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Formation Mechanism of Nano-Strengthening Particles in Dispersion Strengthened W-Ti Alloys

Hiroyuki NOTO, Yoshimitsu HISHINUMA, Takeo MUROGA and Hideo BENOKI¹⁾

National Institute for Fusion Science, Toki, Gifu 509-5292, Japan

1)

Nippon Tungsten Co., Ltd., Saga 841-0203, Japan

(Received 2 February 2020 / Accepted 1 March 2020 / Published 15 April 2020)

Abstract

The realization of advanced fusion reactors rests upon improvements of plasma-facing materials for divertors. The toughness of tungsten is a critical issue for these improvements. As a solution, we developed dispersion-strengthened (DS) W-Ti alloys using a new process which is based on a combination of mechanical alloying (MA) and hot isostatic pressing. In this paper, the microstructure of new DS-W-Ti alloys and the formation mechanism of nano-strengthening particles are investigated. The produced DS-W-Ti alloys are dispersed with TiO₂. The chemical analysis shows that new precipitation processes occurred during the MA based on redox reactions between carbon and oxygen.

Copyright (c) 2020 The Japan Society of Plasma Science and Nuclear Fusion Research

Keywords

divertor, plasma-facing material, tungsten, dispersion strengthening, mechanical alloying, hot isostatic pressing

DOI: 10.1585/pfr.15.1205021

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References

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