Usually I measure grain size of my dense ceramic samples from SEM microstructures using ImageJ by line-intercept method. But now I have a range of samples with 90 to 94% density. The SEM images have porosity levels different to one another in case of comparing all samples. How to measure grain size in this case from ImageJ as i don't think the method described is good now due to a lot of porosity? Should i measure grain size individually of many grains?
Muhammad Waqas Khalid Refer the link https://www.researchgate.net/post/How_to_calculate_the_grain_size_through_SEM_images
dear Muhammad Waqas Khalid
One of the simplest techniques to estimate an average grain size is the intercept technique. A random straight line is drawn though the micrograph. The number of grain boundaries intersecting the line are counted. The average grain size is found by dividing the number of intersections by the actual line length.
Average grain size =1/(number of intersections/actual length of the line).
where actual line length = measured length divided by magnification
and also there is an easy way is to use a free software called SPIP. Just download the instruction manual and see the grain detection.... But the best way I suggest is to use Matlab... you can program Matlab according to the kind of image u 've ... there are several ways to program, but for that u shd provide the details of your image (I am not an expert, but I am suggesting this with my limited knowledge n experience... also, I guess u already 've the SEM image)
PS: You have a distribution of grains on the surface right?
yours
Dear Waqas
You can calculate the grain size using this method, simply by taking the average of individual grains which are clearly visible in your SEM spectra.
Or you can also perform TEM.
Regards
Estimated Muhammad Waqas Khalid ,
You can use this method to measure the grain size/ grain size distribution of your ceramics. Just remove the pores that eventually were counted as grains from your statistics. I do not see any problems to measure grains when porosity level is varying in between a close range (90-94%).
The porosity level is going to influence the extrinsic properties of your ceramics, e.g. mechanical properties, electrical properties and so on. You can combine all these information (porosity level, grain size, grain size distribution with your extrinsic properties).
Best regards.
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