Effect of Cooling Rate on Precipitation Behavior of Al-7.65Zn-2.59Mg-1.95Cu Alloy with Minor Elements of Zr and Ti
- Authors
- Kayani, Saif Haider; Jung, Jae-Gil; Kim, Min-Seok; Euh, Kwangjun
- Issue Date
- Jul-2020
- Publisher
- KOREAN INST METALS MATERIALS
- Keywords
- Aluminum alloy; Precipitation; Microstructure; Transmission electron microscopy (TEM)
- Citation
- METALS AND MATERIALS INTERNATIONAL, v.26, no.7, pp.1079 - 1086
- Journal Title
- METALS AND MATERIALS INTERNATIONAL
- Volume
- 26
- Number
- 7
- Start Page
- 1079
- End Page
- 1086
- URI
- https://scholarworks.bwise.kr/gachon/handle/2020.sw.gachon/80186
- DOI
- 10.1007/s12540-019-00385-1
- ISSN
- 1598-9623
- Abstract
- We investigate the effect of cooling rate on the precipitation behavior during cooling from solution treatment temperature and post-aging of a high-strength Al-7.65Zn-2.59Mg-1.95Cu-0.11Zr-0.04Ti extruded alloy. Solution treatment at 450 degrees C caused the partial dissolution and disintegration of eta phase, along with a partial recrystallization of Al grains. The formation of fine L1(2)-type Al3Zr/Al-3(Zr,Ti) (~20 nm) and relatively large Ti-rich dispersoids (~100 nm) took place during extrusion and/or solution treatment processes. The slow cooling from solution treatment temperature (0.3 degrees C/min) caused the precipitation of eta phases on coarse Al-3(Zr,Ti) particles (formed during solidification), Ti-rich dispersoids (formed during extrusion/solution treatment), grain boundaries, and grain interiors, thereby resulting in negligible aging responses during post-aging at room and elevated temperatures. During fast cooling at 850 degrees C/min, however, the eta phases did not precipitate and thus the Al matrix remained supersaturated, leading to significant aging responses by the formation of GP zones and metastable eta ''/eta precipitates.Graphical Abstract
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