deformation process, and the grain on the shear band is elongated in a specific direction, and the straight grain boundary corresponds to the parallel line observed by SEM.

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更新日期/Last Update: 1900-01-01