期刊
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
卷 525, 期 1-2, 页码 107-111出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2009.06.051
关键词
Al6061 alloy; Grain growth; Nanostructured materials; Mechanical milling
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 degrees 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 degrees C and 148.4 kJ/mol for annealing at 350-550 degrees C. Additionally, the isothermal grain growth exponent (n) was obtained in the range of 0.024-0.21. (C) 2009 Elsevier B.V. All rights reserved.
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