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通过光学显微镜、扫描电镜及透射电镜研究了热轧工艺对7050铝合金慢速率淬火过程的组织演变规律,并结合电导率及力学性能结果分析了热轧变形参数对合金淬火敏感性的影响。结果表明:变形程度越大合金表现出更差的淬火敏感性,这是因为轧制工艺不同将导致合金再结晶百分数差异,进而对合金淬火敏感性产生影响,根本原因是再结晶晶粒中的Al3Zr粒子作为平衡η相的形核位置将加快合金过饱和固溶体的分解,导致合金后续时效强化效果降低,合金性能损失;合金热处理过程中在保证力学性能的前提下,适当控制轧制变形量可减小再结晶分数,改善合金淬火敏感性。
The microstructure evolution of 7050 aluminum alloy during quenching process was studied by optical microscopy, scanning electron microscopy and transmission electron microscopy. The effects of hot deformation parameters on the quench sensitivity of the alloy were analyzed based on the results of conductivity and mechanical properties. The results show that: the greater the degree of deformation, the alloy shows a worse quench sensitivity, because the rolling process will lead to differences in recrystallization percentage of alloy recrystallization, thereby affecting the quenching sensitivity of the alloy, the fundamental reason is recrystallized grains Al3Zr particles as the equilibrium η phase nucleation sites will speed up the decomposition of supersaturated solid solution alloy, resulting in the subsequent strengthening of the alloy to reduce the aging effect, the alloy performance loss; alloy heat treatment process to ensure the mechanical properties of the premise, the appropriate control of rolling deformation Reduce the recrystallization fraction, improve the quench sensitivity of the alloy.