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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/Si C_p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/Si C_p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/_3Si C_p/2Mg复合材料的再结晶内耗峰峰温高于Al-Mg-Si/_3SiC_p复合材料的再结晶内耗峰峰温。
The effects of two different Mg contents on cold deformation Al-Mg-Si / Si C_p composites were studied by means of internal friction, high angle annular dark field scanning electron microscopy (HADDF-STEM) and high resolution transmission electron microscopy Recrystallization nucleation process. The experimental results show that the solute atoms in the solid solution cold deformed Al-Mg-Si / Si C_p composites are connected with dislocations to form solute atomic air masses. In the process of recrystallization, the amount of solute atomic air masses associated with dislocations in the composites with higher Mg content is more, which hinders the nucleation process of the recrystallization of the composites. Therefore, Al-Mg-Si / The internal friction peak temperature of recrystallization of _3Si C_p / 2Mg composites is higher than that of Al-Mg-Si / _3SiC_p composites.