I should analyze the structure changes (grain dimension and shape) of a highly deformed aluminum sheet AA6082-T6 worked up to 300°C as done by clinching process under warm conditions.
You may etch your specimen of aluminium EN AW 6082 alloy with: Methanol (25 cm3) + HCl conc. (25 cm3) + HNO3 conc. (25 cm3) + HF conc. (1 drop), from 10 s to 1 min:
http://www.metallographic.com/Etchants/Aluminum%20etchants.htm
Thanks Carlos, I have already tried such an etchant for different times but with poor results. The grain boundaries were not so clear. Probably electro-chemical etching could provide better results? Please see Fig. 22 of "Clinch joining of heat-treatable aluminum AA6082-T6 alloy under warm conditions"
http://www.sciencedirect.com/science/article/pii/S0924013615300339
I've found some microstructural analysis involving anodising which provide wonderful results. "The process involved immersion of selected samples either in an electrolyte containing 2% HF, 2% HBF4, 48 % ethanol and 48 % H2O by volume, or an electrolyte containing 5% HBF4 and 95 % H2O by volume. Both electrolytes produced similar results. The potential and current was set to 20 V and 1 A respectively. Moreover, the required immersion time
was found to vary for the individual samples, however a holding time of approximately 90
seconds was found to provide satisfactory results for most variants." attached are some cross sections reported in a PhD thesis on FSW. Does anybody have experience on such type of microstructural analysis?
CAN YOU PLEASE TELL THE EXACT COMPOSITION OF MODIFIED POUTONS REAGENT USED FOR ETCHING OF ALUMINIUM 6082 ALLOY
Vipin Sharma
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