The supplementary materials for the article "Achieving room temperature plasticity in brittle ceramics through elevated temperature preloading" by Chao Shen et al. include detailed TEM micrographs and analysis of defect formation in TiO₂ and Al₂O₃ micropillars under various deformation conditions. The figures (S1 to S8) and tables (S1) provide insights into the microstructural changes, such as dislocation formation, subgrain development, and crack propagation. Movies (S1 to S9) offer visual demonstrations of the deformation processes. The data highlight the effects of elevated temperature preloading on the mechanical behavior and microstructure of these ceramics, showing how it enhances their plasticity and resistance to catastrophic failure at room temperature.The supplementary materials for the article "Achieving room temperature plasticity in brittle ceramics through elevated temperature preloading" by Chao Shen et al. include detailed TEM micrographs and analysis of defect formation in TiO₂ and Al₂O₃ micropillars under various deformation conditions. The figures (S1 to S8) and tables (S1) provide insights into the microstructural changes, such as dislocation formation, subgrain development, and crack propagation. Movies (S1 to S9) offer visual demonstrations of the deformation processes. The data highlight the effects of elevated temperature preloading on the mechanical behavior and microstructure of these ceramics, showing how it enhances their plasticity and resistance to catastrophic failure at room temperature.