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Title: Phase Stability in the Fe-Rich Fe-Cr-Ni-Zr Alloys

Abstract

Knowledge on phase stability in Fe-rich Fe-Cr-Ni-Zr alloys is needed for the development of Laves-phase strengthened Fe-Cr-Ni-Zr ferritic alloys which have shown promising applications as new cladding materials of nuclear reactors due to enhanced high temperature strength, and resistance to creep and irradiation hardening. Phase stability in four Fe-rich Fe-Cr-Ni-Zr alloys was carefully investigated using scanning electron microscopy, transmission electron microscopy, energy-dispersive X-ray spectroscopy and X-ray diffraction techniques. The samples were arc-melted and heat treated at 700 °C for 336 hours and 1000 °C for 1275 hours. The experimental results showed extensive solubility of Ni in the intermetallic phases Fe 23Zr 6 and Fe 2Zr_C15. Nickel stabilizes the Laves Fe 2Zr_C15 structure more than the C36 and C14 structures. In addition to Fe 23Zr 6 and Fe 2Zr_C15, Ni 7Zr 2 was found to be stable in samples with higher Ni content and lower annealing temperature. The body-centered-cubic, Fe 2Zr_C15 and Fe 23Z 6 coexist in all samples regardless of composition and temperature. Detailed analysis suggested that the coexistence of these three phases is not a result of thermodynamic equilibrium, but a result of the competing formation kinetics of Fe 2Zr_C15 and Fe 23Z 6.

Authors:
ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Nuclear Energy (NE)
OSTI Identifier:
1394241
DOE Contract Number:  
AC05-00OR22725
Resource Type:
Journal Article
Journal Name:
Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science
Additional Journal Information:
Journal Volume: 48; Journal Issue: 10; Journal ID: ISSN 1073-5623
Publisher:
ASM International
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Chen, Tianyi, Yang, Ying, and Tan, Lizhen. Phase Stability in the Fe-Rich Fe-Cr-Ni-Zr Alloys. United States: N. p., 2017. Web. doi:10.1007/s11661-017-4253-0.
Chen, Tianyi, Yang, Ying, & Tan, Lizhen. Phase Stability in the Fe-Rich Fe-Cr-Ni-Zr Alloys. United States. doi:10.1007/s11661-017-4253-0.
Chen, Tianyi, Yang, Ying, and Tan, Lizhen. Mon . "Phase Stability in the Fe-Rich Fe-Cr-Ni-Zr Alloys". United States. doi:10.1007/s11661-017-4253-0.
@article{osti_1394241,
title = {Phase Stability in the Fe-Rich Fe-Cr-Ni-Zr Alloys},
author = {Chen, Tianyi and Yang, Ying and Tan, Lizhen},
abstractNote = {Knowledge on phase stability in Fe-rich Fe-Cr-Ni-Zr alloys is needed for the development of Laves-phase strengthened Fe-Cr-Ni-Zr ferritic alloys which have shown promising applications as new cladding materials of nuclear reactors due to enhanced high temperature strength, and resistance to creep and irradiation hardening. Phase stability in four Fe-rich Fe-Cr-Ni-Zr alloys was carefully investigated using scanning electron microscopy, transmission electron microscopy, energy-dispersive X-ray spectroscopy and X-ray diffraction techniques. The samples were arc-melted and heat treated at 700 °C for 336 hours and 1000 °C for 1275 hours. The experimental results showed extensive solubility of Ni in the intermetallic phases Fe23Zr6 and Fe2Zr_C15. Nickel stabilizes the Laves Fe2Zr_C15 structure more than the C36 and C14 structures. In addition to Fe23Zr6 and Fe2Zr_C15, Ni7Zr2 was found to be stable in samples with higher Ni content and lower annealing temperature. The body-centered-cubic, Fe2Zr_C15 and Fe23Z6 coexist in all samples regardless of composition and temperature. Detailed analysis suggested that the coexistence of these three phases is not a result of thermodynamic equilibrium, but a result of the competing formation kinetics of Fe2Zr_C15 and Fe23Z6.},
doi = {10.1007/s11661-017-4253-0},
journal = {Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science},
issn = {1073-5623},
number = 10,
volume = 48,
place = {United States},
year = {2017},
month = {7}
}

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