Helium effects on recovery and recrystallization of powder metallurgically processed tungsten

Akira Hasegawa; Takeshi Miyazawa; Daichi Itou; Takaya Hattori; Kenta Yohida; Shuhei Nogami

doi:10.1088/1402-4896/ab408d

Helium effects on recovery and recrystallization of powder metallurgically processed tungsten

Akira Hasegawa, Takeshi Miyazawa, Daichi Itou, Takaya Hattori, Kenta Yohida, Shuhei Nogami

ENG - Quantum Science and Energy Engineering

Research output: Contribution to journal › Conference article › peer-review

2 Citations (Scopus)

Abstract

To study the effects of helium (He) produced by the nuclear transmutation of 14 MeV neutron irradiation on the stability of grain microstructure of tungsten (W)-fabricated through a powder metallurgically (PM) process-high energy He and post implantation experiments were conducted. The recovery of worked structure and recrystallization behavior were examined using hardness measurement and microstructural observation. He with a concentration of 20 appm was implanted homogeneously though the specimen thickness below 100 °C. Post-implantation annealing was then conducted from 1100 °C to 1500 °C in vacuum. The hardness of the PM-W specimen increased after the He implantation, and the decrease of the hardening through the annealing was suppressed in the He-implanted specimens. Metallographic observations demonstrated that the dislocation cell structure in the grain of He-implanted PM-W was retained even after the 10 h annealing at 1500 °C. In conclusion, the 20 appm He suppressed the recovery of cell structure and recrystallization of the PM-W up to 1500 °C.

Original language	English
Article number	014016
Journal	Physica Scripta
Volume	2020
Issue number	T171
DOIs	https://doi.org/10.1088/1402-4896/ab408d
Publication status	Published - 2020 Jan 1
Event	17th International Conference on Plasma-Facing Materials and Components for Fusion Applications, PFMC 2019 - Eindhoven, Netherlands Duration: 2019 May 20 → 2019 May 24

Keywords

Hardness
Helium effects
Microstructure
Recovery
Tungsten

ASJC Scopus subject areas

Atomic and Molecular Physics, and Optics
Mathematical Physics
Condensed Matter Physics

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title = "Helium effects on recovery and recrystallization of powder metallurgically processed tungsten",

abstract = "To study the effects of helium (He) produced by the nuclear transmutation of 14 MeV neutron irradiation on the stability of grain microstructure of tungsten (W)-fabricated through a powder metallurgically (PM) process-high energy He and post implantation experiments were conducted. The recovery of worked structure and recrystallization behavior were examined using hardness measurement and microstructural observation. He with a concentration of 20 appm was implanted homogeneously though the specimen thickness below 100 °C. Post-implantation annealing was then conducted from 1100 °C to 1500 °C in vacuum. The hardness of the PM-W specimen increased after the He implantation, and the decrease of the hardening through the annealing was suppressed in the He-implanted specimens. Metallographic observations demonstrated that the dislocation cell structure in the grain of He-implanted PM-W was retained even after the 10 h annealing at 1500 °C. In conclusion, the 20 appm He suppressed the recovery of cell structure and recrystallization of the PM-W up to 1500 °C.",

keywords = "Hardness, Helium effects, Microstructure, Recovery, Tungsten",

author = "Akira Hasegawa and Takeshi Miyazawa and Daichi Itou and Takaya Hattori and Kenta Yohida and Shuhei Nogami",

note = "Funding Information: Authors are grateful to the entire staff of the Cyclotron and Radioisotope Center (CYRIC) of Tohoku University for allowing the use of their cyclotron accelerator. We would also like to thank the staff of radioisotope laboratory of the Faculty of Engineering of Tohoku University, and the staff of hot laboratory of IMR Oarai of Tohoku University. This study was supported by JSPS KAKENHI, Grant Number 17H01364.; 17th International Conference on Plasma-Facing Materials and Components for Fusion Applications, PFMC 2019 ; Conference date: 20-05-2019 Through 24-05-2019",

year = "2020",

month = jan,

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doi = "10.1088/1402-4896/ab408d",

language = "English",

volume = "2020",

journal = "Physica Scripta",

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TY - JOUR

T1 - Helium effects on recovery and recrystallization of powder metallurgically processed tungsten

AU - Hasegawa, Akira

AU - Miyazawa, Takeshi

AU - Itou, Daichi

AU - Hattori, Takaya

AU - Yohida, Kenta

AU - Nogami, Shuhei

N1 - Funding Information: Authors are grateful to the entire staff of the Cyclotron and Radioisotope Center (CYRIC) of Tohoku University for allowing the use of their cyclotron accelerator. We would also like to thank the staff of radioisotope laboratory of the Faculty of Engineering of Tohoku University, and the staff of hot laboratory of IMR Oarai of Tohoku University. This study was supported by JSPS KAKENHI, Grant Number 17H01364.

PY - 2020/1/1

Y1 - 2020/1/1

N2 - To study the effects of helium (He) produced by the nuclear transmutation of 14 MeV neutron irradiation on the stability of grain microstructure of tungsten (W)-fabricated through a powder metallurgically (PM) process-high energy He and post implantation experiments were conducted. The recovery of worked structure and recrystallization behavior were examined using hardness measurement and microstructural observation. He with a concentration of 20 appm was implanted homogeneously though the specimen thickness below 100 °C. Post-implantation annealing was then conducted from 1100 °C to 1500 °C in vacuum. The hardness of the PM-W specimen increased after the He implantation, and the decrease of the hardening through the annealing was suppressed in the He-implanted specimens. Metallographic observations demonstrated that the dislocation cell structure in the grain of He-implanted PM-W was retained even after the 10 h annealing at 1500 °C. In conclusion, the 20 appm He suppressed the recovery of cell structure and recrystallization of the PM-W up to 1500 °C.

AB - To study the effects of helium (He) produced by the nuclear transmutation of 14 MeV neutron irradiation on the stability of grain microstructure of tungsten (W)-fabricated through a powder metallurgically (PM) process-high energy He and post implantation experiments were conducted. The recovery of worked structure and recrystallization behavior were examined using hardness measurement and microstructural observation. He with a concentration of 20 appm was implanted homogeneously though the specimen thickness below 100 °C. Post-implantation annealing was then conducted from 1100 °C to 1500 °C in vacuum. The hardness of the PM-W specimen increased after the He implantation, and the decrease of the hardening through the annealing was suppressed in the He-implanted specimens. Metallographic observations demonstrated that the dislocation cell structure in the grain of He-implanted PM-W was retained even after the 10 h annealing at 1500 °C. In conclusion, the 20 appm He suppressed the recovery of cell structure and recrystallization of the PM-W up to 1500 °C.

KW - Hardness

KW - Helium effects

KW - Microstructure

KW - Recovery

KW - Tungsten

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