Creep Behavior of Ir-Nb-Ni Two-phase Refractory Superalloy

抄録

The compression properties and creep behaviors of the Ni added Ir₈₅Nb₁₅ alloys were investigated by compression tests in air and vacuum. X-ray diffraction, transmission microscopy and scanning electron microscopy were conducted to characterize the microstructure and lattice misfit change by the addition of Ni in Ir₈₅Nb₁₅ alloy. The results reveal that Ni addition can improve the yield strength of Ir₈₅Nb₁₅ alloy at room temperatures. 1 atomic percent Ni addition can raise creep resistance of Ir₈₅Nb₁₅ alloy two orders of magnitude. Basing on the results, the relationship among the Ni addition, the lattice misfit, microstructure development, and the creep behavior in Ni added Ir₈₅Nb₁₅ alloys is discussed in this paper.