Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10156022 | Journal of Alloys and Compounds | 2019 | 21 Pages |
Abstract
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 η phase, and aging led to the precipitation of ηⲠphase in the FSP samples. The Al3(Sc,Zr) particles effectively inhibited the grain coarsening in the Sc-containing FSP sample during the T6 process. Thus, a high density of ηⲠphase 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.
Related Topics
Physical Sciences and Engineering
Materials Science
Metals and Alloys
Authors
C.Y. Liu, B. Zhang, Z.Y. Ma, H.J. Jiang, W.B. Zhou,