固溶淬火后室温停放对2219-T3铝合金组织和性能的影响

Effect of room temperature parking after solution quenching on microstructure and properties of 2219-T3 aluminum alloy

采用金相观察、室温拉伸以及电子背散射衍射分析等方法,研究了不同工艺条件对2219-T3铝合金板材组织性能的影响。分析结果表明,固溶淬火后经过1~5天的室温停放后,2219铝合金板材经过冷变形达到T3状态,其室温屈服强度随着室温停放时间的延长逐渐提高。此外,T3状态下板材的屈服强度随着冷变形量的增加而增加,然而在达到7%~8%的变形量后,进一步的冷变形对屈服强度的提高影响有限,断后伸长率有所下降。室温停放3天后再冷变形的试样,在强度与塑性之间展现出更好的匹配性。进一步的组织分析表明,经过冷变形后的试样并未改变固溶淬火后形成的再结晶结构,KAM分析显示,在晶粒内部形成了较为均匀的位错分布,确保了T3状态下较大程度上起强化作用的原子团簇的保留。

Effect of different processes on microstructure and properties of 2219-T3 aluminum alloy plates was studied by metallographic observation,room temperature tensile and electron backscatter diffraction analysis.The analysis results indicate that,following by 1-5 days of room temperature parking,the solution quenched 2219 aluminum alloy plate achieves the T3 state after undergoing cold deformation,and its yield strength at room temperature progressively increases with the prolongation of natural aging time.Additionally,the yield strengths of the plates in the T3 state increase with the increase of cold deformation;however,after reaching a deformation of 7%-8%,further cold deformation has a limited effect on the increase in yield strength,and the elongation decreases.The specimens after room temperature parking for 3 days and then cold deforming show a better match between strength and plasticity.Further microstructure analysis shows that the specimens after cold deformation do not change the recrystallized structure formed in the solid solution,and KAM analysis shows that a more homogeneous distribution of dislocations is formed within the grains,which ensure the retention of the atomic clusters that play a greater role in strengthening in the T3 state.