Plasma and Fusion Research

Volume 15, 1205021 (2020)

Rapid Communications

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
Nippon Tungsten Co., Ltd., Saga 841-0203, Japan
(Received 2 February 2020 / Accepted 1 March 2020 / Published 15 April 2020)


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.


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

DOI: 10.1585/pfr.15.1205021


  • [1] H. Kurishita et al., Materials Transactions 54, No.4, 456 (2013).
  • [2] The Japan Institute of Metals, Physical Chemistry of Metals, ISBN4-88903-011-5.
  • [3] H. Noto et al., PRICM-10 proceedings (2019) pp.158-162.
  • [4] M. Koyama et al., J. Nucl. Mater. 329-333, 442 (2004).