1. Uncovering dominant mechanisms of nano-mechanical properties of AlTaO4 ceramics from structural characteristics.
- Author
-
Wang, Jiankun, Chen, Lin, Li, Baihui, Zhang, Luyang, Xue, Guiyu, Zhang, Di, Xu, Bin, Ren, Zhiyi, Wang, Meng, Yan, Shixiao, Sun, Xiaoliang, Liu, Chi, and Feng, Jing
- Subjects
- *
YOUNG'S modulus , *FRACTURE toughness , *WEAR resistance , *CHEMICAL bond lengths , *BOND strengths - Abstract
This investigation comprehensively examines the nano - mechanical properties of AlTaO 4 for the first time, including Young's modulus (E), hardness (H), and fracture toughness (K IC). Variability in the regional distribution of E and H within AlTaO 4 is elucidated through an examination spanning both the grain and bulk material scales, and offers a correlational equation of E and H from fit statistical outcomes. Additionally, the H/E ratio and micro-hardness dissipation parameter of AlTaO 4 reach 0.063 and 0.61, respectively, which demonstrate its exceptional wear resistance. Further investigation emphasizes that the distinctive crystalline structure, short bond lengths, high bond strength, and elevated charge density around aluminum ions significantly contribute to the high E (208 GPa) and H (13.1 GPa) of AlTaO 4. The capacity for energy absorption during elastic deformation enhances crack formation energy and contributes to the relatively high fracture toughness (2.6 MPa m1/2) of AlTaO 4. This work elucidates the excellent mechanical properties of AlTaO 4 by applying nanoindentation and first-principle calculation, which will advance the applications of AlTaO 4 as high-temperature materials. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF