Microstructure and Mechanical Properties of AA5005/AA6061 Laminated Composite Processed by Accumulative Roll Bonding
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INTRODUCTION
ULTRAFINE-GRAINED (UFG) materials have been gathering much interest for the last two decades as the materials have extraordinary mechanical properties such as high strength, low temperature superplastisity, and high corrosion resistance. Severe plastic deformation (SPD) is the most widely used method to produce UFG materials. Accumulative roll bonding (ARB) has become one of the most important SPD techniques since it was first introduced by Saito et al.[1] As the same equipment as in conventional rolling is used, ARB is considered to be one of the most promising methods for manufacturing UFG sheet materials.[2–4] ARB process is schematically shown in Figure 1. During ARB, rolling is conducted on two layered sheets which have exactly the same dimensions and have been stacked together beforehand. The rolling process not only provides large plastic deformation but also has an effect of bonding the two layers together. The bonded specimen of each cycle is subjected to undergo cutting, surface degreasing, brushing, and stacking together, to be ready for the next cycle.[1,2,5–7] As the thickness of the LIHONG SU, PhD Candidate, CHENG LU, Senior Lecturer, and KIET TIEU, Professor, are with the School of Mechanical, Materials and Methatronic Engineering, University of Wollongong, Australia. Contact e-mail: [email protected] GUANYU DENG, PhD Candidate, is with the School of Mechanical, Materials and Methatronic Engineering, University of Wollongong, and also with the State Key Lab of Rolling and Automation, Northeastern University, Shenyang, P.R. China. Manuscript submitted January 21, 2013. METALLURGICAL AND MATERIALS TRANSACTIONS B
specimen remains unchanged during the process, the deformation may occur repeatedly many times. Considerable microstructural refinement occurs as a result of the accumulative high plastic strain during the ARB process. The multilayered materials obtained from ARB are quite different from materials manufactured by other SPD methods such as equal channel angular pressing (ECAP) or high-pressure torsion (HPT) as the materials after ARB are more like a layered composite. The process also allows bonding of two different kinds of materials to occur so that different properties of the two dissimilar materials would combine. Many studies have been carried out in this area.[8–15] Al/Cu,[8] Cu/Ag,[9] Cu/ Zr,[9] Al/Ni,[10] Al/Mg,[11,12] Fe/Cu,[13] and some other laminated composites have been produced by ARB. Aluminum alloys find wide usage in the industry because of its light-weight nature. Aluminum alloys with UFG structure with extraordinary mechanical properties have high potential in the engineering application. High-strength aluminum alloys have been successfully processed by ARB.[6,7] Most of the research, though, uses one kind of aluminum alloy as the starting material. As stated by Hauso¨l et al.,[14] different aluminum alloys have different properties and combination of different types of aluminum alloys by ARB could result in materials with combination of the preferential properties of the
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