High temperature indentation of helium-implanted tungsten

Gibson, J. S.; Roberts, Steve; Armstrong, David E.J.

doi:10.1016/j.msea.2014.12.034

Cited by 55 publications

(31 citation statements)

References 31 publications

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“…Nanoindentation -whereby an indenter of a specific geometry is driven into the surface of a material under an applied load -has been been widely used to determine the mechanical properties of thin films, either in the form of hard coatings [2,3] or modified surface layers [4,5]. The application of this technique and related nanomechanical testing at elevated temperatures is a relatively recent, but increasingly popular field, with indentation temperatures and publications rapidly increasing year-on-year [6][7][8][9][10][11][12][13][14][15][16]. It is also a potential breakthrough in the development of high temperature materials.…”

Section: Introductionmentioning

confidence: 99%

On extracting mechanical properties from nanoindentation at temperatures up to 1000 °C

Gibson

Schröders

Zehnder

et al. 2017

Extreme Mechanics Letters

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Section: Introductionmentioning

confidence: 99%

On extracting mechanical properties from nanoindentation at temperatures up to 1000 °C

Gibson

Schröders

Zehnder

et al. 2017

Extreme Mechanics Letters

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“…To simulate fusion environment for W, ion-irradiation is extensively in use [5][6][7][8][9][10] . A realistic estimation of the actual irradiation hardening behaviour by ion-irradiation experiments in W is essential in order to apply it as a plasma facing component in fusion power reactors.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Ion-Irradiation Hardening of Tungsten Single Crystals by Nanoindentation Technique Considering Material Pile-Up Effect

et al. 2017

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Ion-irradiation hardening of pure tungsten (W) single crystal was evaluated by nanoindentation (NI) technique considering material pileup effect. Pure W single crystals of (001) surface orientation were ion-irradiated with 6.4 MeV Fe 3+ to 0.1 dpa, 1 dpa or 2 dpa at 573 K. The irradiation hardening was evaluated by means of NI measurements with elastic-modulus-based correction (EMC) method [C. Heintze et al.: J. Nucl. Mater. 472 (2016) 196-205]. The effect of material pile-up in tungsten was so signi cant that the bulk equivalent hardness values by EMC method were about 70% and 85% of uncorrected results for irradiated and unirradiated W(001), respectively. The ion-irradiation hardening values by EMC based method were approximately 40%, 50% and 60% of uncorrected results for 0.1 dpa, 1 dpa and 2 dpa, respectively. The measured maximum pile-up height was higher for irradiated W(001) than for unirradiated W(001) at each indentation depth. An averaged pileup height that was associated with the actual area of contact of pile up obtained from EMC hardness showed different responses to ion-irradiation depending on the indentation depth.

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“…In the previous studies on ion-irradiation effects in W [4,[12][13][14] , nano-indentation method was adopted to measure the ionirradiation hardening because of the limitation of the damaged depth to less than several microns. Himei et al reported that helium in the dual-beam irradiation will enhance the growth of dislocation loops and cavities and therefore increase hardening [4] .…”

Section: Introductionmentioning

confidence: 99%

Evaluation of helium effect on ion-irradiation hardening in pure tungsten by nano-indentation method

Zhang

Hasenhuetl

Yabuuchi

et al. 2016

Nuclear Materials and Energy

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a b s t r a c tAs-received and recrystallized pure tungsten (W) were irradiated with 6.4 MeV Fe 3 + up to 2 dpa with or without He + at 300 °C, 500 °C, 700 °C and 1000 °C respectively. Irradiation hardening was measured by the nano-indentation method. An equation to evaluate the bulk equivalent hardness was derived on the assumption that the geometrically necessary dislocation (GND) densities at an indentation depth were the same before and after irradiation. Ion-irradiation always induces hardening in both as-received and recrystallized W at all the experiment temperatures. In the case of single-beam irradiation, the recrystallized W exhibited higher hardening than as-received one. The effect of helium on the irradiation hardening is dependent on the material condition: as-received W showed an additional hardening by helium at all the irradiation temperatures, while in recrystallized W the hardening was not affected by helium below 700 °C.

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High temperature indentation of helium-implanted tungsten

Cited by 55 publications

References 31 publications

On extracting mechanical properties from nanoindentation at temperatures up to 1000 °C

On extracting mechanical properties from nanoindentation at temperatures up to 1000 °C

Evaluation of Ion-Irradiation Hardening of Tungsten Single Crystals by Nanoindentation Technique Considering Material Pile-Up Effect

Evaluation of helium effect on ion-irradiation hardening in pure tungsten by nano-indentation method

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