通过内耗、高角环形暗场像扫描透射电子显微镜(HADDF-STEM)和高分辨透射电子显微镜(HRTEM)等技术手段，研究两种不同Mg含量的冷变形Al?Mg?Si/SiCp复合材料的再结晶形核过程。实验结果表明，固溶态冷变形 Al?Mg?Si/SiCp复合材料中溶质原子与位错相联，形成溶质原子气团。在再结晶过程中，Mg 含量较高的复合材料中与位错相联的溶质原子气团的数量更多，对复合材料再结晶形核过程有更大的阻碍作用，因而Al?Mg?Si/3SiCp/2Mg复合材料的再结晶内耗峰峰温高于Al?Mg?Si/3SiCp复合材料的再结晶内耗峰峰温。
The recrystallization nucleation processes of two cold-rolled Al?Mg?Si/SiCpcomposites with different contents of Mg are investigated mainly by dynamic mechanical analyzer (DMA) and electron microscopy including high angle annular dark field scanning transmission electron microscopy (HAADF-STEM) andhigh-resolution transmission electron microscopy (HRTEM). Internal friction and electron microscopy results show that solute atom clusters are present in association with dislocationsin supersaturated cold-rolled composites. During recrystallization process, the internal friction peak position of Al?Mg?Si/3SiCp/2Mg (volume fraction,%) is higher than that of Al?Mg?Si/3SiCp(volume fraction,%) due to more solute atom clusters formed in association with the dislocations in the cold-rolled composite with a much higher Mg content, indicating a strongerresistance for the recrystallization nucleation.
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