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Saif Haider Kayani,Jae‑Gil Jung,Min‑Seok Kim,Kwangjun Euh 대한금속·재료학회 2020 METALS AND MATERIALS International Vol.26 No.7
We investigate the effect of cooling rate on the precipitation behavior during cooling from solution treatment temperatureand post-aging of a high-strength Al–7.65Zn–2.59Mg–1.95Cu–0.11Zr–0.04Ti extruded alloy. Solution treatment at 450 °Ccaused the partial dissolution and disintegration of η phase, along with a partial recrystallization of Al grains. The formationof fine L12-type Al3Zr/Al3(Zr,Ti) (~ 20 nm) and relatively large Ti-rich dispersoids (~ 100 nm) took place during extrusionand/or solution treatment processes. The slow cooling from solution treatment temperature (0.3 °C/min) caused theprecipitation of η phases on coarse Al3(Zr,Ti) particles (formed during solidification), Ti-rich dispersoids (formed duringextrusion/solution treatment), grain boundaries, and grain interiors, thereby resulting in negligible aging responses duringpost-aging at room and elevated temperatures. During fast cooling at 850 °C/min, however, the η phases did not precipitateand thus the Al matrix remained supersaturated, leading to significant aging responses by the formation of GP zones andmetastable η″/η′ precipitates.