Effect of the route and strain of equal-channel angular pressing on structure and properties of oxygen-free copper

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• 作者：S.V. Dobatkin ; J.A. Szpunar ; A.P. Zhilyaev ; J.-Y. Cho ; A.A. Kuznetsov
• 关键词：Severe plastic deformation ; Equal-channel angular pressing ; Cell ; Subgrain ; Submicrocrystalline structure ; Oxygen-free copper ; Strength
• 刊名：Materials Science and Engineering: A
• 出版年：2007
• 出版时间：25 July 2007
• 年：2007
• 卷：462
• 期：1-2
• 页码：132-138
• 全文大小：1838 K

文摘

Structure and properties of oxygen-free copper (99.98 % ) in dependence on strain and routes during equal-channel angular (ECA) pressing at room temperature up to strains 29 are studied. At 29, according to orientation imaging microscopy (OIM) analysis, the minimum size of structure elements, 230 nm, corresponds to route B<sub>csub>, and the maximum fraction of high-angle boundaries, 77 % , corresponds to route A. The sizes of structure elements revealed by analysis were larger than those determined by transmission electron microscopy (TEM). The strength characteristics of oxygen-free copper after equal-channel angular pressing increase by a factor of 1.5–1.7 and remain virtually constant in the deformation range 6–29 for all routes. The maximum UTS and YS values correspond to route B<sub>csub>. The ductility decreases after the first pass and increases after ten passes, especially for route B<sub>csub>.