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利用SAXS技术对蠕变过程中不同尺度范围的微观结构变化分析表明X射线小角散射(SAXS)与中子小角散射(SANS)测量的二维散射图具有明显的差异,由散射强度曲线的变化说明了蠕变过程中二次析出γ′相形貌和不同区域尺寸特征的改变情况.分析结果表明二次析出γ′相存在两类特征尺寸,在蠕变过程中沿[100]或[010]方向的变化趋势类似,均是在第一和第二阶段有所减小,在第三阶段又有所增大,相较而言,特征尺寸较大的γ′相变化也较为显著.二次析出γ′相在蠕变第二阶段元素扩散最严重,相表面最粗糙,在第三阶段两相界面又进一步明锐;进一步分析表明随蠕变时间增加由于颗粒增大或总量减小,二次析出γ′相与基体相的界面总面积逐渐减小.
Analysis of microstructural changes in different scales in the course of creep using SAXS shows that there is a significant difference between the two-dimensional scattergrams measured by small-angle X-ray scattering (SAXS) and small-angle neutron scattering (SANS) The results show that there are two kinds of feature sizes in the γ ’phase of the second precipitation, and along the [100] or [010] direction during the creep process, The trend of change is similar, both in the first and the second phase have decreased, and in the third phase has increased, compared with the larger feature size γ ’phase change is also more significant .Secondary In the second stage of creep, the element precipitated is the most serious element with the coarsest surface phase. In the third stage, the two-phase interface is further sharp. Further analysis shows that as the creep time increases, the particle size increases or the total volume decreases. The total interfacial area between the γ ’phase and the matrix precipitates decreases gradually.