I am working on Mg-based metal matrix composites. I added two different types(A&B) with a suitable percentage(1%,2%,3% and 0.5%,1%,1.5%) of ceramics separately using DOE and tested. Now I want to mix both ceramics in the base metal to make hybrid composites. but, I don't know what percentage of both ceramics and on what basis they are to be taken?. Please provide your valuable guidance.