Elasticity, mechanical and thermal properties of submicron h-AlN: in-situ high pressure ultrasonic study
| Autor: | Lei Xie, Qing-Ze Li, Fang Peng, Yongtao Zou, Tiexin Han, Gongzhang Yang, Leiming Fang, Xiping Chen, Xiuxiu Yang, Qiwei Hu |
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| Rok vydání: | 2021 |
| Předmět: |
010302 applied physics
Materials science 02 engineering and technology Nitride Grüneisen parameter 021001 nanoscience & nanotechnology 01 natural sciences symbols.namesake Fracture toughness Thermal conductivity 0103 physical sciences Vickers hardness test Materials Chemistry Ceramics and Composites symbols Ultrasonic sensor Composite material Elasticity (economics) 0210 nano-technology Debye model |
| Zdroj: | Journal of the European Ceramic Society. 41:4788-4793 |
| ISSN: | 0955-2219 |
| Popis: | Compressional (VP) and shear (VS) wave velocities of high pressure (P) and temperature (T) sintered submicron hexagonal aluminum nitride (h-AlN) have been measured up to 15 GPa using ultrasonic interferometry. Using finite strain equation-of-state approaches, yielding KS0 = 293.1 ± 2.9 GPa, G0 = 141.9 ± 1.4 GPa and K′S = 3.72 ± 0.04, G′ = 0.52 ± 0.02. It is found that the Vickers hardness of submicron h-AlN is as high as 11.7 GPa, and its fracture toughness is up to ∼4.25 MPa m1/2. Meanwhile, based on the elastic wave velocities and density data, the elastic-related properties of h-AlN are derived as Debye temperature Θ0 = 1006 K, Gruneisen parameter γ = 1.72 and acoustic thermal conductivity λacoustic = 196 W/mK. These results may provide a comprehensive elasticity and elastic-related properties of submicron h-AlN under high pressure, which may be of great importance for its uses at extreme conditions. |
| Databáze: | OpenAIRE |
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