An Investigation of Interface Bonding of Bimetallic Foils by Combined Accumulative Roll Bonding and Asymmetric Rolling T
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INTRODUCTION
METAL laminates have become increasingly popular for engineering applications since they usually possess several desirable properties. As such they are being increasingly used in various fields such as the automotive, aerospace, medical instrumentation, vessel, and electrical industries;[1] for example, laminates can be used for manufacturing parts with different ‘‘inner’’ and ‘‘outer’’ characteristics such as corrosion resistance, wear resistance, and thermal and electrical conductivities. Production of the laminates (e.g., using the deep drawing process) calls for combining the desirable properties of different materials in a single component. Atrian and Fereshteh-Saniee[1] studied the behavior of steel/brass laminated sheets in the deep drawing process. Of late, there is a great demand for micro-formed products. The global market for microsystems reached $25 billion in 2009, and continues to grow due the increasing demand for microtechnical products. Microforming is recognized as an emerging manufacturing process that involves the fabrication of products from ultra-thin foil material with thickness in the range from 0.001 to 0.3 mm. The development of adequate manufacturing facilities that can supply micro-formed parts in large quantities is, therefore, a key factor in the HAILIANG YU, Vice-Chancellor’s Research Fellow, is with the School of Mechanical, Materials & Mechatronics Engineering, University of Wollongong, Wollongong, NSW 2500, Australia, and also Professor with the School of Mechanical Engineering, Shenyang University, Shenyang 110044, P.R. China. Contact e-mail: [email protected], [email protected] A. KIET TIEU, Professor, CHENG LU, Associate Professor, and AJIT GODBOLE, Senior Research Fellow, are with the School of Mechanical, Materials & Mechatronics Engineering, University of Wollongong. Manuscript submitted August 24, 2013. METALLURGICAL AND MATERIALS TRANSACTIONS A
successful development of this process. In addition, the strength of the foils should be improved to maintain the structural stability of the microparts with reduction of the foil thickness. Relevant to this need is the development of nanostructured/ultrafine-grained materials, which have shown higher strength compared with coarse-grained materials. Thus, it would be very interesting to investigate the mechanical properties of ultrathin nanostructured/ultrafine-grained bimetallic foils and develop technologies for potential application in micro-forming. Among the composite material technologies, roll bonding (RB) is an important technique used to produce laminates because the rolling pressure can create a mechanical bond between the metal strip components.[2] Thus, the evolution of microstructure and mechanical properties during the roll bonding process have been studied, using composite sheets or strips of materials such as Al, Al/Mg, Al/Cu, Cu/Fe, Cu/Ag, IF steel, etc. A high-purity Al alloy and a supersaturated Al-0.3 wt pct Sc alloy were processed by accumulative roll bonding (ARB) to generate 0.5-mm gage she
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