The tensile and impact resistance properties of accumulative roll bonded Al6061 and AZ31 alloy plates
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Al6061 and AZ31 plates were processed using accumulative roll bonding (ARB) method up to two passes to produce laminated composites. The sandwich stacks of Al6061/AZ31/Al6061 were held at 450 °C for 10 min in a cubical furnace and rolled together with reduction of 50% in one pass. The microstructural investigations were done using optical and scanning electron microscopes. The structures of the interface, mechanical and drop impact properties of the laminated composites after the first and second passes were investigated and compared with Al6061 and AZ31 alloy plates. It was found that Al6061 improved the elongation to failure property of AZ31 after the first pass of ARB process and the drop impact properties of AZ31 after the first and second passes. However, elongation to failure magnitude with the uniaxial tensile loading decreased with increase in the number of passes due to the formation of brittle intermetallic between the Al6061/AZ31 nonuniform interfaces.
I. INTRODUCTION
Recently, magnesium alloys are considered to be a good candidate in automotive, aerospace, and defense industry owing to their low density and high specific strength. But their low impact toughness, ductility, and corrosion resistance properties mitigate the applications of them in the aforementioned industries as structural materials. Magnesium and its alloys are known to be the lightest among conventional metallic materials including aluminum alloys and steel. On the other hand, aluminum alloys have been widely used especially in aerospace and automotive industries due to their high ductility and corrosion resistance properties. Since the density of the Al alloys is close to the density of magnesium alloys, producing aluminum–magnesium based laminar composites would be reasonable to obtain a material as light as magnesium alloys and as tough and corrosion resistant as aluminum alloys. The most common ways to bond aluminum and magnesium alloys are known as hot press (HP) and accumulative roll bonding (ARB) processes.1–3 HP could be conducted at elevated temperatures, under pressure for a certain period of time and mechanism of bonding depends on diffusion.1 ARB is known as a severe plastic deformation technique at which deformation bonding is the main mechanism.4 Laminated sheets are deformed, thus adhesion is obtained. The process may consist of cutting, stacking, and multiple rolling operations. Therefore, bulk ultrafine grained structures can be obtained a)
Address all correspondence to this author. e-mail: [email protected] DOI: 10.1557/jmr.2014.95 J. Mater. Res., Vol. 29, No. 10, May 28, 2014
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in addition to deformation bonding via conducting ARB process. Moreover, ARB is a relatively easy and a low-cost product and the method can be commercialized for conventional production. There are two options for ARB process such as hot ARB5 and cold ARB.4 Using ARB process, Al/Al,6 Mg/Mg,2,7 and Al/Mg/Al3,8–10 types of composites were produced and various features such as application of
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