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

Tianyi Chen; Ying Yang; Lizhen Tan

doi:10.1007/s11661-017-4253-0

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

Tianyi Chen, Ying Yang, Lizhen Tan

Microstructural Evolution Modeling

Research output: Contribution to journal › Article › peer-review

9 Scopus citations

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. These alloys show 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 973.15 K (700 °C) for 1275 hours and 1273.15 K (1000 °C) for 336 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 Fe₂Zr_C15 and Fe₂₃Zr₆ coexist with the body-centered cubic matrix phase in all samples regardless of compositions and temperatures.

Original language	English
Pages (from-to)	5009-5016
Number of pages	8
Journal	Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
Volume	48
Issue number	10
DOIs	https://doi.org/10.1007/s11661-017-4253-0
State	Published - Oct 1 2017

Funding

The material is based upon work supported by the U.S. Department of Energy, Office of Nuclear Energy, a Nuclear Energy Enabling Technologies FY2015 Award, under Contract No. DE-AC05-00OR22725. The Nuclear Science User Facility (NSUF) and the Center for Nanophase Materials Sciences (CNMS) are acknowledged for instrument access.

Funders	Funder number
U.S. Department of Energy
Office of Nuclear Energy	DE-AC05-00OR22725

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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. These alloys show 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 973.15 K (700 °C) for 1275 hours and 1273.15 K (1000 °C) for 336 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 Fe2Zr_C15 and Fe23Zr6 coexist with the body-centered cubic matrix phase in all samples regardless of compositions and temperatures.",

author = "Tianyi Chen and Ying Yang and Lizhen Tan",

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N2 - 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. These alloys show 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 973.15 K (700 °C) for 1275 hours and 1273.15 K (1000 °C) for 336 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 Fe2Zr_C15 and Fe23Zr6 coexist with the body-centered cubic matrix phase in all samples regardless of compositions and temperatures.

AB - 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. These alloys show 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 973.15 K (700 °C) for 1275 hours and 1273.15 K (1000 °C) for 336 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 Fe2Zr_C15 and Fe23Zr6 coexist with the body-centered cubic matrix phase in all samples regardless of compositions and temperatures.

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

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