  High energy milling of MgB2 pre-reacted powder renders the material largely
amorphous through extreme mechanical deformation and is suitable for
mechanically alloying MgB2 with dopants including carbon. Bulk samples of
milled C and MgB2 powders subjected to hot isostatic pressing and Mg vapor
annealing have achieved critical fields in excess of 32T and critical current
density approaching 10^6 A/cm^2.
