Journal
MATERIALS CHARACTERIZATION
Volume 162, Issue -, Pages -Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.matchar.2020.110190
Keywords
Powder hot-extruded 7055 Al alloy; Repetitious RRA; Precipitation evolution; Microstructure; Mechanical properties; Corrosion behavior
Categories
Funding
- Chinese National Key RD Plan [2017YFB0306105]
- Fundamental Research Funds for the Central Universities of Central South University [2018zzts122]
- Chinese National Pre-research Project [41423040204]
- Opening Sharing Fund for the Large-scale Instruments and Equipments of Central South University [CSUZC201912]
Ask authors/readers for more resources
The precipitation evolution, mechanical properties and corrosion behavior of powder hot-extruded 7055 Al alloy treated by repetitious retrogression and re-aging (RRA) were investigated. The results suggest that the dominant intragranular precipitates after different numbers of RRA treatment change from GP zones + eta' phase (RRA1) to eta' phase (RRA2, RRA3) and then to eta' phase + eta phase (RRA4), and both strength and corrosion resistance deteriorate with the increase of RRA repetition times. Transmission electron microscope (TEM) observation indicates that the coarsening and transformation of intragranular precipitates during repetitious RRA treatment induce the decrease of strength, while the increases in the area fraction of grain boundary precipitates (GBPs) and the width of precipitate free zones (PFZs) are detrimental for the corrosion resistance of the alloy. Therefore, the RRA1 treatment can achieve the best comprehensive performance of the powder hot-extruded 7055 Al alloy with excellent strength and good corrosion resistance.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available
Share Paper
