Micropyretic synthesis studies of Ni-, Al-, Ti-, and Nb-containing alloys

摘要

A series of new micropyretically synthesizedcomplex intermetallics and intermetallic composites containingNi,Al,Ti, and Nb have been studied. At the extremities of thisseries were the two alloys with the B2 structure, namely, the NiAland Nb45Al15Ti40 intermetallic compounds, the former beingbrittle and the latter ductile. The alloys in the series were made byadding Ti and Nb to NiAl and processing them by micropyreticmethods. In addition to the matrix B2 phase, the synthesized alloyswere found to contain other phases. Some of the alloys in theseries were noted to possess high fracture toughness and oxidationresistance. A detailed microstructural characterization of thesynthesized alloys was carried out. The mechanism of synthesis inthe alloys has been established by microstructural examination ofthe partially reacted specimens by arresting the combustion processduring the synthesis process.