The Influence of the Asymmetric Arb Process on the Properties of Al-Mg-Al Multi-Layer Sheets / Wpływ Asymetrii W Procesie Arb Na Właściwości Wielowarstwowych Blach Al-Mg-Al

Abstract

The paper presents the results of the experimental study of the three-layer Al-Mg-Al sheets rolling process by the ARB method. The tests carried out were limited to single-pass symmetric and asymmetric rolling processes. An Al-Mg-Al package with an initial thickness of 4 mm (1-2-1 mm) was subjected to the process of rolling with a relative reduction of 50%. To activate the shear band in the strip being deformed, an asymmetry factor of av=2 was applied. From the test results, an increase in the tensile strength of the multi-layer Al-Mg-Al sheets obtained from the asymmetric process was observed. Microhardness tests did not show any significant differences in aluminium layer between respective layers of sheets obtained from the symmetric and the asymmetric process. By contrast, for the magnesium layer, an increase in microhardness from 72 HV to 79 HV could be observed for the asymmetric rolling. The analysis of the produced Al-Mg-Al sheets shows that the good bond between individual layers and grain refinement in the magnesium layer contributed to the obtaining of higher mechanical properties in the multi-layer sheets produced in the asymmetric process compared to the sheets obtained from the symmetric process.

Analysis of the Strain Distribution and Texture Measurements in Asymmetric Rolling (AR) and Asymmetric Accumulative Roll Bonding (AARB)

“…AR, per se, is not an SPD since it is limited to strain levels of around two but, due to the shear components, it promotes greater grain refinement than CR [1,2]. Furthermore, AR has also been used as a method to improve adhesion and structure refinement in accumulative roll bonding (ARB) [3,4], thus extending the possibility of such technique to produce architectured microstructures and metallic composites. Here, we refer to the combination of these two processes as asymmetric accumulative roll bonding (AARB).…”

The Effect of Post-Weld Hot-Rolling on the Properties of Explosively Welded Mg/Al/Ti Multilayer Composite

“…Manufacturing of this material is very problematic, considering the significant differences in properties of components to be joined, such as melting point and ductility. An additional factor is the tendency of the formation of intermetallic compounds between Al/Ti and Mg/Al interfaces [1][2][3][4][5][6][7][8]. Despite the good mechanical properties of intermetallic phases, their brittleness causes further problems during the plastic forming of multilayer composite, including a risk of delamination.…”

The Effect of a Zinc Interlayer on the Microstructure and Mechanical Properties of a Magnesium Alloy (AZ31)–Aluminum Alloy (6060) Joint Produced by Liquid–Solid Compound Casting

“…Because of their unique properties, Mg/Al light bimetals have many potential applications, including the automotive industry. Mg/Al components can be fabricated using various methods: TIG welding, 1 resistance spot welding, 2 ultrasonic spot welding, 3 diffusion bonding, 4 hot rolling, 5,6 extrusion, 7,8 friction stir welding, 9 explosive cladding, 10 or compound casting. [11][12][13][14][15][16][17][18][19] The major problem related to the fabrication of Mg/Al bimetallic joints is the occurrence of hard and brittle Mg-Al intermetallic phases in the bonding zone, because they affect the properties of the bimetal elements, i.e., reduce their strength.…”