Microstructure and Mechanical Properties of Accumulative Roll-Bonded AA1050A-AA5005 Laminated Metal CompositesReportar como inadecuado




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Materials Science and Engineering, Institute I, Friedrich-Alexander-Universität Erlangen-Nürnberg FAU, Martensstr. 5, Erlangen 91058, Germany





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Academic Editor: Hugo F. Lopez

Abstract Laminated metal composites LMCs with alternating layers of commercial pure aluminum AA1050A and aluminum alloy AA5005 were produced by accumulative roll-bonding ARB. In order to vary the layer thickness and the number of layer interfaces, different numbers of ARB cycles 4, 8, 10, 12, 14 and 16 were performed. The microstructure and mechanical properties were characterized in detail. Up to 8 ARB cycles, the ultrafine-grained UFG microstructure of the layers in the LMC evolves almost equally to those in AA1050A and AA5005 mono-material sheets. However, the grain size in the composites tends to have smaller values. Nevertheless, the local mechanical properties of the individual layers in the LMCs are very similar to those of the mono-material sheets, and the macroscopic static mechanical properties of the LMCs can be calculated as the mean value of the mono-material sheets applying a linear rule of mixture. In contrast, for more than 12 ARB cycles, a homogenous microstructure was obtained where the individual layers within the composite cannot be visually separated any longer; thus, the hardness is at one constant and a high level across the whole sheet thickness. This results also in a significant higher strength in tensile testing. It was revealed that, with decreasing layer thickness, the layer interfaces become more and more dominating. View Full-Text

Keywords: accumulative roll-bonding ARB; ultrafine-grained UFG laminated metal composites LMCs; microstructure; mechanical properties accumulative roll-bonding ARB; ultrafine-grained UFG laminated metal composites LMCs; microstructure; mechanical properties





Autor: Frank Kümmel, Michael Kreuz, Tina Hausöl, Heinz Werner Höppel * and Mathias Göken

Fuente: http://mdpi.com/



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