通过热力模拟压缩试验研究Ag/SnO_2复合材料在不同变形条件下的流变应力行为,并根据试验数据确定再结晶动力学方程及再结晶晶粒尺寸方程中的材料参数,经过有限元模拟得出反应合成法制备的Ag/SnO_2复合材料在挤压过程中的晶粒尺寸演变情况及最终晶粒尺寸.与实际挤压后试样的电镜照片进行对比,模拟结果与实验吻合,揭示了挤压过程晶粒尺寸变化的机制和变化特征.
The flow stress behavior of Ag/SnO_2 composite under different deformation condition was investigated by isothermal constant speed compression test, and then the parameters of the kinetic equation of dynamic reerystallization and the equation of the recrystallized grain size were identified according to the experimental data. By finite element simulation of extrusion process, the grain-size evolution and final grain size of Ag/SnO_2 composite by reactive synthesis were obtained. Compared with SEM images of extruded sample, it is found that the process simulation is well consistent with the experiment. Finally, the change mechanism and characteristic for the grain size in the extrusion process were revealed.
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