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Abstract
An experimental program was performed to determine the rheology and influence of niobium additions to high-purity nickel on dynamic-recrystallization behavior during hot working. Various high-purity alloys were prepared (pure Ni and Ni–0.01, 0.1, 1, 2, 5 and 10wt% Nb) and deformed to high strains by hot torsion to characterize the mechanical behavior within the temperature range from 800 to 1000°C at (von Mises equivalent) strain rates of 0.03, 0.1 and 0.3s−1. A simple analytical method was proposed for predicting the strain-hardening and dynamic-recovery parameters in the classical Yoshie–Laasraoui–Jonas equation. By the means, the effect of niobium solutes on plastic flow was determined, thus enabling a reasonable fit for the flow curves for the entire range of solid solution Ni–Nb alloys.
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