I have some alloys. 4 samples with small variation in chemical composition. I annealed them. I have XRD, SEM and EDS before and after annealing. I want to identify the regime of annealing. Whether the annealed samples are in recapitalization, recovery or grain growth?
With SEM you can determine the average grain size of the alloy and say whether the grain is growing or not (with the onset of the recrystallization process, the average grain size should increase). In order for the grain boundaries to be visible more clearly, you need to gently etch the polished section. Grain in etched microsections is visible even in optical microscopy.
With the help of EDS and SEM, you can see how the distribution of elements within the grain and on its boundaries varies, as well as possible changes in the state of various structural defects (pores and microcracks). The temperature of the onset of these changes is the temperature of the recover.
XRD can help if certain crystalline phases are to be detected in your alloy. It is particularly important who these phases are less than 1-2 microns. Without XRD you only get elemental compositions of coarse phases (EDS can only reasonably analyze the phases larger than 2-4 microns).
Dear Amol Kamble,
I agree with Dr. Vadim Verlotski. You can identify the regime by observing the etched microstructure of alloys under optical microsccopy or SEM depending on the size of grains. Analyse the grain size before and after annealing. If you have cold-worked, the grains might have refined. So, after Annealing,
Anas
OK Thanks to all of you
Hello Anas,
This is quite useful information. Can you elaborate more on equi axed grains?
My samples are polished, how to measure grain size?
Dear Amol,
Attached below is an example (obtained from internet) of material after recrystallisation. This represents equi-axed grain structure, which means that for a particular grain, the size from the centre is almost equal in all axes (app. 1-1.2 times size is acceptable). Altogether in the microstructure, we could observe grains of similar shape and the size distribution is narrow.
Your polished samples have to be etched. Grain size can be measured by line-intercept method or by using image analysis softwares
Anas
ok i got the idea. thanks for help me to sort out issue. from this i can say my sample is in recrystallization regime. just for confirmation i m attaching the image. please confirm it
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