Evaluation of ion-irradiation hardening of tungsten single crystals by nanoindentation technique considering material pile-up effect

Eva Hasenhuetl; Ryuta Kasada; Zhexian Zhang; Kiyohiro Yabuuchi; Yen Jui Huang; Akihiko Kimura

doi:10.2320/matertrans.M2016437

Evaluation of ion-irradiation hardening of tungsten single crystals by nanoindentation technique considering material pile-up effect

Eva Hasenhuetl, Ryuta Kasada, Zhexian Zhang, Kiyohiro Yabuuchi, Yen Jui Huang, Akihiko Kimura

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

11 Citations (Scopus)

Abstract

Ion-irradiation hardening of pure tungsten (W) single crystal was evaluated by nanoindentation (NI) technique considering material pile-up effect. Pure W single crystals of (001) surface orientation were ion-irradiated with 6.4 MeV Fe³⁺ 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 significant 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 pile-up 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.

Original language	English
Pages (from-to)	749-756
Number of pages	8
Journal	Materials Transactions
Volume	58
Issue number	5
DOIs	https://doi.org/10.2320/matertrans.M2016437
Publication status	Published - 2017
Externally published	Yes

Keywords

Hardness
Ion-irradiation hardening
Nanoindentation
Pile-up
Tungsten

ASJC Scopus subject areas

Materials Science(all)
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering

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10.2320/matertrans.M2016437

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@article{deaeedd59b30417bb454295452c851cc,

title = "Evaluation of ion-irradiation hardening of tungsten single crystals by nanoindentation technique considering material pile-up effect",

abstract = "Ion-irradiation hardening of pure tungsten (W) single crystal was evaluated by nanoindentation (NI) technique considering material pile-up effect. Pure W single crystals of (001) surface orientation were ion-irradiated with 6.4 MeV Fe3+ 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 significant 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 pile-up 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.",

keywords = "Hardness, Ion-irradiation hardening, Nanoindentation, Pile-up, Tungsten",

author = "Eva Hasenhuetl and Ryuta Kasada and Zhexian Zhang and Kiyohiro Yabuuchi and Huang, {Yen Jui} and Akihiko Kimura",

note = "Funding Information: Associate Prof. Kondo is thanked for the assistance in operation of Atomic Force Microscope. The financial support of the first author by the Ministry of Education, Culture, Sports, Science and Technology, MEXT, scholarship of the Japanese Government (1.10.2014 - 30.09.2016) is acknowledged. Publisher Copyright: {\textcopyright}2017 The Japan Institute of Metals and Materials.",

year = "2017",

doi = "10.2320/matertrans.M2016437",

language = "English",

volume = "58",

pages = "749--756",

journal = "Materials Transactions",

issn = "1345-9678",

publisher = "Japan Institute of Metals (JIM)",

number = "5",

}

TY - JOUR

T1 - Evaluation of ion-irradiation hardening of tungsten single crystals by nanoindentation technique considering material pile-up effect

AU - Hasenhuetl, Eva

AU - Kasada, Ryuta

AU - Zhang, Zhexian

AU - Yabuuchi, Kiyohiro

AU - Huang, Yen Jui

AU - Kimura, Akihiko

N1 - Funding Information: Associate Prof. Kondo is thanked for the assistance in operation of Atomic Force Microscope. The financial support of the first author by the Ministry of Education, Culture, Sports, Science and Technology, MEXT, scholarship of the Japanese Government (1.10.2014 - 30.09.2016) is acknowledged. Publisher Copyright: ©2017 The Japan Institute of Metals and Materials.

PY - 2017

Y1 - 2017

N2 - Ion-irradiation hardening of pure tungsten (W) single crystal was evaluated by nanoindentation (NI) technique considering material pile-up effect. Pure W single crystals of (001) surface orientation were ion-irradiated with 6.4 MeV Fe3+ 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 significant 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 pile-up 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.

AB - Ion-irradiation hardening of pure tungsten (W) single crystal was evaluated by nanoindentation (NI) technique considering material pile-up effect. Pure W single crystals of (001) surface orientation were ion-irradiated with 6.4 MeV Fe3+ 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 significant 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 pile-up 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.

KW - Hardness

KW - Ion-irradiation hardening

KW - Nanoindentation

KW - Pile-up

KW - Tungsten

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JO - Materials Transactions

JF - Materials Transactions

IS - 5

ER -

Evaluation of ion-irradiation hardening of tungsten single crystals by nanoindentation technique considering material pile-up effect

Abstract

Keywords

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