Beamline ID11 is proposed in this project to determine the orientation relationships between nanoparticle(SiC nanowhisker here) and magnesium AZ91 alloy, as well as to visualise nano-SiC interacting with Mg matrix with different dispersion and manufacture processes, benefiting from the unique ID11 in combining of PCT, DCT and scanning-3DXRD for non-destructive multiscale characterisation. The results will be combined with our data from other techniques, enabling us to correlate the microstructural information of the metal composites to their mechanical performance via micromechanical models including grain refinement, load transfer, thermal mismatch and Orowan strengthening. The clear understanding of the correlations is not only important for our research of manufacturing optimisation and composite microstructure characterisation, but also for the whole community of metal nanocomposites to validate the effective reinforcing mechanisms, predict properties and post-process design.