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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 >Effects of quenching rate and over-aging on microstructures, mechanical properties and corrosion resistance of an Al-Zn-Mg (7046A) alloy
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Effects of quenching rate and over-aging on microstructures, mechanical properties and corrosion resistance of an Al-Zn-Mg (7046A) alloy

机译：淬火率和过度老化对Al-Zn-Mg（7046A）合金的微观结构，力学性能和耐腐蚀性的影响

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摘要

To provide insight to the relationships between quenching rate and aging treatment on the microstructure and properties of Al-Zn-Mg alloys, 7046 A alloy, a low Cu-content commercial Al-Zn-Mg alloy, was selected in the present study. As-received hot-extruded 7046 A alloys were quenched in air and room temperature water and then aged at 120 degrees C for 0-120 h. The mechanical behavior, corrosion resistance and microstructures of the aged alloy were compared and analyzed. The experiment result shows that quenching rate exhibits a greater influence on the precipitates and precipitation free zones (PFZs) of aged alloys than over-aging treatment and the reasons have been discussed. The eta equilibrium phases preferentially take the Al3Zr and Al6Mn dispersoids as the heterogeneous nucleation core and grow quickly inside the grains during the slow cooling process. Over-aging treatment would broaden the grain boundary PFZ and the space of grain boundary precipitates, thus improving the corrosion resistance of water quenched alloys, while it is harmful to air quenched (AQ) alloys. Pitting resistance can be summarized as: AQ24 < AQ120 < AQ60, WQ24 < WQ60 < WQ120. The yield strength, ultimate tensile strength, and elongation the T6 treated WQ alloys (similar to 120 degrees C/24 h) are similar to 532 MPa, similar to 568 MPa, similar to 12.4%, respectively; and the corresponding values of T6 treated AQ alloys (similar to 120 degrees C/60 h) are similar to 475 MPa, similar to 521 MPa, similar to 11.4%. Long-term over-aging (120 degrees C/120 h) has little effect on the hardness, while the tensile properties decrease by similar to 5-6% compared to T6 treatment. (C) 2020 Elsevier B.V. All rights reserved.
机译：为了深入了解淬火速度和时效处理对Al-Zn-Mg合金微观结构和性能的影响，本研究选择了一种低铜含量的商用Al-Zn-Mg合金7046 A。热挤压7046A合金在空气和室温水中淬火，然后在120℃下时效0-120小时。对时效合金的力学性能、耐蚀性和显微组织进行了比较和分析。实验结果表明，淬火速度对时效合金的析出物和无析出区（PFZ）的影响大于过时效处理，并对其原因进行了讨论。eta平衡相优先以Al3Zr和Al6Mn分散体为异相成核核心，在缓慢冷却过程中在晶粒内快速生长。过时效处理会拓宽晶界PFZ和晶界析出物的空间，从而提高水淬合金的耐蚀性，但对空淬（AQ）合金有害。耐点蚀性可概括为：AQ24

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