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Properties of compacts made from aluminium powder, milled under different atmospheres,were evaluated. The duration of all the milling processes was 10 h, although different atmosphereswere tested: vacuum, confined ammonia, and vacuum combined with a short-time ammonia gas flow(5 min). Milled powders were consolidated by cold uniaxial pressing and vacuum sintering.The natureand content of the second phases change with the milling atmosphere, allowing the modificationof the mechanical properties of the compacts.  Results showed that hardness and tensile strengthwere highly dependent on the milling atmosphere. Milling carried out in vacuum with a short-timeammonia gas flow notably improved compacts’ properties, as compared with 10 h vacuum milling.Hardness increased from 96 to 150 HB, and ultimate tensile strength rose from 247 to 476 MPaFinancial support of the Ministerio de Economia y Competitividad (Spain) through the research projects DPI2015-69550-C2-1-P and DPI2015-69550-C2-2-P is gratefully acknowledged. We also thank the Microscopy Service of CITIUS (University of Seville)

Influence of Milling Atmosphere on the Controlled Formation of Ultrafine Dispersoids in Al-Based MMCs