Journal
MATERIALS CHARACTERIZATION
Volume 102, Issue -, Pages 122-130Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.matchar.2015.02.016
Keywords
7150 aluminum alloy; Al3Zr dispersoids; Two-step homogenization; Recrystallization
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Funding
- Natural Sciences and Engineering Research Council of Canada (NSERC)
- Rio Tinto Alcan through the NSERC Industrial Research Chair in Metallurgy of Aluminum Transformation at the University of Quebec at Chicoutimi
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The effect of two-step homogenization treatments on the precipitation behavior of Al3Zr dispersoids was investigated by transmission electron microscopy (TEM) in 7150 alloys. Two-step treatments with the first step in the temperature range of 300-400 degrees C followed by the second step at 470 degrees C were applied during homogenization. Compared with the conventional one-step homogenization, both a finer particle size and a higher number density of Al3Zr dispersoids were obtained with two-step homogenization treatments. The most effective dispersoid distribution was attained using the first step held at 300 degrees C. In addition, the two-step homogenization minimized the precipitate free zones and greatly increased the number density of dispersoids near dendrite grain boundaries. The effect of two-step homogenization on recrystallization resistance of 7150 alloys with different Zr contents was quantitatively analyzed using the electron backscattered diffraction (EBSD) technique. It was found that the improved dispersoid distribution through the two-step treatment can effectively inhibit the recrystallization process during the post-deformation annealing for 7150 alloys containing 0.04-0.09 wt.% Zr, resulting in a remarkable reduction of the volume fraction and grain size of recrystallization grains. (C) 2015 Elsevier Inc. All rights reserved.
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