Journal
METALS
Volume 8, Issue 4, Pages -Publisher
MDPI
DOI: 10.3390/met8040265
Keywords
EN AW-6082; AlMgSi alloy; solution treatment; solution temperature; differential scanning calorimetry (DSC); scanning electron microscopy (SEM); continuous cooling precipitation; quench sensitivity; complete solution; incomplete dissolution
Funding
- German Research Foundation (DFG) [DFG RE3808/2-1, DFG SA 960/7-1]
Ask authors/readers for more resources
We use a systematic approach to investigate the influence of the specific solution condition on quench-induced precipitation of coarse secondary phase particles during subsequent cooling for a wide range of cooling rates. Commercially produced plate material of aluminum alloy EN AW-6082 was investigated and the applied solution treatment conditions were chosen based on heating differential scanning calorimetry experiments of the initial T651 condition. The kinetics of the quench-induced precipitation were investigated by in situ cooling differential scanning calorimetry for a wide range of cooling rates. The nature of those quench-induced precipitates was analyzed by electron microscopy. The experimental data was evaluated with respect to the detrimental effect of incomplete dissolution on the age-hardening potential. We show that if the chosen solution temperature and soaking duration are too low or short, the solution treatment results in an incomplete dissolution of secondary phase particles. This involves precipitation during subsequent cooling to start concurrently with the onset of cooling, which increases the quench sensitivity. However, if the solution conditions allow the formation of a complete solid solution, precipitation will start after a certain degree of undercooling, thus keeping the upper critical cooling rate at the usual alloy-specific level.
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