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Effect of compositions on the quenching sensitivity of 7050 and 7085 alloys

机译：成分对7050和7085合金淬火敏感性的影响

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摘要

The requirement for large aircraft components to have Al-Zn-Mg-Cu alloys with high strength and low quenching sensitivity has been increasing. The quenching sensitivity of 7085 and 7050 alloys used for thick plate applications was characterized via hardness tests and microstructure observation. A quenching precipitation model was established to predict the evolution of grain boundary and in-tragranular precipitates during air quenching process, and the effect of composition on the quenching precipitation behavior was investigated using this model. The quenching precipitation kinetic results show that the 7085 alloy has a low quenching sensitivity because the density of the precipitates in the Al_3Zr dispersoids and at the grain boundary is lower compared with that of the 7050 alloy. This result is in agreement with experimental results. Furthermore, the thermodynamic calculation results illustrate that the increase in the Zn/Mg ratio and the decrease in Cu element cause the a phase region to expand, thereby reducing the quenching sensitivity of the 7085 alloy.
机译：对大型飞机部件使用具有高强度和低淬火敏感性的Al-Zn-Mg-Cu合金的需求不断增加。通过硬度测试和微观结构观察来表征用于厚板应用的7085和7050合金的淬火敏感性。建立了淬火沉淀模型以预测空气淬火过程中晶界和晶内析出物的演变，并利用该模型研究了成分对淬火沉淀行为的影响。淬火沉淀动力学结果表明7085合金具有较低的淬火敏感性，因为与7050合金相比，Al_3Zr分散质中和晶界的沉淀密度更低。该结果与实验结果一致。此外，热力学计算结果表明，Zn / Mg比的增加和Cu元素的减少导致a相区域扩大，从而降低了7085合金的淬火敏感性。

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