中文摘要：

对原位自生6063／TiB2复合材料进行了搅拌摩擦加工（FSP），并对加工后的材料进行了T6热处理。使用同步辐射X射线衍射及透射电镜（TEM）对T6处理前后的位错密度进行了定量表征估算，并对位错类型进行了分析。结果表明，在进行T6处理后，搅拌摩擦组织中的位错密度由原来的10^14m^-2下降为10^13m^-2较高的残余密度主要是由于TiB2颗粒对位错运动所起的钉扎作用。T6处理前后样品的位错类型皆以刃型位错为主，T6处理则使刃型位错的比例从原来的70％上升为90％，这说明样品中的大部分螺型位错在高温条件下发生了回复湮灭，因而使样品中残余了较多的刃型位错。

英文摘要：

The friction stir processing （FSP） was conducted on in-situ 6063/TiB2 composite and then, subsequent T6 treatment was carried out. Quantitative analysis on dislocation density were completed by synchrotron X-ray diffraction and transmission electron microscopy（TEM） characterization. Then, the dislocation type was analyzed. The results show that： after T6 treatment, the dislocation density has droped from magnitude of 10^14 m^-2 to 10^13 m^-2, such a small loss of dislocation is mainly due to the pinning effect on the dislocation movement exerted by TiB2 particles. Meanwhile, it was found that both samples before and after T6 treatment are mainly composed of edge dislocation, and T6 treatment has introduced a rise on the proportion of edge dislocation from 70% to 90%, which indicate that screw dislocations are more likely to be annihilated at elevated temperatures during FSP, then, there are more residual edge dislocations in the samples.