Tensile deformation behaviors of pure nickel fine wire with a few grains across diameter
Tensile deformation behaviors of pure nickel fine wire with a few grains across diameter
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直径上有少量晶粒的纯镍细丝的拉伸变形行为
DOI：
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发表时间：
2016-07
影响因子：
4.5
通讯作者：
Zhen-long WANG
中科院分区：
文献类型：
--
作者：
Chuan-jie WANG;Chun-ju WANG;Jie XU;Peng ZHANG;De-bin SHAN;Bin GUO;Zhen-long WANG
实验研究了细镍丝单轴微拉伸塑性变形行为的尺寸效应，包括流变应力和非均匀变形行为。结果表明，随着晶粒尺寸的增大或沿直径方向晶粒数的减少，流变应力减小，变形不均匀程度增大。当直径方向晶粒数小于9.3时，流变应力随晶粒尺寸的增大而迅速减小。通过引入晶界尺寸因子，建立了细丝微拉伸流变应力的尺寸效应模型。这些结果还表明，断裂应变和应力都随着晶粒尺寸的增加而减小。当直径方向晶粒数小于14.7时，断裂应变和应力均迅速下降。这表明，微拉伸变形的不均匀程度随着沿直径方向晶粒数的减少而增加。
Size effects on plastic deformation behaviors in uniaxial micro tension of pure nickel fine wires were investigated experimentally, including flow stress and inhomogeneous deformation behaviors. It is found that with the increase of grain size or the decrease of number of grains across the diameter, the flow stress decreases and inhomogeneous deformation degree increases. When there are less than 9.3 grains across the diameter, the flow stress decreases quickly with the increase of grain size. Then, the flow stress size effect in micro tension of fine wires is revealed by a proposed model by introducing the grain boundary size factor. These results also indicate that both the fracture strain and stress decrease with the increase of grain size. When there are less than 14.7 grains across the diameter, both the fracture strain and stress decrease quickly. This indicates that the inhomogeneous deformation degree in micro tension increases with the decrease of the number of grains across the diameter.
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DOI：
10.1115/1.2386207
发表时间：
2007-08-01
影响因子：
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