Individual strain gradient effect on torsional strength of electropolished microscale copper wires

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• 作者：Song Guo ; Yuming He ; ^{ymhe01@sina.com} ; Jian Lei ; Zhenkun Li ; Dabiao Liu ; ^{dbliu@hust.edu.cn}
• 关键词：Torsion ; Size effect ; Strain gradient ; Electropolishing ; Copper wires
• 刊名：Scripta Materialia
• 出版年：2017
• 出版时间：15 March 2017
• 年：2017
• 卷：130
• 期：Complete
• 页码：124-127
• 全文大小：861 K
• 卷排序：130

文摘

Torsion experiments on copper wires with different diameters but the same grain size are performed to figure out the individual contribution of plastic strain gradient to size effect. The samples are prepared by electropolishing the wires with an initial diameter of 50 μm at room temperature for different time periods. A significant strain gradient effect is confirmed in wire torsion. Tensile results on the same wires verify that the tensile strength is not significantly affected by the diameters. The Fleck-Hutchinson strain gradient plasticity theory is employed to analyze the torsional responses, giving a material length scale of about 3 μm.