Preparation for the 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.

 

[oswaler]

Hello,

Thank you for your question about preparing a sample for a DSC test to determine phase transformation temperatures. It is important to ensure that the sample is properly prepared in order to obtain accurate results. Here are some tips for preparing your sample for a DSC test:

1. Make sure the sample is properly sized and shaped for the DSC instrument. The sample should be a uniform thickness and have a flat surface to ensure accurate heat transfer during the test.

2. Use appropriate cutting tools and techniques to avoid introducing stresses in the sample. This can be done by using a low-speed saw or laser cutting to minimize heat generation and prevent distortion of the sample.

3. Carefully remove any oxide layers from the sample surface using a non-destructive method such as chemical etching or mechanical polishing.

4. Ensure that the sample is clean and free from any contaminants that may affect the results. This can be done by using solvents or ultrasonic cleaning.

5. It is also important to properly calibrate the DSC instrument before conducting the test to ensure accurate measurements.

I would also recommend consulting any relevant literature or standard methods for preparing samples for DSC testing. Additionally, it may be helpful to consult with other experts in the field for advice on sample preparation for your specific alloy.

I hope this helps and wish you success in your DSC testing. Please let me know if you have any further questions.

Best,