TY - JOUR
T1 - Coincidence doppler broadening study of the pre-precipitation stage of an Al-Cu-Mg-Ag alloy
AU - Nagai, Y.
AU - Honma, T.
AU - Tang, Z.
AU - Hono, K.
AU - Hasegawa, M.
N1 - Funding Information:
ACKNOWLEDGEMENTS This work was partly supported by grant-in-aids for scientific research 11750565, 12640334 and 13305044 and by the Special Coordination Funds for Promoting Science and Technology on ‘Nanohetero Metallic Materials’ from the Ministry of Education, Culture, Sports, Science and Technology.
PY - 2002/5
Y1 - 2002/5
N2 - The role of Ag in the pre-precipitation process of an Al-1.9at.%Cu- 0.3 at.% Mg-0.2at.% Ag alloy has been investigated in view of the interaction between the quenched-in vacancies and Ag atoms. Positron annihilation methods, coincidence Doppler broadening of positron annihilation radiation and positron lifetime spectroscopies, and transmission electron microscopy have been employed. In an as-quenched state, quenched-in vacancies V in the Al- 1.9at.%Cu-0.3at.%Mg~0.2at.%Ag alloy are associated with Ag atoms as well as Mg atoms (V-Mg-Ag) while V-Mg complexes are formed in the A1 1.9at.%Cu-0.3at.%Mg alloy. The recovery of the vacancies after 15s ageing at 180°C is suppressed by the existence of Ag atoms. These results indicate that the V-Mg complexes are stabilized by the associated Ag atoms, which promotes the co-clustering of Ag and Mg atoms by ageing rather than by the formation of dislocation loops.
AB - The role of Ag in the pre-precipitation process of an Al-1.9at.%Cu- 0.3 at.% Mg-0.2at.% Ag alloy has been investigated in view of the interaction between the quenched-in vacancies and Ag atoms. Positron annihilation methods, coincidence Doppler broadening of positron annihilation radiation and positron lifetime spectroscopies, and transmission electron microscopy have been employed. In an as-quenched state, quenched-in vacancies V in the Al- 1.9at.%Cu-0.3at.%Mg~0.2at.%Ag alloy are associated with Ag atoms as well as Mg atoms (V-Mg-Ag) while V-Mg complexes are formed in the A1 1.9at.%Cu-0.3at.%Mg alloy. The recovery of the vacancies after 15s ageing at 180°C is suppressed by the existence of Ag atoms. These results indicate that the V-Mg complexes are stabilized by the associated Ag atoms, which promotes the co-clustering of Ag and Mg atoms by ageing rather than by the formation of dislocation loops.
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U2 - 10.1080/01418610208240037
DO - 10.1080/01418610208240037
M3 - Article
AN - SCOPUS:0036249360
VL - 82
SP - 1559
EP - 1572
JO - Philosophical Magazine A: Physics of Condensed Matter, Structure, Defects and Mechanical Properties
JF - Philosophical Magazine A: Physics of Condensed Matter, Structure, Defects and Mechanical Properties
SN - 0141-8610
IS - 8
ER -