In-Situ Helium Implantation and TEM Investigation of Radiation Tolerance to Helium Bubble Damage in Equiaxed Nanocrystalline Tungsten and Ultrafine Tungsten-TiC Alloy

doi:10.3390/ma13030794

Title: In-Situ Helium Implantation and TEM Investigation of Radiation Tolerance to Helium Bubble Damage in Equiaxed Nanocrystalline Tungsten and Ultrafine Tungsten-TiC Alloy

Abstract

The use of ultrafine and nanocrystalline materials is a proposed pathway to mitigate irradiation damage in nuclear fusion components. Here, we examine the radiation tolerance of helium bubble formation in 85 nm (average grain size) nanocrystalline-equiaxed-grained tungsten and an ultrafine tungsten-TiC alloy under extreme low energy helium implantation at 1223 K via in-situ transmission electron microscope (TEM). Helium bubble damage evolution in terms of number density, size, and total volume contribution to grain matrices has been determined as a function of He+ implantation fluence. The outputs were compared to previously published results on severe plastically deformed (SPD) tungsten implanted under the same conditions. Large helium bubbles were formed on the grain boundaries and helium bubble damage evolution profiles are shown to differ among the different materials with less overall damage in the nanocrystalline tungsten. Compared to previous works, the results in this work indicate that the nanocrystalline tungsten should possess a fuzz formation threshold more than one order of magnitude higher than coarse-grained tungsten.

Authors:

El Atwani, Osman; Unal, Kaan; Cunningham, William Streit; Fensin, Saryu; Hinks, Jonathan; Greaves, Graeme;

Publication Date:: 2020-02-10

Sponsoring Org.:: USDOE

OSTI Identifier:: 1598747

Grant/Contract Number:: 20160674PRD3

Resource Type:: Published Article

Journal Name:: Materials

Additional Journal Information:: Journal Name: Materials Journal Volume: 13 Journal Issue: 3; Journal ID: ISSN 1996-1944

Publisher:: MDPI AG

Country of Publication:: Switzerland

Language:: English

Citation Formats


                    El Atwani, Osman, Unal, Kaan, Cunningham, William Streit, Fensin, Saryu, Hinks, Jonathan, Greaves, Graeme, and Maloy, Stuart. In-Situ Helium Implantation and TEM Investigation of Radiation Tolerance to Helium Bubble Damage in Equiaxed Nanocrystalline Tungsten and Ultrafine Tungsten-TiC Alloy.  Switzerland: N. p., 2020. 
        Web.  doi:10.3390/ma13030794.

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                    El Atwani, Osman, Unal, Kaan, Cunningham, William Streit, Fensin, Saryu, Hinks, Jonathan, Greaves, Graeme, & Maloy, Stuart. In-Situ Helium Implantation and TEM Investigation of Radiation Tolerance to Helium Bubble Damage in Equiaxed Nanocrystalline Tungsten and Ultrafine Tungsten-TiC Alloy.  Switzerland.  doi:10.3390/ma13030794.

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                    El Atwani, Osman, Unal, Kaan, Cunningham, William Streit, Fensin, Saryu, Hinks, Jonathan, Greaves, Graeme, and Maloy, Stuart. Mon .  
        "In-Situ Helium Implantation and TEM Investigation of Radiation Tolerance to Helium Bubble Damage in Equiaxed Nanocrystalline Tungsten and Ultrafine Tungsten-TiC Alloy".  Switzerland.  doi:10.3390/ma13030794.

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@article{osti_1598747,

  title        = {In-Situ Helium Implantation and TEM Investigation of Radiation Tolerance to Helium Bubble Damage in Equiaxed Nanocrystalline Tungsten and Ultrafine Tungsten-TiC Alloy},

  author       = {El Atwani, Osman and Unal, Kaan and Cunningham, William Streit and Fensin, Saryu and Hinks, Jonathan and Greaves, Graeme and Maloy, Stuart},

  abstractNote = {The use of ultrafine and nanocrystalline materials is a proposed pathway to mitigate irradiation damage in nuclear fusion components. Here, we examine the radiation tolerance of helium bubble formation in 85 nm (average grain size) nanocrystalline-equiaxed-grained tungsten and an ultrafine tungsten-TiC alloy under extreme low energy helium implantation at 1223 K via in-situ transmission electron microscope (TEM). Helium bubble damage evolution in terms of number density, size, and total volume contribution to grain matrices has been determined as a function of He+ implantation fluence. The outputs were compared to previously published results on severe plastically deformed (SPD) tungsten implanted under the same conditions. Large helium bubbles were formed on the grain boundaries and helium bubble damage evolution profiles are shown to differ among the different materials with less overall damage in the nanocrystalline tungsten. Compared to previous works, the results in this work indicate that the nanocrystalline tungsten should possess a fuzz formation threshold more than one order of magnitude higher than coarse-grained tungsten.},

  doi          = {10.3390/ma13030794},

  journal      = {Materials},

  number       = 3,

  volume       = 13,

  place        = {Switzerland},

  year         = {2020},

  month        = {2}

}

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Title: In-Situ Helium Implantation and TEM Investigation of Radiation Tolerance to Helium Bubble Damage in Equiaxed Nanocrystalline Tungsten and Ultrafine Tungsten-TiC Alloy

Abstract

Citation Formats

Self-trapping of helium in metals journal, November 1981

Tungsten surface evolution by helium bubble nucleation, growth and rupture journal, June 2013

Design of Stable Nanocrystalline Alloys journal, August 2012

Damage-tolerant nanotwinned metals with nanovoids under radiation environments journal, April 2015

Materials challenges in nuclear energy journal, February 2013

In situ studies on irradiation resistance of nanoporous Au through temperature-jump tests journal, January 2018

Response of unalloyed tungsten to mixed spectrum neutrons journal, July 2019

The role of grain size in He bubble formation: Implications for swelling resistance journal, February 2017

Enhanced radiation tolerance in nanocrystalline MgGa2O4 journal, June 2007

Mutation of vacancies to divacancies by helium trapping in molybdenum effect on the onset of percolation journal, April 1978

Study of defect evolution by TEM with in situ ion irradiation and coordinated modeling journal, June 2012

Ultrafine tungsten as a plasma-facing component in fusion devices: effect of high flux, high fluence low energy helium irradiation journal, June 2014

Unprecedented irradiation resistance of nanocrystalline tungsten with equiaxed nanocrystalline grains to dislocation loop accumulation journal, February 2019

Characterisation of radiation-damage microstructures by TEM journal, October 1994

Grain size threshold for enhanced irradiation resistance in nanocrystalline and ultrafine tungsten journal, February 2017

Reduction of helium embrittlement in stainless steel by finely dispersed TiC precipitates journal, January 1981

Microstructure evolution in tungsten during low-energy helium ion irradiation journal, December 2000

Synergistic effects of trace ZrC/Zr on the mechanical properties and microstructure of tungsten as plasma facing materials journal, May 2019

Microstructure and impact properties of ultra-fine grained tungsten alloys dispersed with TiC journal, May 1999

In-situ irradiation tolerance investigation of high strength ultrafine tungsten-titanium carbide alloy journal, February 2019

Neutron Irradiation Behavior of Tungsten journal, January 2013

TEM observation of the growth process of helium nanobubbles on tungsten: Nanostructure formation mechanism journal, November 2011

Radiation tolerance in a nanostructure: Is smaller better? journal, March 2008

A review of recent theoretical developments in the understanding of the migration of helium in metals and its interaction with lattice defects journal, January 1977

Formation process of tungsten nanostructure by the exposure to helium plasma under fusion relevant plasma conditions journal, August 2009

SRIM – The stopping and range of ions in matter (2010) journal, June 2010

Vacancy defect mobilities and binding energies obtained from annealing studies journal, February 1978

Low-energy helium plasma effects on textured micro-porous tungsten journal, April 2019

Migration mechanisms of helium in copper and tungsten journal, August 2014

Designing Radiation Resistance in Materials for Fusion Energy journal, July 2014

New Microscope and Ion Accelerators for Materials Investigations (MIAMI-2) system at the University of Huddersfield journal, July 2019

Are Nanoporous Materials Radiation Resistant? journal, June 2011

Self-trapping of helium in metals
journal, November 1981

Tungsten surface evolution by helium bubble nucleation, growth and rupture
journal, June 2013

Design of Stable Nanocrystalline Alloys
journal, August 2012

Damage-tolerant nanotwinned metals with nanovoids under radiation environments
journal, April 2015

Materials challenges in nuclear energy
journal, February 2013

In situ studies on irradiation resistance of nanoporous Au through temperature-jump tests
journal, January 2018

Response of unalloyed tungsten to mixed spectrum neutrons
journal, July 2019

The role of grain size in He bubble formation: Implications for swelling resistance
journal, February 2017

Enhanced radiation tolerance in nanocrystalline MgGa2O4
journal, June 2007

Mutation of vacancies to divacancies by helium trapping in molybdenum effect on the onset of percolation
journal, April 1978

Study of defect evolution by TEM with in situ ion irradiation and coordinated modeling
journal, June 2012

Ultrafine tungsten as a plasma-facing component in fusion devices: effect of high flux, high fluence low energy helium irradiation
journal, June 2014

Unprecedented irradiation resistance of nanocrystalline tungsten with equiaxed nanocrystalline grains to dislocation loop accumulation
journal, February 2019

Characterisation of radiation-damage microstructures by TEM
journal, October 1994

Grain size threshold for enhanced irradiation resistance in nanocrystalline and ultrafine tungsten
journal, February 2017

Reduction of helium embrittlement in stainless steel by finely dispersed TiC precipitates
journal, January 1981

Microstructure evolution in tungsten during low-energy helium ion irradiation
journal, December 2000

Synergistic effects of trace ZrC/Zr on the mechanical properties and microstructure of tungsten as plasma facing materials
journal, May 2019

Microstructure and impact properties of ultra-fine grained tungsten alloys dispersed with TiC
journal, May 1999

In-situ irradiation tolerance investigation of high strength ultrafine tungsten-titanium carbide alloy
journal, February 2019

Neutron Irradiation Behavior of Tungsten
journal, January 2013

TEM observation of the growth process of helium nanobubbles on tungsten: Nanostructure formation mechanism
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A review of recent theoretical developments in the understanding of the migration of helium in metals and its interaction with lattice defects
journal, January 1977

Formation process of tungsten nanostructure by the exposure to helium plasma under fusion relevant plasma conditions
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SRIM – The stopping and range of ions in matter (2010)
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Vacancy defect mobilities and binding energies obtained from annealing studies
journal, February 1978

Low-energy helium plasma effects on textured micro-porous tungsten
journal, April 2019

Migration mechanisms of helium in copper and tungsten
journal, August 2014

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journal, July 2014

New Microscope and Ion Accelerators for Materials Investigations (MIAMI-2) system at the University of Huddersfield
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