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Outline
Revealing the evolution and deformation mechanisms of interfacial microstructures and defects plays a crucial role in regulating the interfacial microstructures and properties of Al/steel dissimilar joints. However，conventional characterization methods are often inadequate for effectively elucidating the dynamic evolution mechanisms at the interface. This paper reviews the breakthrough progress of synchrotron radiation in-situ characterization techniques in elucidating the interfacial metallurgical reactions and strengthening-toughening mechanisms of Al/steel joints. By utilizing synchrotron radiation X-ray two-dimensional imaging，micro-tomography，and diffraction techniques，in-situ observations are achieved for the heterogeneous dissolution of steel，interfacial diffusion reactions，solidification behavior during Al/steel-liquid/solid interfacial reactions，as well as the deformation behavior of joints under load. These studies have provided deep insights into the growth kinetics and three-dimensional morphological evolution mechanisms of tongue-shaped Fe2Al5，irregular FeAl3，and faceted Si phases at Al/steel interfaces. Furthermore，the geometric morphology and spatial distribution characteristics of pores are remodelled，the evolution of residual stress distribution in components is characterized in-situ，and the mechanisms of crack initiation and propagation in heterogeneous components under loading conditions are clarified. Synchrotron radiation techniques overcome the limitations of traditional two-dimensional static characterization，providing dynamic experimental data for understanding the dissolution-diffusion-solidification processes and damage behavior under load at Al/steel interfaces. Future work should focus on in-situ studies of the metallurgical and mechanical behaviors at Al/steel interfaces under multi-field coupling or complex extreme conditions，as well as the development of intelligent in-situ characterization platforms.
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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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