SIMS and thermal evolution analysis of oxygen in Zr‐1%Nb alloy after high‐temperature transitions

Abstract

The concentration of oxygen in the primary β-phase of Zr-1%Nb alloy was investigated using SIMS and thermal evolution analysis (TEA). The specimens were as-received or preoxidized in water vapor (425 • C/10,7 MPa) to simulate the reactor conditions. Then the specimens were exposed to hot water vapor (0,1 MPa) and high temperatures (950-1200• C) for variable time intervals, which simulated the Loss of Coolant Accident (LOCA). The specimens were quenched in water with ice. Both SIMS and TEA quantitative results were in good agreement and were correlated with the mechanical properties (microhardness, residual ductility), which depend on the oxygen concentration and are important for the safety analyses assessment. The ceiling concentration of oxygen in the β-phase was established based on the experimental results of SIMS and TEA.

Focused ion beam–SIMS oxygen assay of the surface of titanium alloys prepared by the shot peening process

“…With limitations in the microhardness technique evident, an alternative analytical method is sought to determine oxygen diffusion profiles in titanium alloys after annealing in air. Recently, the applicability of the SIMS technique for quantitative assessment of bulk oxygen content in a Zr–1%Nb alloy has been investigated . Ti and Zr‐based alloys both posses a high solubility for oxygen, and the aim of this study was to examine the potential of focused ion beam (FIB)–SIMS for characterizing the inward dissolution of oxygen in surface treated titanium alloys after thermal exposure in air.…”