期刊
MATERIALS LETTERS
卷 206, 期 -, 页码 26-29出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.matlet.2017.06.107
关键词
Zirconium alloy; High-pressure torsion; Nanocrystalline materials; Phase transformation; Microstructure; Mechanical properties
资金
- Ministry of Education and Science of Russian Federation
The structure, phase composition, and mechanical properties of commercial zirconium E125 (Zr-2.5% Nb) alloy, which was subjected to high-pressure torsion (HPT) and subsequent annealings, were studied. The HPT of alloy samples 20 mm in diameter at 200 degrees C at a pressure of 4 GPa using 5 revolutions (N) leads to the formation of grain-subgrain nano-and submicrocrystalline structure characterized by a high fraction of equiaxed grains 80-100 nm in size. The phase alpha-Zr -> (omega-Zr + beta-Zr) transformation during HPT makes the main contribution to the strength of the alloy. Changes in the mechanical properties of the HPT-alloy during heating are related to both the decomposition of beta-Zr phase and grain growth. (C) 2017 Elsevier B.V. All rights reserved.
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