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Outline
TiAl alloys are regarded as a new generation of high-temperature structural materials with great application potential due to their excellent high-temperature performance. In particular, the deformation behavior of the B2 phase plays a crucial role in the service performance of the alloys. Although the B2 phase is often classified as a room-temperature brittle phase, and its presence often leads to a conflict between hot workability and room-temperature plasticity, recent studies have provided new perspectives for understanding its deformation mechanism. This paper reviews recent research progress on the deformation mechanisms of the B2 phase in TiAl alloys, systematically elucidating the crystallographic characteristics and slip system types, with a focus on the key factors constraining its plastic deformation. Studies have indicated that, under certain conditions, the B2 phase has the potential to activate various dislocation slip systems, including <111>, <110>, and <001>. However, its macroscopic plastic deformation is constrained by multiple factors, including temperature, stress state, internal precipitates (such as the ωo phase), and the surrounding microstructure. Furthermore, by comparing different alloy systems, the influence of ordering degree on slip system selection is discussed, and effective strategies for activating the plasticity of the B2 phase through interface engineering and alloy design are summarized. Finally, the paper provides an outlook on future research directions for further revealing the deformation mechanisms of the B2 phase in TiAl alloys.
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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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