Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 391, Issue 1-2, Pages 367-376Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2004.09.013
Keywords
aluminum alloy 7055; ingot casting; annealing; T(AlMg3Zn3) and S(Al2CuMg) phases; electron probe microanalysis; X-ray diffraction
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Aluminum alloys, encompassed by AA 7055 alloy composition, having the nominal zinc content (i.e. 8 wt.%) but varying copper and magnesium contents across the alloy composition range were examined in the as-cast form by a combination of light microscopy, scanning electron microscopy (SEM), electron probe micro analysis (EPMA) and X-ray diffraction (XRD). It is observed that for all compositions, the second phases based on eta(MgZn2), T(Al2Mg3Zn3) and S(Al2CuMg) are present. The T phase dissolves copper up to 28 wt.%, whilst the S phase shows metastable solubility of zinc that may range up to 30 wt.%. In alloys with magnesium at the lower limit and the copper contents approaching the upper limit of the alloy composition, the theta phase (Al2Cu) of the constituent binary Al-Cu system is further observed. The theta phase (Al2Cu) does not dissolve either zinc or magnesium. Below the nominal composition, the alloys could be homogenized substantially using a commercially viable homogenization treatment leaving small amounts of undissolved S phase that does not contain any zinc. (C) 2004 Elsevier B.V. All rights reserved.
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