Mechanical properties of Ir-Nb-Pt-Al Quaternary Alloys

摘要

Ir-Nb-Ni-Al quaternary alloys showed greatly improved ductility with higher compressive strain than Ir-base binary and ternary alloys. However, the microstructure was not satisfactory, most of the samples presented three or four phases with two kinds of L1_2. Moreover, the creep tests presented that Ir-Nb-Ni-Al alloys had higher creep rate than binary and ternary alloys because of the larger lattice misfits between fcc and L1_2. In this case, another quaternary system Ir-Nb-Pt-Al was considered. The investigation on phase relationship showed promising results. Only fcc/L1_2 two-phase structure was found in all the alloys investigated. Fine fcc/L1_2 two-phase structure was observed at the certain temperature. The lattice misfit between fcc and L1_2 phase was which implied a nice creep property. The present work was concentrated on the investigation of mechanical properties of Ir-Nb-Pt-Al alloys.