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对Al-Mg-Si合金搅拌摩擦焊焊核区组织进行了差热扫描量热分析(DSC),同时运用EBSD和TEM观察了焊核区的微观组织,并对存储能进行了定量分析.研究表明,焊核区为不稳定组织,焊核区组织中小角度晶界占42%,大角度晶界占58%,同时晶粒内部分布有较高密度的位错结构.焊核区含有较高的存储能(8.565 J/g),通过EBSD对焊核区较高存储能进行了定量分析,结果表明,位错存储在晶界和亚晶界的能量为0.0247 J/g,存储在晶粒内部的能量为0.0712 J/g.通过DSC定量分析的能量释放来自于焊核区晶粒内部位错的消失和析出相的析出,其中由析出相析出所造成的能量释放占主导作用,位错存储在晶界和亚晶界的存储能通过DSC加热并未释放.
Differential scanning calorimetry (DSC) was performed on the friction-weld zone of the Al-Mg-Si alloy, and the microstructure of the weld zone was observed by EBSD and TEM, and the storage energy was quantitatively analyzed. The results show that the weld zone is unstable, the weld zone nucleus accounts for 42% of the small-angle grain boundaries, the high-angle grain boundaries account for 58%, and the grains are distributed in a higher density dislocation structure. (8.565 J / g). Quantitative analysis of the higher storage energy in the weld zone by EBSD shows that the energy stored in the grain boundaries and the subgrain boundaries is 0.0247 J / g, and the energy stored in the grains The internal energy was 0.0712 J / g. The energy release from DSC quantification was due to the disappearance of dislocations within the grain boundaries and the precipitation of the precipitates, of which the energy release due to precipitation of the precipitates was predominant, dislocations Storage stored at grain boundaries and subgrain boundaries can not be released by DSC heating.