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- W2377985364 abstract "Tel: +31 15 27 86320 Fax: +31 15 27 88303 e-mail: s.m.hautakangas@tudelft.nl Positron lifetime spectroscopy has been applied to quantify the restoration of free volume defects (vacancies, dislocations and nano-cracks) formed during plastic deformation of a commercial aluminium AA2024 alloy in an underaged (UA) state. Plastic deformation of an underaged aluminium alloy increases the average positron lifetime from an initial value of 182 ps to 209 ps. After deformation the positron lifetime value decreases with time and approaches its initial value at a rate depending on the aging temperature. The results show that the nano-structure of an underaged material after deformation and aging at 65-70 °C has the same positron annihilation (PA) characteristics as the material before deformation. From this we conclude that the solute in the matrix is capable of closing the open volume defects caused by plastic deformation. The healing process seems to be a thermally activated process with an activation energy of 0.91eV, which corresponds to that of Cu and Mg pipe diffusion in Al matrix." @default.
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- W2377985364 date "2007-01-01" @default.
- W2377985364 modified "2023-09-26" @default.
- W2377985364 title "THE ROLE OF THE AGING TEMPERATURE ON THE SELF HEALING KINETICS IN AN UNDERAGED AA2024 ALUMINIUM ALLOY" @default.
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