Study of deformation texture in an AZ31 magnesium alloy rolled at wide range of rolling speed and reductions

Sanjari, M and Tamimi, Saeed and Su, J and Utsunomiya, H. and Petrov, R. and Kestens, L.; Skrotzki, Werner and Oertel, Carl-Georg, eds. (2015) Study of deformation texture in an AZ31 magnesium alloy rolled at wide range of rolling speed and reductions. In: 17th International Conference on Textures of Materials (ICOTOM 17) 24–29 August 2014, Dresden, Germany. IOP Conference Series: Materials Science and Engineering, 82 . IOP Publishing, DEU. ISBN 9781510802964 (https://doi.org/10.1088/1757-899X/82/1/012030)

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Abstract

Having the lowest density among all structural metals, magnesium has opened new horizons for developing commercial alloys with successful use in a wide variety of applications [1-2]. However, the plasticity of Mg is restricted at low temperatures because: (a) only a small number of deformation mechanisms can be activated [3-4], and (b) a preferred crystallographic orientation (texture) develops in wrought alloys, especially in flat-rolled sheets [5-7]. Therefore, manufacturing processes such as rolling and stamping should be performed at elevated temperatures [1, 8]. These barriers to the manufacturing process increase the price of magnesium wrought alloy products and limits the use of Mg to castings [9-10]. As a result, many studies have been conducted to improve formability by investigating the effect of manufacturing process. Therefore the current sheet production techniques, based on DC casting and hot rolling, are basically slow because the demand is easily met [11]. Twin roll casting followed by hot rolling appears to be processing route which can fulfil high volumes and reduced costs. The present authors succeeded in single-pass large draught rolling of various magnesium alloy sheets at low temperature (<473K) by high speed rolling [12]. Based on the data available in those works [13- 17], the sheet obtained by high-speed rolling exhibited a fine-grained microstructure (mean grain size of 2-3 μm), with good mechanical properties. For these advantages, the high speed rolling is a promising process to produce high-quality rolled magnesium alloy sheets at a low cost. For these advantages, the HSR is a promising process to produce high-quality rolled magnesium alloy sheets at a low cost. The goal of this research is thus to investigate the mechanisms responsible for the much higher rollability and the grain refinement after HSR. To do that, in this study, different rolling speeds from 15 to 1000 m/min were employed to twin rolled cast AZ31B magnesium alloy and different reductions.

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