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Aluminium powder was mechanically alloyed under ammonia gas flow for differenttimes (1-5 h) in order to produce a second-phase reinforcement, mainly by aluminium nitride(AlN). After milling, powders were consolidated by cold uniaxial pressing and vacuumsintering. A small amount of copper powder was added to the Al milled powder to improve itssintering behavior. Hardness and indirect tensile test were carried out at room and hightemperature to evaluate the mechanical properties evolution. Results showed an remarkablehardness increase with the second phases content, even at high temperature (up to 229 HB at 400ºC). However, the high content of second phases of ceramic nature decreases the ductility,resulting in low values of tensile strength (lower than 160 MPa)

High temperature behavior of nanostructured Al powders obtained by mechanical alloying under NH3 flow