CAJ | 학술논문

采用透射电镜、拉伸试验、剥落腐蚀试验等手段，研究7055铝合金在回归时效阶段的晶界η相形貌、尺寸、间距及其粗化动力学行为，以及对最终材料性能的影响。结果表明：随着回归温度的升高或回归时间的延长，晶界η相不断粗化，间距也不断增大；且回归温度越高，晶界η相粗化速率越快。在本实验条件下，该合金晶界η相的粗化激活能Q=1.13 eV，据此建立晶界相粗化动力学模型。
채용투사전경、랍신시험、박락부식시험등수단，연구7055려합금재회귀시효계단적정계η상형모、척촌、간거급기조화동역학행위，이급대최종재료성능적영향。결과표명：수착회귀온도적승고혹회귀시간적연장，정계η상불단조화，간거야불단증대；차회귀온도월고，정계η상조화속솔월쾌。재본실험조건하，해합금정계η상적조화격활능Q=1.13 eV，거차건립정계상조화동역학모형。
The morphology and coarsening kinetics of grain boundary precipitates (η) in the regression aging stage of 7055 aluminium alloys were studied by transmission electron microscopy (TEM), and the corresponding effects on the mechanical property and corrosion resistance were measured by tensile tests and exfoliation corrosion tests. The results show that the grain boundary precipitates (η) are coarsened and the inter-space increases with the retrogression temperature or retrogression time increasing. The coarsening rate ofη precipitates increases with retrogression temperature increasing. The coarsening activation energy is 1.13 eV, and a modified coarsening kinetics model of grain boundary precipitates was proposed.