Effects of 10 MeV electron irradiation at high temperature of a Ni-Mo-based Hastelloy

N. Wanderka; A. Bakai; C. Abromeit; D. Isheim; D. N. Seidman

doi:10.1016/j.ultramic.2007.02.029

Effects of 10 MeV electron irradiation at high temperature of a Ni-Mo-based Hastelloy

N. Wanderka^*, A. Bakai, C. Abromeit, D. Isheim, D. N. Seidman

^*Corresponding author for this work

Materials Science and Engineering

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

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Abstract

A Hastelloy alloy was irradiated with 10 MeV electrons at 650 °C for 700 h to a total dose of 2×10^-3 displacements per atom (dpa). The microstructure of irradiated and non-irradiated specimens of this alloy were investigated by transmission electron microscopy (TEM). The non-irradiated specimens were analyzed by 3-D atom probe tomography (APT) in a local-electrode atom-probe (LEAP™). TEM analysis before the irradiation detects small precipitates with a mean diameter of 22 nm, which are coherent with the FCC matrix. The number density of these precipitates is ∼7×10¹⁸ m^-3. Electron diffraction patterns from these precipitates exhibit superlattice reflections corresponding to the L1₂ ordered structure. The chemical composition of the precipitates, as measured by APT, is around 75 at% Ni with additions of Al, Ti and Mo. After electron irradiation, small precipitates with an irregular morphology are observed. The number density of these new precipitates about 10²⁰ m^-3 is greater than that of the L1₂ ordered precipitates before irradiation. The L1₂ superlattice reflections disappear completely, instead diffuse diffraction spots are observed at 〈 1 frac(1, 2) 0 〉_FCC, which is attributed to compositional short-range order (SRO). The results are discussed with respect to the influence of the electron irradiation on the morphology and structure of the ordered precipitates.

Original language	English (US)
Pages (from-to)	786-790
Number of pages	5
Journal	Ultramicroscopy
Volume	107
Issue number	9
DOIs	https://doi.org/10.1016/j.ultramic.2007.02.029
State	Published - Sep 2007

Keywords

APT
Electron irradiation
Hastelloy alloy
Microstructure
TEM

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Atomic and Molecular Physics, and Optics
Instrumentation

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10.1016/j.ultramic.2007.02.029

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@article{50c3ddd45c0b4196a711b0a9954a7760,

title = "Effects of 10 MeV electron irradiation at high temperature of a Ni-Mo-based Hastelloy",

abstract = "A Hastelloy alloy was irradiated with 10 MeV electrons at 650 °C for 700 h to a total dose of 2×10-3 displacements per atom (dpa). The microstructure of irradiated and non-irradiated specimens of this alloy were investigated by transmission electron microscopy (TEM). The non-irradiated specimens were analyzed by 3-D atom probe tomography (APT) in a local-electrode atom-probe (LEAP{\texttrademark}). TEM analysis before the irradiation detects small precipitates with a mean diameter of 22 nm, which are coherent with the FCC matrix. The number density of these precipitates is ∼7×1018 m-3. Electron diffraction patterns from these precipitates exhibit superlattice reflections corresponding to the L12 ordered structure. The chemical composition of the precipitates, as measured by APT, is around 75 at% Ni with additions of Al, Ti and Mo. After electron irradiation, small precipitates with an irregular morphology are observed. The number density of these new precipitates about 1020 m-3 is greater than that of the L12 ordered precipitates before irradiation. The L12 superlattice reflections disappear completely, instead diffuse diffraction spots are observed at 〈 1 frac(1, 2) 0 〉FCC, which is attributed to compositional short-range order (SRO). The results are discussed with respect to the influence of the electron irradiation on the morphology and structure of the ordered precipitates.",

keywords = "APT, Electron irradiation, Hastelloy alloy, Microstructure, TEM",

author = "N. Wanderka and A. Bakai and C. Abromeit and D. Isheim and Seidman, {D. N.}",

note = "Funding Information: Financial support from the DFG (Grant number GZ: 436 UKR 17/4/05) is acknowledged (A. Bakai). Atom-probe tomographic analyses were performed at the Northwestern University Center for Atom-Probe Tomography (NUCAPT). The LEAP tomograph was purchased with funding from the NSF-MRI (Grant number DMR-0420532) and ONR-DURIP (Grant number N00014-0400798) programs. The help of Dr. V. Kindrachuk with the LEAP analyses is acknowledged. Copyright: Copyright 2008 Elsevier B.V., All rights reserved.",

year = "2007",

month = sep,

doi = "10.1016/j.ultramic.2007.02.029",

language = "English (US)",

volume = "107",

pages = "786--790",

journal = "Ultramicroscopy",

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T1 - Effects of 10 MeV electron irradiation at high temperature of a Ni-Mo-based Hastelloy

AU - Wanderka, N.

AU - Bakai, A.

AU - Abromeit, C.

AU - Isheim, D.

AU - Seidman, D. N.

N1 - Funding Information: Financial support from the DFG (Grant number GZ: 436 UKR 17/4/05) is acknowledged (A. Bakai). Atom-probe tomographic analyses were performed at the Northwestern University Center for Atom-Probe Tomography (NUCAPT). The LEAP tomograph was purchased with funding from the NSF-MRI (Grant number DMR-0420532) and ONR-DURIP (Grant number N00014-0400798) programs. The help of Dr. V. Kindrachuk with the LEAP analyses is acknowledged. Copyright: Copyright 2008 Elsevier B.V., All rights reserved.

PY - 2007/9

Y1 - 2007/9

N2 - A Hastelloy alloy was irradiated with 10 MeV electrons at 650 °C for 700 h to a total dose of 2×10-3 displacements per atom (dpa). The microstructure of irradiated and non-irradiated specimens of this alloy were investigated by transmission electron microscopy (TEM). The non-irradiated specimens were analyzed by 3-D atom probe tomography (APT) in a local-electrode atom-probe (LEAP™). TEM analysis before the irradiation detects small precipitates with a mean diameter of 22 nm, which are coherent with the FCC matrix. The number density of these precipitates is ∼7×1018 m-3. Electron diffraction patterns from these precipitates exhibit superlattice reflections corresponding to the L12 ordered structure. The chemical composition of the precipitates, as measured by APT, is around 75 at% Ni with additions of Al, Ti and Mo. After electron irradiation, small precipitates with an irregular morphology are observed. The number density of these new precipitates about 1020 m-3 is greater than that of the L12 ordered precipitates before irradiation. The L12 superlattice reflections disappear completely, instead diffuse diffraction spots are observed at 〈 1 frac(1, 2) 0 〉FCC, which is attributed to compositional short-range order (SRO). The results are discussed with respect to the influence of the electron irradiation on the morphology and structure of the ordered precipitates.

AB - A Hastelloy alloy was irradiated with 10 MeV electrons at 650 °C for 700 h to a total dose of 2×10-3 displacements per atom (dpa). The microstructure of irradiated and non-irradiated specimens of this alloy were investigated by transmission electron microscopy (TEM). The non-irradiated specimens were analyzed by 3-D atom probe tomography (APT) in a local-electrode atom-probe (LEAP™). TEM analysis before the irradiation detects small precipitates with a mean diameter of 22 nm, which are coherent with the FCC matrix. The number density of these precipitates is ∼7×1018 m-3. Electron diffraction patterns from these precipitates exhibit superlattice reflections corresponding to the L12 ordered structure. The chemical composition of the precipitates, as measured by APT, is around 75 at% Ni with additions of Al, Ti and Mo. After electron irradiation, small precipitates with an irregular morphology are observed. The number density of these new precipitates about 1020 m-3 is greater than that of the L12 ordered precipitates before irradiation. The L12 superlattice reflections disappear completely, instead diffuse diffraction spots are observed at 〈 1 frac(1, 2) 0 〉FCC, which is attributed to compositional short-range order (SRO). The results are discussed with respect to the influence of the electron irradiation on the morphology and structure of the ordered precipitates.

KW - APT

KW - Electron irradiation

KW - Hastelloy alloy

KW - Microstructure

KW - TEM

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U2 - 10.1016/j.ultramic.2007.02.029

DO - 10.1016/j.ultramic.2007.02.029

M3 - Article

C2 - 17403580

AN - SCOPUS:34249105524

VL - 107

SP - 786

EP - 790

JO - Ultramicroscopy

JF - Ultramicroscopy

SN - 0304-3991

IS - 9

ER -

Effects of 10 MeV electron irradiation at high temperature of a Ni-Mo-based Hastelloy

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Keywords

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