Polycrystalline materials are materials that are made up of multiple small crystals, or grains, that are randomly oriented and bound together. These materials are highly common in everyday objects and industrial applications, such as metals, ceramics, and some polymers. Research in the field of polycrystalline materials focuses on understanding the behavior of these materials at the atomic and grain level, as well as their mechanical, thermal, and electrical properties. This research can help to develop new materials with improved properties, as well as optimize existing materials for specific applications. Some of the key areas of research in polycrystalline materials include grain boundaries, defects, phase transformations, and the influence of processing techniques on the microstructure and properties of the material. This research is important for industries such as aerospace, automotive, electronics, and construction, where materials with specific properties and performance characteristics are required.