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

Research output: Contribution to journalArticlepeer-review

40 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)852-855
Number of pages4
JournalJournal of Nuclear Materials
Volume386-388
Issue numberC
DOIs
Publication statusPublished - 2009 Apr 30

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Materials Science(all)
  • Nuclear Energy and Engineering

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