Article ID Journal Published Year Pages File Type
1579783 Materials Science and Engineering: A 2009 5 Pages PDF
Abstract

Grain growth kinetics of nanostructured Al6061 powder prepared via mechanical milling was studied through isothermal heat treatment. The results showed that after 30 h of milling, the powder was composed of an Al-based supersaturated solid solution with a grain size of 35 nm and lattice strain of 0.43%. Release of lattice strain, intermetallic precipitation and grain growth occurred upon heating of the 30 h-milled powder. Nevertheless, grain growth was very limited and Al grains with size of 50–60 nm were still present after exposure to 550 °C (0.83Tm) for 3 h. The activation energies for the grain growth were found to be 112.3 kJ/mol for annealing at 150–300 °C and 148.4 kJ/mol for annealing at 350–550 °C. Additionally, the isothermal grain growth exponent (n) was obtained in the range of 0.024–0.21.

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