Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 772, Issue -, Pages 775-781Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2018.09.109
Keywords
Al alloy; Microstructure; Damping capacity; Mechanical properties
Categories
Funding
- National Natural Science Foundation of China [51601045]
- Guangxi Bagui Teams for Innovation and Research
- Guangxi Natural Science Foundation [2016GXNSFDA380028]
- Science and Technology Major Project of Guangxi [GKAA17202007]
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Sc addition, friction stir processing (FSP), and subsequent solid-solution treatment and aging to peak hardness (T6 treatment) were applied on a 7055 Al alloy. Fine equiaxed grains were obtained after FSP, and the size of the grains was further refined by minor Sc addition. Subsequent solid-solution treatment led to the dissolution of eta phase, and aging led to the precipitation of eta' phase in the FSP samples. The Al-3(Sc,Zr) particles effectively inhibited the grain coarsening in the Sc-containing FSP sample during the T6 process. Thus, a high density of eta' phase and a fine equiaxed grain structure were obtained in the Sc-containing 7055 alloy after FSP and T6 treatment. The special structure endowed this alloy with higher yield strength than the T6 treated 7055 alloy. FSP enhanced the high-temperature internal friction value of the Sc-containing 7055 alloy, and subsequent T6 treatment did not significantly reduce the value. The Sc-containing 7055 alloy exhibited greater high-temperature internal friction value than the T6 samples and the 7055 alloy fabricated using the same processing route. (C) 2018 Elsevier B.V. All rights reserved.
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