How to Properly Prepare a Sample for a DSC Test?

[mah65]

hi experts

i have a question about how to do a DSC test.

I have a sample (shape memory alloy) to do that test on. I want to determine the phase transformation temperatures. I have done the DSC test several times and gained results that are not favorable. in fact my alloy must not have these transformation temperatures (I'm sure about the composition of my alloy). I think the way I prepare the sample is not correct. for example during cutting the DSC specimen from the original sample, stresses may remain in it and adversely affect the transformation temperatures or maybe during removing the oxide layer mechanically this also happens.
I wonder if there is any standard method to prepare the sample for DSC test to get to good results.

please help.

 

[nbryan5]

Yes, there are standard methods for preparing samples for DSC tests. It is important to note that all samples should be prepared in the same way, so that the results are comparable. First, the sample should be cut into small pieces of a size suitable for the DSC crucible. The surface of the sample should then be prepared to remove any oxides or impurities. This can be done using mechanical polishing or chemical etching. In addition, the sample should be annealed at a temperature close to the transformation temperature before being placed in the DSC crucible. This helps to eliminate any remaining stresses in the sample that could affect the test results. Finally, the sample should be cooled to room temperature before placing it in the DSC crucible. This ensures that the sample is in a consistent state for testing.