MICROSTRUCTURE AND MECHANICAL-PROPERTIES OF A TIAL-BASED POWDER ALLOYCONTAINING CARBON

Gas-atomised powder of a Ti-48Al-2Mn-2Nb (at.%) matrix alloy containin g 0.8 at.% carbon addition has been examined in the as-solidified and as-HIPped conditions. The as-atomised material consisted of fine powde r particles supersaturated in carbon and coarser powder particles cont aining large carbide platelets. HIPping over the temperature range 125 0-1400 degrees C produced fully consolidated structures containing var ious carbide particles. Mechanical testing of HIPped samples revealed that carbon has a beneficial effect on the strength and creep behaviou r, but reduces tensile ductility. The forgeability of the consolidated powder was also examined. (C) 1998 Elsevier Science S.A.