CAJ | 학술논문

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.
통과열력모의압축시험연구Ag/SnO_2복합재료재불동변형조건하적류변응역행위,병근거시험수거학정재결정동역학방정급재결정정립척촌방정중적재료삼수,경과유한원모의득출반응합성법제비적Ag/SnO_2복합재료재제압과정중적정립척촌연변정황급최종정립척촌.여실제제압후시양적전경조편진행대비,모의결과여실험문합,게시료제압과정정립척촌변화적궤제화변화특정.
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.