Texture Evolution of Nanostructured Aluminum/Copper Composite Produced by the Accumulative Roll Bonding and Folding Proc
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METALLIC multilayered composites, consisting of alternating metal or reinforced metal layers, can dramatically improve a range of mechanical properties.[1] Metallic multilayer composites are generally produced by two main methods: (1) coating processes like ion sputtering and evaporation in order to make thin films,[2,3] (2) deformation processes like accumulative roll bonding (ARB),[1,4–8] repeated press and rolling,[9,10] cold roll/heat treatment/cold roll,[11,12] and repeated folding and rolling (F&R)[13,14] processes. The ARB process, which is one of the severe plastic deformation (SPD) methods, consists of cutting sheets into stacks and roll bonding. By repeating this procedure, a very high strain is introduced into the material which could result in a significant structural refinement.[15–18] It has been verified that the redundant shear strain that may be introduced to the material significantly contributes to the grain refinement. The ARB process has been performed mostly by 50 pct reduction in thickness and two stacking layers. By increasing the number of stacking MOHAMMAD REZA TOROGHINEJAD, Associate Professor, and ROOHOLLAH JAMAATI, PhD Student, are with the Department of Materials Engineering, Isfahan University of Technology, 8415683111 Isfahan, Iran. Contact e-mail: [email protected] MAJID HOSEINI, PhD Graduate, is with the Department of Mining, Metals and Materials Engineering, McGill University, Montreal, QC H3A 2B2, Canada. JERZY A. SZPUNAR, Professor, is with the Department of Mechanical Engineering, University of Saskatchewan, Saskatoon, SK S7N 5A9, Canada. JAN DUTKIEWICZ, Professor, is with the Institute of Metallurgy and Materials Science of the Polish Academy of Sciences, ul. Reymonta 25, 30-059 Krakow, Poland. Manuscript submitted January 6, 2012. Article published online November 9, 2012 METALLURGICAL AND MATERIALS TRANSACTIONS A
layers and the reduction per pass, some advantages are expected: (1) The productivity would increase, (2) the bond strength between the stacked layers would improve, and (3) more severe compressive and shear deformation could be introduced into the materials.[15–18] A similar procedure to ARB (known as F&R) has been used to synthesize multilayer composites from metallic foils.[13,14] This method differs from the classic ARB in terms of the amount of strain and the absence of intermediate brushing. In this research, a new method is developed by combining the advantages of ARB and F&R in order to produce Al/Cu composite from aluminum and copper metallic foils. The method is named the accumulative roll bonding and folding (ARBF) process. The production speed of this method is higher than ARB and can produce bulk samples from foils with an initial thickness greater than the foils used in F&R. The evolution of crystallographic texture during the rolling has long been a subject of research as the anisotropy of mechanical properties is significantly influenced by the texture developed during the processing. The texture is an important feature to control the prop
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