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用两种会聚束电子衍射 (CBED)技术研究了复合材料界面残余应变场。常规正焦CBED方法中 ,用优化算法使计算的高阶Laue带 (HOLZ)线图与实验图达到最佳拟合 ,进而确定残余应变。给出了一种减少优化计算中可调参数数目的方法。残余应变与表面弛豫引起的界面附近点阵平面面间距的变化、点阵平面的旋转与弯曲使得离焦的大角度会聚束电子衍射(LACBED)图中的衍射线移位、分裂与弯曲。表面弛豫引起的点阵平面的旋转也决定于本征应变。通过使动力学理论计算的LACBED图与实验图达最佳拟合 ,可以确定本征应变。用该方法研究了颗粒增强复合材料Al2 O3 Al与晶须增强复合材料(K2 O·6TiO2 )w Al的界面残余应变场
Two types of convergent beam electron diffraction (CBED) technique were used to study the residual strain field in the interface of composites. In the normal CBED CBED method, an optimal algorithm is used to get the best fit between the calculated high-order Laue band (HOLZ) diagram and the experimental image, and then the residual strain is determined. A method to reduce the number of tunable parameters in optimization calculation is given. Residual strain and surface relaxation caused by changes in the lattice plane spacing near the interface, the lattice plane of rotation and bending of the defocused large angle convergent beam electron diffraction (LACBED) diffraction line diffraction shift, splitting and bending. The lattice plane rotation due to surface relaxation also depends on the intrinsic strain. The intrinsic strain can be determined by best fitting the LACBED diagram calculated by kinetic theory to the experimental plot. The interfacial residual strain field of particle reinforced Al 2 O 3 Al and whisker reinforced composite (K 2 O · 6TiO 2) w Al was studied by this method.