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, M.
AU - Singh, B. N.
N1 - Funding Information:
This work is party supported by Grant-in-Aid for Scientific Research of the Ministry of Education, Science and Culture (Nos. 17002009 and 15106015). A part of this study was financially supported by the Budget for Nuclear Research of the Ministry of Education, Culture, Sports, Science and Technology, based on the screening and counseling by the Atomic Energy Commission.
PY - 2009/4/30
Y1 - 2009/4/30
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 °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.
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 °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.
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U2 - 10.1016/j.jnucmat.2008.12.266
DO - 10.1016/j.jnucmat.2008.12.266
M3 - Article
AN - SCOPUS:64649093708
SN - 0022-3115
VL - 386-388
SP - 852
EP - 855
JO - Journal of Nuclear Materials
JF - Journal of Nuclear Materials
IS - C
ER -