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Effect of Cooling Rate on Precipitation Behavior of Al–7.65Zn–2.59Mg–1.95Cu Alloy with Minor Elements of Zr and Ti

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Abstract

We investigate the effect of cooling rate on the precipitation behavior during cooling from solution treatment temperature and post-aging of a high-strength Al–7.65Zn–2.59Mg–1.95Cu–0.11Zr–0.04Ti extruded alloy. Solution treatment at 450 °C caused the partial dissolution and disintegration of η phase, along with a partial recrystallization of Al grains. The formation of fine L12-type Al3Zr/Al3(Zr,Ti) (~ 20 nm) and relatively large Ti-rich dispersoids (~ 100 nm) took place during extrusion and/or solution treatment processes. The slow cooling from solution treatment temperature (0.3 °C/min) caused the precipitation of η phases on coarse Al3(Zr,Ti) particles (formed during solidification), Ti-rich dispersoids (formed during extrusion/solution treatment), grain boundaries, and grain interiors, thereby resulting in negligible aging responses during post-aging at room and elevated temperatures. During fast cooling at 850 °C/min, however, the η phases did not precipitate and thus the Al matrix remained supersaturated, leading to significant aging responses by the formation of GP zones and metastable η″/η′ precipitates.

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Acknowledgements

This work was supported by the Strategical Materials Program (No. 10062304) of the Ministry of Trade, Industry and Energy, Republic of Korea, and the Fundamental Research Program (PNK5990) funded by the Korea Institute of Materials Science.

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Authors and Affiliations

  1. Metallic Materials Division, Korea Institute of Materials Science, Changwon, 51508, Republic of Korea

    Saif Haider Kayani, Jae-Gil Jung, Min-Seok Kim & Kwangjun Euh

  2. Advanced Materials Engineering, Korea University of Science and Technology (UST), Daejeon, 34113, Republic of Korea

    Saif Haider Kayani & Kwangjun Euh

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  1. Saif Haider Kayani
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  2. Jae-Gil Jung
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Kayani, S.H., Jung, JG., Kim, MS. et al. Effect of Cooling Rate on Precipitation Behavior of Al–7.65Zn–2.59Mg–1.95Cu Alloy with Minor Elements of Zr and Ti. Met. Mater. Int. 26, 1079–1086 (2020). https://doi.org/10.1007/s12540-019-00385-1

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