2A02 aluminum alloy was water quenched at 500℃ and then aged at 170℃ for 16 h. No precipitated phase was found under TEM.I wonder what is the reason for this.
Help me,please
Zhao Kuangyin
When you add water to aluminum oxide, you get aluminum hydroxide. From the sol, you get the gel. A spatial grid of aluminum hydroxide, possibly with hydration water. Correct the aluminum oxide formula.
TEM sample preparation may be repeated. What is size of precipitate in this material? You may be required to optimise the annealing process parameters in terms of time and temperature. If in literature precipitates are seen in SEM (depending on size of precipitate) it will be much easier to interpret.
Zhao Kuangyin, Theta/Theta' and S-phase precipitates are expected to be there.. maybe look into the grain boundaries --better with SEM and also check the alloy composition locally to see if the Cu/Si/Mg are still there. It might be that allowing elements left for interfaces.
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