3D-AP and positron annihilation study of precipitation behavior in Cu-Cr-Zr alloy

M. Hatakeyama*, T. Toyama, J. Yang, Y. Nagai, M. Hasegawa, T. Ohkubo, M. Eldrup, B. N. Singh

*この論文の責任著者

研究成果: ジャーナルへの寄稿学術論文査読

68 被引用数 (Scopus)

抄録

Precipitation behavior in a Cu-0.78%Cr-0.13%Zr alloy during aging and reaging has been studied by laser-assisted local electrode three-dimensional atom probe (Laser-LEAP) and positron annihilation spectroscopy (PAS). After the prime aging at 460 °C, Cr clusters enriched with Zr were observed. Further reaging at 600 °C caused the clusters to grow to almost spherical (1 h) and thick platelets (4 h) Cr precipitates. Zr and impurities of Si and Fe were concentrated around the Cr precipitates, resulting in almost pure Cr cores sandwiched with interface regions enriched with Zr, Si and Fe. Probably the strain induced by the incoherency between BCC Cr precipitates with the matrix FCC Cu is relaxed by the enrichment of Zr, Si and Fe. Positron lifetime and coincidence Doppler broadening experiments suggest that vacancy-like defects form and associate with Cr atoms around the interfaces between the precipitates and the matrix.

本文言語英語
ページ(範囲)852-855
ページ数4
ジャーナルJournal of Nuclear Materials
386-388
C
DOI
出版ステータス出版済み - 2009/04/30

ASJC Scopus 主題領域

  • 核物理学および高エネルギー物理学
  • 材料科学一般
  • 原子力エネルギーおよび原子力工学

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