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对原位自生6063/TiB_2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~(14)m~(-2)下降为10~(13)m~(-2),较高的残余密度主要是由于TiB_2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旨以刃型位错为主,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。
The in-situ self-generated 6063 / TiB 2 composite was subjected to friction stir processing (FSP), and the processed material was T6 heat-treated. The dislocation density before and after T6 treatment was measured and characterized by synchrotron radiation X-ray diffraction and transmission electron microscopy (TEM). The dislocation types were also analyzed. The results show that after T6 treatment, the dislocation density in the friction stir structure decreases from 10 ~ (14) m ~ (-2) to 10 ~ (13) m ~ (-2), and the higher residual density It is mainly due to the pinning effect of TiB 2 particles on the dislocation movement. T6 treatment before and after the sample to the type of dislocation edge to the main purpose of the dislocation, T6 treatment edge dislocation ratio increased from the original 70% to 90%, indicating that most of the samples in the screw dislocation at high temperature Under the conditions of the reply annihilation, so that the samples left more edge dislocation.