TY - JOUR
T1 - 3D-AP and positron annihilation study of precipitation behavior in Cu-Cr-Zr alloy
AU - Hatakeyama, M.
AU - Toyama, T.
AU - Yang, J.
AU - Nagai, Y.
AU - Hasegawa, M.
AU - Ohkubo, T.
AU - Eldrup, Morten Mostgaard
AU - Singh, Bachu Narain
PY - 2009
Y1 - 2009
N2 - 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 degrees C, Cr clusters enriched with Zr were observed. Further reaging at 600 degrees C caused the clusters to grow to almost spherical (I 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. (C) 2008 Elsevier B.V. All rights reserved.
AB - 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 degrees C, Cr clusters enriched with Zr were observed. Further reaging at 600 degrees C caused the clusters to grow to almost spherical (I 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. (C) 2008 Elsevier B.V. All rights reserved.
KW - Materials research
KW - Materials for fusion reactors
KW - Materialer til fusionsreaktorer
KW - Materialeforskning
U2 - 10.1016/j.jnucmat.2008.12.266
DO - 10.1016/j.jnucmat.2008.12.266
M3 - Journal article
SN - 0022-3115
VL - 386-388
SP - 852
EP - 855
JO - Journal of Nuclear Materials
JF - Journal of Nuclear Materials
ER -