Abstract
In this study, fully annealed AA5083 type alloy sheets with 1 mm in thickness were processed by accumulative roll bonding (ARB) at room temperature, up to 6 ARB cycles. It was found that microstructure was refined and mechanical properties were significantly improved with ARB processing. The maximum achieved values of hardness and tensile strength were two and three times greater than that of the initial material, respectively. This was attributed to the intensive strain hardening and grain size refinement which occurred during ARB deformation. However, the uniform elongation values were decreased by increasing the number of ARB cycles, and early fracture was registered. SEM fractography of fractured surfaces after tensile tests revealed a typical ductile fracture of ARB processed specimens, which was changed with ARB deformation. It was observed that ductile area on the fractured surfaces and the amount of necking, which occured before fracture, were decreased with increasing the number of ARB cycles.
Highlights
Non heat treatable Al-alloys, such as Al-Mg alloys of 5xxx series, have a great potential for application in the transportation industry, due to the low density (3× lower than in a steel), good weldability, corrosion resistance and ability to be recycled [1,2,3]
Results of this study showed that accumulative roll bonding (ARB) processing affected the grain morphology change, and a resistivity level of tested alloy
Grain morphology was changed and substantially refined, while mechanical properties were improved through ARB deformation
Summary
Non heat treatable Al-alloys, such as Al-Mg alloys of 5xxx series, have a great potential for application in the transportation industry, due to the low density (3× lower than in a steel), good weldability, corrosion resistance and ability to be recycled [1,2,3]. One of the important requests for their application in constructions of the transportation vehicles is providing a high strength and good formability. 285-295 of the strengthening mechanisms, which contributes to improvements in toughness, corrosion resistance and superplastic behavior at elevated temperatures [4] Vol 20 (4) 2014 p. 285-295 of the strengthening mechanisms, which contributes to improvements in toughness, corrosion resistance and superplastic behavior at elevated temperatures [4]
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