In the last four decades, grain boundary engineering (GBE) of both metallic materials and ceramics has evolved as a methodology to optimise the different properties of these materials based on replacing high-energy random high-angle GBs (HAGBs) with low-energy GBs , . Particularly, in the context of metallic materials with mostly cubic crystal structures, GBE has been defined as a methodology to replace HAGBs with special HAGBs (with low-energy) also known as Coincidence Site Lattice (CSL) boundaries - . The entire methodology of GBE is based on reducing the overall GB energy in a microstructure so as to make the 2D interfaces (GBs and IBs) resistant to corrosion, oxidation, abnormal grain growth and intergranular fracture. Moreover, the most common method to obtain GBE microstructures in most metallic materials is thermo-mechanical processing (TMP) . In the context of ceramics with more complex crystal structures, CSL theory fails and hence, the existence of low-energy CSL boundaries is hard to visualise - . Furthermore, the techniques used (especially TMP) to obtain GBE microstructures in metallic materials cannot be used in ceramics owing to their low deformability both at room and elevated temperatures. Hence, there lies a huge challenge in obtaining GBE microstructures in AZ ceramics. This also paves a new avenue of research in the context of AZ ceramics. In addition, one of the most recently evolved methodologies towards correlating the structure of GBs and interphase boundaries (IBs) with their local atomic-scale composition (in polycrystalline materials) is Correlative Microscopy , . Particularly, in the context of metallic materials, this methodology has been extensively used to study both the structure and composition of GBs and also to address the five macroscopic and three microscopic degrees of freedom (DOFs) (of GBs and IBs). However, in the context of AZ ceramics, there is hardly any correlative microstructural investigation till date. This may be attributed to the complexity associated with crystal structures and sample preparation. Moreover, as mentioned in section 1, laser AM-based techniques are based on layer-by-layer deposition of materials. This adds up to the complexity (in terms of obtaining GBE microstructures) by inducing large-scale microstructural heterogeneities (with high defect concentration) , resulting in non-equilibrium microstructures. Hence, obtaining GBE microstructures in AM-based AZ ceramics provides an immense potential towards future investigations in field of AZ ceramics.