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Precipitation kinetics in warm forming of AW-7020 alloy

机译：AW-7020合金温成形的析出动力学。

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摘要

The warm formability of the precipitation hardening AW-7020 (AlZn 4.5Mg1) alloy is investigated by testing extruded tubes. The precipitation kinetics of different conditions before and after warm deformation is studied by differential scanning calorimetry and transmission electron microcopy. The precipitation conditions are correlated with the results of hardness tests at room temperature and of tensile tests at temperatures between 200 and 350 ℃ at different strain rates. The yield strength decreases with increasing test temperature approaching that of samples in the annealed condition, while the strain at fracture increases. The overall influence of the strain rate on ductility is dominated by the corresponding time required for deformation. The formability of the starting condition Tl as well as the corresponding strain hardening exponent is particularly promising for high strain rates at 250 ℃, where the metastable precipitates of the Tl condition are dissolved. The short exposure of about 30 s at 250 ℃ re-establishes the potential for precipitation strengthening by natural ageing after the warm deformation and a following paint baking heat treatment maintains the hardness level.
机译：通过测试挤压管研究了沉淀硬化AW-7020（AlZn 4.5Mg1）合金的热成形性。通过差示扫描量热法和透射电镜研究了热变形前后不同条件下的沉淀动力学。在不同应变速率下，沉淀条件与室温下的硬度测试结果和200至350℃之间的拉伸测试结果相关。屈服强度随着测试温度的升高而接近退火状态下的样品，而降低，而断裂应变增加。应变率对延展性的总体影响主要取决于变形所需的时间。起始条件T1的可成形性以及相应的应变硬化指数对于在250℃时高的应变速率（其中溶解了T1条件的亚稳态沉淀物）特别有希望。在250℃下约30 s的短暂暴露重新确立了在热变形后自然老化导致的沉淀强化的潜力，并且随后的油漆烘烤热处理保持了硬度水平。

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