I am the one of person who is studying about Ni based superalloy.
Nowadays, I am focusing on the calculation of lattice parameter of gamma and gamma prime in Ni based superalloy by XRD analysis.
Firstly, I want to ask to everyone that which is the method to calculate the exact lattice parameter by XRD.
- Now I am using the peak fit program to deconvolute the overlapped peaks of matrix and gamma prime. But, its result is highly depending on the quality of XRD peaks. Thereby, I have done so many trials and errors.
Could you guys give me some advises or recommends?
The other is why constrained and unconstrained lattice parameter of gamma prime is different?
- I think even though gamma prime phase is extracted by electrolytic method, its lattice parameter will be same I guess.
Could you guys explain whether I was wrong or not?
Thanks for kind answer. I could understand easily.
Here, I want to ask to you more about question 1.
I was analyzing XRD with several slit size from small to large. Sometimes, problems came from quality of each lattice plane.
As I know, we should calculate the lattice parameter of gamma and gamma prime with (111), (200), (220) and (311) which is lattice plane of gamma/gamma prime to minimize the experimental error levels (I mean, use every d spacing of each peaks).
But, if the 2theta peak of (111) plane is so strong and (220) or (311) has weak intensity, tendency has not been established. In this case, how can I calculate the each lattice parameter? just use lattice plane which has strong intensity?
The "tendency" what I mentioned was Nelson-Riley function.
If so, accurate lattice parameter might be come from high quality XRD analysis. Now, I am using the XRD machine with scan speed of 5degree per minute and step size of 0.01 degree. I think it is enough for slow scanning, isn't it? Also, whenever I have operated, parameters were not consistent.
Therefore, I think another machine or method is necessary for me to analyze that.
Could you reference for me which method is better to analyze the lattice parameters?
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