High-temperature deformation of L12-FCC
two-phase Ir-15Nb-Ni refractory superalloys
two-phase Ir-15Nb-Ni refractory superalloys
(National Institute for Materials Science, 1-2-1 Sengen, Tsukuba,
Ibaraki 305-0041, Japan)
Ibaraki 305-0041, Japan)
Abstract: The creep behaviors of the Ni-added Ir85Nb15 alloys were investigated at 1650～1800℃ by compression tests in vacuum. X-ray diffractometry, transmission electron microscopy and scanning electron microscopy we re conducted to characterize the microstructure and lattice misfit change by the addition of Ni in the Ir85Nb15 alloy. The results reveal that the Ni addition has a significant effect on the creep resistance of the Ir85Nb15 two-phase refractory superalloys. Basing on the results, the relationship among the Ni addition, lattice misfit, microstructure development, and the creep behavior in the Ni-added Ir85Nb15 alloys is discussed.
Key words: refractory superalloy; microstructure; lattice misfit; creep behavior