Abstract
Friction Stir Welding (FSW) of thick extruded plates is crucial for its application in robust aerospace and automotive structures. However, the FSW of plates greater than 10 mm thickness poses many challenges due to the thermal disparity in the shoulder and pin-affected regions. This causes the micro-structural disparity across the weld structure leading to decreased joint performance. Grain size variation across the weldment is an important factor that reflects such deviations across the welded structure. Therefore, in this study, FSW of 15.4 mm thick AA2519 alloy was conducted to analyse the alterations in grain size at different locations in the stirred region. The variation in grain morphology was studied from the perspective of plastic deformation undergone by the base material at these locations, and prevalent thermal conditions. Copyright (C) 2022 Elsevier Ltd. All rights reserved. Selection and peer-review under responsibility of the scientific committee of the International Conference on Advances in Materials and Mechanical Engineering. (ICAMME-2022).