Dear Dhana Sekaran you first need to know the standard enthalpy of the formation of aluminides which you can refer to from the following DOI

10.1007/978-94-011-1092-1_12

Then the heat of formation can be calculated by calculating the area under the exothermic peak (in your graph), so these results can be compared to find out the degree of conversion. The below link can be visited to calculate the conversion%.

https://www.mt.com/in/en/home/supportive_content/matchar_apps/MatChar_HB408.html

Dear Dhana Sekaran

when you talk about alpha there are two things you can do depending on the situation.

If you don't know whether all the analysed powders have been converted into aluminides or not, and your concern is knowing how much aluminide has been formed starting from the powders, the first think you need to do is a normalization of the thermogram. Indeed, the heat flow depends on the amount of sample you are analysing. The normalization must be done per mass unit or mol (when possible). Then, only after a correct normalization, you need to know the corresponding standard enthalpy of formation for the considered aluminide. By this way you can compare the area (enthalpy variation) beneath your calorimetric peak to the "reference" one, and the corresponding ratio will give you the degree of conversion, e.g. the amount of converted sample from the starting mass.

Instead, if you are sure that the DSC run provides you a 100% conversion of the powders into aluminides, you can obtain a conversion curve that you could superimpose to your thermogram. By this way, for instance you could say that at 700°C you have alfa= 0.2 (20% of conversion), at 710°C alfa= 0.4 (40% of conversion), etc. The way to obtain the conversion curve is well explained on the Mettler Toledo's link posted by Sweety Rani:

https://www.mt.com/in/en/home/supportive_content/matchar_apps/MatChar_HB408.html

I would like to underline that the two method described above give you different information.

Hope this can help you.

Thanks Rani and Saitta for your clear explanation