Abstract
Gas atomized Ti15Mo alloy powder was processed by cryogenic milling. Both initial gas atomized and milled powders were consolidated by spark plasma sintering at temperatures ranging from 750 °C to 850 °C for 1 and 3 min. Microstructure of the sintered samples was studied by scanning electron microscopy (SEM), chemical contamination was determined by carrier gas hot extraction (CGHE) method and phase composition was investigated by X-ray diffraction.Cryogenic milling resulted in severe plastic deformation of initially spherical particles, changing their shape, but without a significant decrease of particle size. The milled powder achieved the full density after sintering at 750 °C, while 850 °C was required for a full densification of the initial powder. The amount of α phase was higher in the sintered milled powder, while the sintered non-milled powder contained significant amount of ω phase. It was shown that an ultrafine-grained two-phase microstructure can be produced by a combination of cryogenic milling and spark plasma sintering.
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