HIGH-TEMPERATURE INTERACTION BETWEEN ZIRCALOY-4 AND INCONEL-718

The chemical interactions between Zircaloy-4 and Inconel-718 were inve stigated in the temperature range from 1223 to 1523 K. Multiple layers were formed at the interface of the reaction couple. The reaction gen erally obeyed a parabolic rate law and the rate of the reaction was de termined at each examined temperature. It increased with the temperatu re increase. The discontinuity in the temperature dependence of the re action rate was found at two temperatures, at about 1240 K and 1450 K. The elemental analysis with an SEM/EDX indicated that the discontinui ties corresponded to the change of the reaction mechanism. (C) 1997 El sevier Science B.V.