WEKO3
アイテム
Phase stability of fine precipitates and its effect on nano-hardness during isothermal annealing of ITER-grade CuCrZr
https://repo.qst.go.jp/records/2003028
https://repo.qst.go.jp/records/20030282beed0ef-757b-48f5-a5ec-643937dd5f43
| アイテムタイプ | 学術雑誌論文 / Journal Article(1) | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 公開日 | 2026-03-25 | |||||||||||
| タイトル | ||||||||||||
| タイトル | Phase stability of fine precipitates and its effect on nano-hardness during isothermal annealing of ITER-grade CuCrZr | |||||||||||
| 言語 | en | |||||||||||
| 言語 | ||||||||||||
| 言語 | eng | |||||||||||
| 資源タイプ | ||||||||||||
| 資源タイプ識別子 | http://purl.org/coar/resource_type/c_6501 | |||||||||||
| 資源タイプ | journal article | |||||||||||
| 著者 |
Kano Sho
× Kano Sho
× Hamaguchi Dai
× Nozawa Takashi
|
|||||||||||
| 抄録 | ||||||||||||
| 内容記述タイプ | Abstract | |||||||||||
| 内容記述 | The CuCrZr alloy is a promising candidate for cooling pipes in DEMO fusion reactors, and its secondary phases play a critical role in irradiation integrity and creep properties. This study investigated the stability of fine precipitates and their impact on nano-hardness during isothermal annealing of ITER-grade CuCrZr. Nano-indentation results showed a parabolic decrease in hardness as the annealing temperature increased. The observed softening behavior was governed by two distinct thermally activated processes separated at approximately 673 K. TEM/STEM observations of the as-received specimen confirmed the presence of fine precipitates dispersed uniformly within the intragranular regions. These precipitates were ∼4 nm in size, had a number density of ∼1 × 1023 m⁻³, and exhibited Ashby-Brown, moiré, and loop contrasts. STEM-EDS analysis revealed that these were Cr-rich precipitates and that coarse precipitates, Cr- and/or Zr-rich, were also present. However, the contribution of the coarse precipitates to strengthening was likely negligible due to their low number density. The parameter of Orowan-type dispersion strengthening associated with the fine Cr-rich precipitates () showed a consistent trend with hardness softening. This suggests that the hardening coefficient attributable to these precipitates is ∼60 Pa/m. Maximum softening occurred at 300–400 MPa in the 873 K specimen, with a precipitate size of ∼10 nm and a number density of ∼2 × 10²² m⁻³. | |||||||||||
| 書誌情報 |
Fusion Engineering and Design 巻 227, 号 115732, 発行日 2026-03 |
|||||||||||
| DOI | ||||||||||||
| 識別子タイプ | DOI | |||||||||||
| 関連識別子 | 10.1016/j.fusengdes.2026.115732 | |||||||||||
