Study of Static Recrystallization Behavior of a Mg-6Al-3Sn Alloy
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JMEPEG https://doi.org/10.1007/s11665-019-04104-0
Study of Static Recrystallization Behavior of a Mg-6Al-3Sn Alloy Gaurav Gaurav, R. Sarvesha, Sudhanshu S. Singh, Rajesh Prasad, and Jayant Jain (Submitted August 14, 2018; in revised form March 21, 2019) In this study, the static recrystallization behavior of cold-rolled Mg-6Al-3Sn alloy has been studied during annealing in the temperature range of 200-400 °C. The role of Mg17Al12 precipitation during recrystallization is discerned. A significant drop in the grain size has been reported post-recrystallization. The results suggest that the recrystallization predominately started at the prior grain boundaries and within the twin boundaries. Recrystallization at lower temperatures was found to be incomplete despite holding for a longer duration. However, at higher temperatures, the recrystallization was observed to be complete in shorter times. The role of concurrent precipitation during recrystallization has been ascertained. Keywords
cold rolling, EBSD, grain refinement, magnesium alloy, precipitation, recrystallization
1. Introduction In recent years, magnesium alloys have received tremendous attention owing to the potential of significant weight savings. They are considered to be the promising materials for many applications including portable electronic appliances, aerospace engineering and automotive industries (Ref 1). However, hexagonal close packed (HCP) Mg alloys exhibit poor formability at the ambient temperature due to the limited number of active slip systems (Ref 2). It is known that the formability of these alloys can be enhanced via elevated temperature processing by facilitating the activation of additional deformation modes (Ref 2). Thus, significant efforts have been made to improve the formability of magnesium alloys by conventional thermo-mechanical processing, such as extrusion, rolling and forging (Ref 3). The improvement in the properties can be attributed to the obtained microstructure after dynamic recrystallization (DRX), which results in the significant grain refinement. Additionally, severe plastic deformation processes, such as equal-channel angular pressing (ECAP) (Ref 4), high pressure torsion (Ref 5), asymmetric rolling (Ref 6) and friction stir processing (Ref 7), have been adopted to obtain ultrafinegrained Mg alloys. Although several investigations (Ref 8-14) exist on the DRX behavior of hot-worked magnesium alloys under different processing conditions, a very limited number of studies have been conducted to examine the static recrystallization of cold-rolled magnesium alloy (Ref 15-20). This is primarily due to the limited ductility of magnesium alloys at low temperatures. Nonetheless, with the recent interest in the development of ductile magnesium alloys (Ref 21-25), the Gaurav Gaurav, Rajesh Prasad, and Jayant Jain, Department of Materials Science and Engineering, IIT Delhi, New Delhi 110016, India; and R. Sarvesha and Sudhanshu S. Singh, Department of Materials Science and Engineering, IIT Kanpur, Kanpur, Uttar Pradesh 208016, India.
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