Abstract
We have produced a cryomilled nanocomposite powder using a matrix of Al-7.5Mg (wt.%), starting with commercially pure Al and Al-30Mg powders. Additionally, we have augmented the metal matrix composite with 500 μm 84C (2.5 wt.%). X-Ray diffraction and electron microscopy augmented by energy dispersive spectroscopy imaging are used to characterize samples periodically collected during the cryomilling process in order to establish the progression of grain size, solutionizing and dislocation microstrain as well as general morphological considerations. A mechanism of cryomilling action is proposed based on this data which has implications for further work. Discussion of the technical and historical background of cryomilling is presented to provide context for the experimental data. Cryomilling procedure is presented in detail.