Abstract
The steady-state creep behavior of a particle-strengthened alloy of niobium (Nb–1Zr–0.1C) was compared with pure niobium and a Nb–1Zr alloy. The approach to a threshold stress was indicated at stress levels below 16 MPa and was supported by a statistical analysis of mean particle size. Analysis of the crept microstructure showed a classic dislocation substructure whose cell size was inversely proportional to the applied stress except at very low stresses. The smaller than predicted cell size observed at low applied stresses was attributed to the particles, preventing the dislocation cells from reaching their equilibrium dimension. Some amount of particle growth was observed which led to a reduction in creep resistance with time.
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