Observations of defect structure evolution in proton and Ni ion irradiated Ni-Cr binary alloys

Samuel A. Briggs; Christopher M. Barr; Janne Pakarinen; Mahmood Mamivand; Khalid Hattar; Dane D. Morgan; Mitra Taheri; Kumar Sridharan

doi:10.1016/j.jnucmat.2016.06.046

Observations of defect structure evolution in proton and Ni ion irradiated Ni-Cr binary alloys

Samuel A. Briggs^*
, Christopher M. Barr
, Janne Pakarinen
, Mahmood Mamivand
, Khalid Hattar
, Dane D. Morgan
, Mitra Taheri
, Kumar Sridharan

^*Corresponding author for this work

Not published at VTT

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

20 Citations (Scopus)

Abstract

Two binary Ni-Cr model alloys with 5 wt% Cr and 18 wt% Cr were irradiated using 2 MeV protons at 400 and 500 °C and 20 MeV Ni⁴⁺ ions at 500 °C to investigate microstructural evolution as a function of composition, irradiation temperature, and irradiating ion species. Transmission electron microscopy (TEM) was applied to study irradiation-induced void and faulted Frank loops microstructures. Irradiations at 500 °C were shown to generate decreased densities of larger defects, likely due to increased barriers to defect nucleation as compared to 400 °C irradiations. Heavy ion irradiation resulted in a larger density of smaller voids when compared to proton irradiations, indicating in-cascade clustering of point defects. Cluster dynamics simulations were in good agreement with the experimental findings, suggesting that increases in Cr content lead to an increase in interstitial binding energy, leading to higher densities of smaller dislocation loops in the Ni-18Cr alloy as compared to the Ni-5Cr alloy.

Original language	English
Pages (from-to)	48-58
Number of pages	11
Journal	Journal of Nuclear Materials
Volume	479
DOIs	https://doi.org/10.1016/j.jnucmat.2016.06.046
Publication status	Published - 1 Oct 2016
MoE publication type	A1 Journal article-refereed

Funding

Research was sponsored by the US National Science Foundation , Grant No. 1105640 . Proton irradiation of Ni-Cr alloys was performed at the UW Ion Beam Laboratory. Ni ion irradiation of Ni-Cr alloys was fully supported by the Division of Materials Science and Engineering, Office of Basic Energy Sciences, U.S. Department of Energy. Sandia National Laboratories is a multi-program laboratory managed and operated by Sandia Corporation, a wholly owned subsidiary of Lockheed Martin Corporation, for the U.S. Department of Energy’s National Nuclear Security Administration under contract DE-AC04-94AL85000. Focused ion beam sample preparation was performed at the MaCS Laboratory at the Center for Advanced Energy Studies at Idaho National Laboratory. Scanning and transmission electron microscopy was performed at the University of Wisconsin-Madison Materials Science Center. Funding for SAB was provided by the DOE Office of Nuclear Energy’s Nuclear Energy University Programs .

Keywords

Frank loops
Nickel alloys
Radiation damage
Scanning/transmission electron microscopy
Voids

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10.1016/j.jnucmat.2016.06.046

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title = "Observations of defect structure evolution in proton and Ni ion irradiated Ni-Cr binary alloys",

abstract = "Two binary Ni-Cr model alloys with 5 wt\% Cr and 18 wt\% Cr were irradiated using 2 MeV protons at 400 and 500 °C and 20 MeV Ni4+ ions at 500 °C to investigate microstructural evolution as a function of composition, irradiation temperature, and irradiating ion species. Transmission electron microscopy (TEM) was applied to study irradiation-induced void and faulted Frank loops microstructures. Irradiations at 500 °C were shown to generate decreased densities of larger defects, likely due to increased barriers to defect nucleation as compared to 400 °C irradiations. Heavy ion irradiation resulted in a larger density of smaller voids when compared to proton irradiations, indicating in-cascade clustering of point defects. Cluster dynamics simulations were in good agreement with the experimental findings, suggesting that increases in Cr content lead to an increase in interstitial binding energy, leading to higher densities of smaller dislocation loops in the Ni-18Cr alloy as compared to the Ni-5Cr alloy.",

keywords = "Frank loops, Nickel alloys, Radiation damage, Scanning/transmission electron microscopy, Voids",

author = "Briggs, \{Samuel A.\} and Barr, \{Christopher M.\} and Janne Pakarinen and Mahmood Mamivand and Khalid Hattar and Morgan, \{Dane D.\} and Mitra Taheri and Kumar Sridharan",

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doi = "10.1016/j.jnucmat.2016.06.046",

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T1 - Observations of defect structure evolution in proton and Ni ion irradiated Ni-Cr binary alloys

AU - Briggs, Samuel A.

AU - Barr, Christopher M.

AU - Pakarinen, Janne

AU - Mamivand, Mahmood

AU - Hattar, Khalid

AU - Morgan, Dane D.

AU - Taheri, Mitra

AU - Sridharan, Kumar

PY - 2016/10/1

Y1 - 2016/10/1

N2 - Two binary Ni-Cr model alloys with 5 wt% Cr and 18 wt% Cr were irradiated using 2 MeV protons at 400 and 500 °C and 20 MeV Ni4+ ions at 500 °C to investigate microstructural evolution as a function of composition, irradiation temperature, and irradiating ion species. Transmission electron microscopy (TEM) was applied to study irradiation-induced void and faulted Frank loops microstructures. Irradiations at 500 °C were shown to generate decreased densities of larger defects, likely due to increased barriers to defect nucleation as compared to 400 °C irradiations. Heavy ion irradiation resulted in a larger density of smaller voids when compared to proton irradiations, indicating in-cascade clustering of point defects. Cluster dynamics simulations were in good agreement with the experimental findings, suggesting that increases in Cr content lead to an increase in interstitial binding energy, leading to higher densities of smaller dislocation loops in the Ni-18Cr alloy as compared to the Ni-5Cr alloy.

AB - Two binary Ni-Cr model alloys with 5 wt% Cr and 18 wt% Cr were irradiated using 2 MeV protons at 400 and 500 °C and 20 MeV Ni4+ ions at 500 °C to investigate microstructural evolution as a function of composition, irradiation temperature, and irradiating ion species. Transmission electron microscopy (TEM) was applied to study irradiation-induced void and faulted Frank loops microstructures. Irradiations at 500 °C were shown to generate decreased densities of larger defects, likely due to increased barriers to defect nucleation as compared to 400 °C irradiations. Heavy ion irradiation resulted in a larger density of smaller voids when compared to proton irradiations, indicating in-cascade clustering of point defects. Cluster dynamics simulations were in good agreement with the experimental findings, suggesting that increases in Cr content lead to an increase in interstitial binding energy, leading to higher densities of smaller dislocation loops in the Ni-18Cr alloy as compared to the Ni-5Cr alloy.

KW - Frank loops

KW - Nickel alloys

KW - Radiation damage

KW - Scanning/transmission electron microscopy

KW - Voids

UR - https://www.scopus.com/pages/publications/84978064532

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DO - 10.1016/j.jnucmat.2016.06.046

M3 - Article

AN - SCOPUS:84978064532

SN - 0022-3115

VL - 479

SP - 48

EP - 58

JO - Journal of Nuclear Materials

JF - Journal of Nuclear Materials

ER -

Observations of defect structure evolution in proton and Ni ion irradiated Ni-Cr binary alloys

Abstract

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Keywords

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