Hi

try a solution of 25ml HNo3 and 75ml H2o for 60 s.

it might help you.

good luck!

In those alloys, it is very difficult to reveal grain boundaries by metallographic etching. Do you have access to a SEM with EBSD? It might be an efficient tool to the observation of grains and grain bouundaries.

Thanks for your suggestions. I will try this etchant and EBSD.

Thanks again

try a solution of Keller’s reagent (150 mL H2O, 3 mL HNO3 and 6 mL HF). The etching solution cooled to 0 °C and specimens were etched for about 20 s in order to study the grain structure,

What should I do if I want to see precipitates present in the grain boundary ?