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Phase Transformations under Ball Milling

Under sustained ball milling, metallic alloys may achieve quasi-steady state structures which depend on the milling conditions (temperature, milling intensity) and on the composition of the alloy. This is established for the crystal to amorphous, the order-disorder and the dissolution transformations. While a simple mean field theory well accounts for the observed features of the order-disorder transition, atomic level computer simulations suggest new features which deserve experimental research: the microstructure would reach some dynamical steady state, the characteristic length of which depends on the milling conditions. For the order-disorder transition, it is anticipated that on top of the milling intensity, the details of the time and space structure of the intensity would affect the microstructure, an effect which is reminiscent of the cascade size effect for alloys under irradiation. Moreover, new results on phase separation under milling are presented, which suggest the possibility of a decreased solubility under milling.