Study of microstructure, hydrogen solubility and corrosion of Ta-modified Zr-1Nb alloys for nuclear applications

P.A. Ferreirós, E.C. Savoy Polack, L.A. Lanzani, P.R. Alonso, D.P. Quirós, J.I. Mieza, E. Zelaya, Sandy Knowles, G.H. Rubiolo

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Modified Zr-1Nb alloys with Ta additions is a potential strategy to improve structural alloys for nuclear reactors. The effects of Ta on microstructural stability and resistance to corrosion of Zr–1Nb alloys were systematically investigated and elucidated. The (α+β) microstructure in Zr-1.05Nb, Zr-0.85Nb-0.20Ta and Zr-0.85Nb-0.40Ta (wt.%) alloys were obtained with the following two thermo mechanical processes after a water quenching from βZr: a) annealed at 570 °C for 3840 h and b) a combination of intermediate annealing temperatures and cold rolled steps. Quantitative EDS-TEM analysis together with DSC measurements were used to characterise the changes in phase compositions and the fraction of beta-phase precipitates. Hydrogen solubility was measured in alloys with the first annealed condition. The Ta additions increase the monotectic transformation temperature, improves the steam corrosion at 400 °C and 10 MPa up to 14 days, and decreases slightly the hydrogen solubility. The higher thermal microstructural stability compared to Ta-free Zr-1Nb alloys provide potential advantages for increases in operating temperature or acceleration of precipitation kinetics during thermomechanical processing.
Original languageEnglish
Title of host publicationTMS 2022 Conference Proceedings
Publication statusAccepted/In press - 29 Sep 2021
EventTMS 2022 Annual Meeting & Exhibition - Anaheim Convention Center & Anaheim Marriott , Anaheim, United States
Duration: 27 Feb 20223 Mar 2022

Conference

ConferenceTMS 2022 Annual Meeting & Exhibition
Country/TerritoryUnited States
CityAnaheim
Period27/02/223/03/22

Keywords

  • Zr-Nb alloys
  • Ta addition
  • phase transformation
  • corrosion
  • hydrogen solubility

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