Temperature dependent positron trapping in polycrystalline copper and aluminium tubes after tensile deformation
Doppler broadening measurements on polycrystalline aluminium and copper tubes were performed in-situ during tensile tests, and in between times temperature dependent in different stages of the deformation. The temperature dependent Doppler broadening measurements in deformed copper revealed a transition of the positron trapping behaviour between 20 MPa and 30 MPa which distinguished between weakly and strongly deformed samples. In aluminium no such differences were observed. The measurements were analysed in terms of a 3-state trapping model which provided numerical values for the trapping rates and the binding energy of the positron to the dislocation line.
Bibliographic Reference: Article: Physical Review B (1998)
Record Number: 199811393 / Last updated on: 1998-11-10
Original language: en
Available languages: en