Plastic Flow and Fracture of B2 NiAl-based Intermetallic Alloys Containing a Ductile Second Phase.

The use of NiAl as a structura] material has been hindered by its lack of tensiie ductility or toughness at room temperature. The operative flow and fracture mechanisms in monolithic NiAI Ieading to these poor low temperature properties are analyzed. demonstrating the need for ductile phase toughening. Progress in ductile phase reinforced intermetal]ics and NiAl-based materials are reviewed and the primary mechanisms involved in the flow and fracture of ductile phase reinforced alloys are clarified by recent investigations of directionally solidified