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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Correlation between stress corrosion cracking resistance and grain-boundary precipitates of a new generation high Zn-containing 7056 aluminum alloy by non-isothermal aging and re-aging heat treatment
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Correlation between stress corrosion cracking resistance and grain-boundary precipitates of a new generation high Zn-containing 7056 aluminum alloy by non-isothermal aging and re-aging heat treatment

机译：非等温老化和再老化热处理新一代高锌7056铝合金的应力腐蚀抗裂性与晶界沉淀的相关性

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摘要

The new generation high Zn-containing 7xxx series aluminum alloys were more prone to stress corrosion cracking (SCC) compared with the traditional 7xxx series aluminum alloys. However, the effect of grain boundary precipitates (GBPs) characteristics, especially microchemistry, on SCC of new generation high Zn-containing 7xxx series aluminum alloys were not investigated in sufficient detail. In the paper, the GBPs characteristics of a new generation high Zn-containing 7056 aluminum alloy were prepared by different aging heat treatments. The morphology and microchemistry of GBPs were analyzed by transmission electron microscope equipped with super-X energy disperse spectroscopy. The stress intensity factor (Kr) and SCC propagation velocity(v) were measured by double cantilever beam (DCB) experiment. The correlations between the GBPs microchemistry and SCC resistance had been discussed. The results showed that the SCC resistance of a new generation high Zn-containing 7056 aluminum alloy was significantly improved by high termination temperature non-isothermal aging and re-aging heat treatment compared with T6 and T77 aging heat treatment. In addition, it was indicated that the SCC resistance was positively with the Cu content of GBPs. (C) 2020 Elsevier B.V. All rights reserved.
机译：与传统7xxx系列铝合金相比，新一代高锌7xxx系列铝合金更容易发生应力腐蚀开裂（SCC）。然而，晶界析出物（GBPs）特性，尤其是微化学特性对新一代高锌7xxx系列铝合金应力腐蚀开裂的影响尚未得到足够详细的研究。本文采用不同的时效热处理方法，制备了新一代高锌7056铝合金的GBPs特性。利用透射电子显微镜和super-X能谱仪对GBPs的形貌和微化学进行了分析。通过双悬臂梁（DCB）实验测量了应力强度因子（Kr）和应力腐蚀开裂扩展速度（v）。讨论了GBPs微化学与抗应力腐蚀性之间的关系。结果表明，与T6和T77时效热处理相比，高终温非等温时效和再时效热处理显著提高了新一代高锌7056铝合金的抗应力腐蚀性能。此外，还表明抗应力腐蚀性能与GBPs的铜含量呈正相关。（C） 2020爱思唯尔B.V.版权所有。

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