Abnormal grain growth of Zr-1wt.%Nb alloy and the effect of Mo addition
- Inha Univ., Incheon (Korea, Republic of). Dept. of Metallurgical Engineering
- Korea Univ., Seoul (Korea, Republic of). Dept. of Materials Science and Engineering
Increasingly harsh operation conditions of water reactors, such as high burn-up fuel cycles, demand improved Zr-based alloys for the reactor core applications. Enhanced corrosion resistance, better than that of Zircaloy-4, was realized in the newly developed Zr-based alloys containing Nb and Sn. Zr-Nb alloy was developed for pressure tubes of heavy water reactors while Zr-Nb-Si alloys such as ZIRLO and E635 alloys are currently under evaluation as candidate materials for advanced fuel claddings. In the Zr-based alloys containing Nb, generally a fine grain structure is maintained due to the presence of a small amount of retained {beta}. There is a good possibility, therefore, of abnormal grain growth provided that the role of {beta} phase is consistent. Addition of Mo in Zr-Nb alloy, in this respect, is expected to bring about a crucial effect on stabilizing the microstructure. The present work addresses the problem of abnormal grain growth in Zr-Nb system and presents a possible way of curing it by addition of Mo.
- OSTI ID:
- 361739
- Journal Information:
- Scripta Materialia, Journal Name: Scripta Materialia Journal Issue: 10 Vol. 40; ISSN SCMAF7; ISSN 1359-6462
- Country of Publication:
- United States
- Language:
- English
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