DEFORMATION-BEHAVIOR OF THE INTERMETALLIC PHASE AL3NB WITH DO22 STRUCTURE AND OF AL3NB-BASE ALLOYS .1. PHYSICAL-PROPERTIES AND SHORT-TERM BEHAVIOR

In view of efforts to develop new intermetallic high-temperature mater ials, various Al3Nb alloys-i.e. single-phase Al3Nb and Al3(Nb,Ti) with tetragonal DO22 structure as well as Al3Nb-based three-phase alloys w hich contain NiAl with cubic B2 structure and the Laves phase NbNiAl w ith hexagonal C14 structure-have been studied in detail. The work has been centred on the deformation behaviour, which has been studied in c ompression and in bending between room temperature and 1400-degrees-C to determine yield strength, ductility and toughness. Furthermore, the constitution has been analysed and lattice constants, thermal expansi on and elastic moduli have been measured.