Dear Khaled A. Abdelghafar
In contrast with the opinion of Mr. V R Arun Prakash, DSC is a powerful tool to study the shape memory effect. As you know, the shape memory effect in alloys is mainly developed due to thermoelastic martensitic transformation and its reverse transformation, both of these transformations are detectable by DSC.
First of all, you need to confirm that you have the right alloy (in terms of the chemical and phase compositions).
Also, the shape memory effect must be observable practically in your alloy.
Finally, the conditions of the DSC analysis must be rechecked regarding:
1- The amount of the sample: it must be sufficient to release/absorb a detectable amount of heat.
2- The rate of heating/cooling: it is recommended to avoid the high rates.
3- The range of the temperature: the expected start/finish temperature of the transformation must be within the range of the analysis.
Hi
The shape memory alloys generally do not undergo any phase change. Once they changed their phase they may not able to get reshape. Such a way that the shape memory alloys are designed. But in DSC phase transformation is required by means of energy acquisition or loss to get a notable peak.
Best
Dear Khaled A. Abdelghafar
In contrast with the opinion of Mr. V R Arun Prakash, DSC is a powerful tool to study the shape memory effect. As you know, the shape memory effect in alloys is mainly developed due to thermoelastic martensitic transformation and its reverse transformation, both of these transformations are detectable by DSC.
First of all, you need to confirm that you have the right alloy (in terms of the chemical and phase compositions).
Also, the shape memory effect must be observable practically in your alloy.
Finally, the conditions of the DSC analysis must be rechecked regarding:
1- The amount of the sample: it must be sufficient to release/absorb a detectable amount of heat.
2- The rate of heating/cooling: it is recommended to avoid the high rates.
3- The range of the temperature: the expected start/finish temperature of the transformation must be within the range of the analysis.
Dear Khaled A. Abdelghafar
The ammount of lattice deffects present on your SMA can affect the 'intensity' of the observed peaks in DSC analysis. Therefore, cold working processes can supress the peaks in the expected temperature ranges for the transformation . Also, the peaks can appear in a broad shape on your curves and depending on the quality of your DSC data you cannot define the start and finishing points of the transformation peaks. If your material present some shape recovery after heating, I can suggest a heat treatment to partially recover the material. But keep in mind that it can directly affect your transformation temperatures.
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