High-energy ball milling is widely used for the preparation of materials that are far from equilibrium, e.g. nanostructured, amorphous, and supersaturated alloys and ceramics. Compressibility of nanostructured Fe-Cu materials has been investigated by in-situ high pressure x-ray diffraction using synchrotron radiation. It is found that the bulk modulus of both fcc-Cu and bcc-Fe phases decreases with decreasing grain size. In contrast, small amounts of dopants, i.e. Fe in fcc-Cu and Cu in bcc-Fe, increase the bulk modulus of the metal matrix. The unstable ferromagnetic fcc-FeCu solid solution prepared by mechanical alloying has a bulk modulus of about 85 GPa which is much smaller than the corresponding values for bulk fcc-Cu and bcc-Fe.
|Effective start/end date||01/01/1998 → 31/12/2002|