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The (B4C+Al2O3)/Al composite is a critical neutron absorbing material for dry storage systems of spent fuel, and its long−term high temperature service reliability is directly associated with the safety of nuclear waste management. As a structural−functional integrated material, it is susceptible to phase transformation of amorphous Al2O3 (am−Al2O3) into γ−Al2O3 at elevated temperatures, which may adversely affect its mechanical properties. However, the microstructural evolution and long−term properties stability of this composite under prolonged thermal exposure remain insufficiently understood. In this work, (B4C+Al2O3)/Al composites were subjected to stabilization treatments at 400°C for 100 h and 550°C for 8 h, followed by long−term annealing at 400°C for up to 4000 h to evaluate their thermal stability. The results demonstrate that, after stabilization, the composites retained tensile strengths exceeding 220.0 MPa at room temperature and 100.0 MPa at 350°C, satisfying the requirements for engineering applications. Microstructural characterization revealed a partial transformation of am−Al2O3 to γ−Al2O3; however, both the microstructure and mechanical properties exhibited stable behavior during prolonged annealing. These findings indicate that both stabilization treatments effectively enhance the thermal stability of the (B4C+Al2O3)/Al composite, thereby providing a materials science basis for the long−term safe service of dry storage containers for spent fuel.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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