Analysis of effects of fine nanoparticles and grain boundary character distribution on abnormal grain growth in friction stir welded material

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In the friction stir welded (FSW) material, the abnormal grain growth (AGG) often occurs in the microstructure of the weld zone during the post-FSW heat treatment. In this study, the influence of microstructural features on GG was investigated to prevent the AGG. The addition of fine nanoparticles was effective for preventing the AGG. And also it was considered to prevent GG by controlling the grain boundary character distribution by the optimization of welding condition. In addition, it was confirmed that the grain size can be controlled by adjusting the alloying element and the purity level. It is concluded that these results are very important to improve a reliability of FSWed material.