I am trying to observe the microstructure of AZ91 alloy by polishing it till 1-micron diamond paste cloth polishing and later etching it with 100 ml ethanol, picric acid 5 gms, acetic acid 5 ml, 10ml water for 10-20 sec (till brown films are formed).
But I could not find any grains in the Optical microscope or SEM.
Can anyone with knowledge in this aspect suggest to me what is an appropriate method to attain microstructure? and what are the points to be kept in mind for this process?
Dear Jaya Sandeep Ketha
I hope you get some useful practiced hints shown in the following RG link.
Best regards
https://www.researchgate.net/post/What_is_the_best_tint_etchant_for_AZ91_alloy
Dear researcher;
For metallographic investigations, you can use an acetic glycol solution (20 mL acetic acid, 1 mL HNO3, 60 mL ethylene glycol, and 20 mL water). For more information, you can read the following article:
Article Effect of Rare Earth Elements on High Cycle Fatigue Behavior...
Try repolishing, by a 1 micron diamon you should get a mirror surface, also try using Nital ( 90% metilic alcohol in 10% nitric acid).
you can use a glycol solution (24 mL water, 1 mL HNO3, 75 mL ethylene glycol). general-purpose etch. Immerse for 3-5 seconds, rinse in water, and dry. For more information, you can read the following article: TECH-NOTES volume 4 issue 2 published Buhler.
What synthesis and compaction methods did you use to produce this alloy sample?
Article Effects of Hot Extrusion and Heat Treatment on Mechanical Pr...
You can refer to this article to get desired microstructure. Maybe the microstructure is related to the processing temperature.
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