Refer this link:https://books.google.co.in/books?id=wMJ9CAAAQBAJ&pg=PT184&lpg=PT184&dq=metal+material+homogeneous&source=bl&ots=wjTltHdY7Y&sig=f2yoUTbmDb85mNo7gr9AUlIOjVk&hl=en&sa=X&ved=0CD0Q6AEwBmoVChMI6ILOruG0yAIVRgWOCh31GwDm#v=onepage&q=metal%20material%20homogeneous&f=false

First you should use a Optical Microscope to see the distribution of the particles and if you have similar grain size and if both are homogeneous then If you have access to an scanning electron microscope, you should test the composition of this particles or whatever you have in your material, and again make an analysis about the distribution, shape and size about the differents phases that your material have. It's so recomended to use a large amount of material (maybe a square of 1cm2) to analyse in different sites ando to be sure that you have the same properties around the material.

if it is crystalline form, after xrd measurement, you can do a phase analysis in your sample and if your peaks matched by single phase, then you can say it is homegenous single phase, but if it has more than one , you can not say it, if your sample is a mixture of different phase, which kind of homogenity you want, is it micro size or higher or lower size homegenity you want, so it depends your aim may be you can use edx dot mapping to see the homogeneity