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 thermomechanical 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 provides potential advantages for increases in operating temperature or acceleration of precipitation kinetics during thermomechanical processing.
|Title of host publication||TMS 2022 151st Annual Meeting and Exhibition Supplemental Proceedings|
|Editors||The Minerals, Metals & Materials Society|
|Number of pages||11|
|ISBN (Print)||9783030923815, 9783030923808, 9783030923839|
|Publication status||Published - 7 Feb 2022|
|Event||TMS 2022 Annual Meeting & Exhibition - Anaheim Convention Center & Anaheim Marriott , Anaheim, United States|
Duration: 27 Feb 2022 → 3 Mar 2022
|Name||Minerals, Metals and Materials Series|
|Conference||TMS 2022 Annual Meeting & Exhibition|
|Period||27/02/22 → 3/03/22|
Bibliographical noteFunding Information:
This study was supported by FonCyT, through PICT-2015-2267 and PICT-2018-01671 projects and by UNSAM, through PAI 2020-80020190200024SM project. P.A. Ferreirós & A.J. Knowles acknowledge funding from the UK Engineering and Physical Sciences Research Council (EPSRC) Grant EP/T01220X/1. The authors would also like to thank Jóhan Pauli Magnussen for his help with the phase equilibrium modelling.
© 2022, The Minerals, Metals & Materials Society.
- Hydrogen solubility
- Phase transformation
- Ta addition
- Zr–Nb alloys
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Energy Engineering and Power Technology
- Mechanics of Materials
- Metals and Alloys
- Materials Chemistry