Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 737, Issue -, Pages 401-412Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2018.09.017
Keywords
Aluminium alloys; Thermomechanical processing; Mechanical properties; Precipitation; Deformation structure; Ageing
Categories
Funding
- Ministry of Education and Science of the Russian Federation [14.584.21.0023, REMEFI58417X0023]
Ask authors/readers for more resources
The effect of tensile strain ranging from 1% to 7% on the decomposition sequence and mechanical properties of an AA2519 alloy with low Si content is studied. Pre-straining promotes the precipitation of theta'- and Omega(1)-phases at dislocations and suppresses the precipitation of GP-zones and theta ''-phase. The aspect ratio (AR) of the homogeneously nucleated Omega(1)-phase is higher than that of the Omega(n)-phase nucleated on the theta'-phase/A1 interfaces by a factor of similar to 4. Replacement of theta ''-phase by a dispersion of theta'- and Omega(n)-phases took place under peak-ageing condition and thus imparted only a minor hardening effect, despite a seven-fold increase in the volume fraction of the strengthening precipitates. An increase in the yield stress by 30% with increasing pre-strain from 1% to 7% is attributed to an increase in the lattice dislocation density. Over-ageing leads to replacement of the Omega(11)-phase by the theta'-phase.
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