7055鋁合金晶界η相回歸階段的粗化動力學Coarsening kinetics of grain boundary precipitates in 7055 aluminium alloy

采用透射電鏡、拉伸試驗、剝落腐蝕試驗等手段，研究7055鋁合金在回歸時效階段的晶界η相形貌、尺寸、間距及其粗化動力學行為，以及對最終材料性能的影響。結(jié)果表明：隨著回歸溫度的升高或回歸時間的延長，晶界η相不斷粗化，間距也不斷增大；且回歸溫度越高，晶界η相粗化速率越快。在本實驗條件下，該合金晶界η相的粗化激活能Q=1.13 eV，據(jù)此建立晶界相粗化動力學模型。

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 of η 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.

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