What role does nickel play when matched with tantalum, niobium and zirconium?

Pure nickel itself has balanced oxidation and alkali corrosion resistance at moderate temperatures, and it serves as the main matrix element to create composite alloys with tantalum, niobium and zirconium. Adding trace tantalum or niobium to nickel-based alloys improves creep resistance and high-temperature structural stability. Zirconium added into nickel systems refines grain boundaries and strengthens thermal fatigue performance. Nickel can also act as transition bonding layers when welding tantalum, niobium or zirconium parts, solving the welding compatibility problem between refractory metals and other structural components in industrial equipment.