Title: Temperature Dependent Positron Trapping in Copper and Aluminium Tubes after Tensile Deformation.
Citation: Physical Review B vol. 60 p. 179-190
Publication Year: 1999
JRC N°: JRC17681
URI: http://publications.jrc.ec.europa.eu/repository/handle/JRC17681
Type: Articles in periodicals and books
Abstract: 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 in-situ measurements yielded sensitivity limits of position annihilation to the effects of plastic deformation at resolved shear stresses of tau = (4+-1) MPa and tau = (9=-1) MPa in aluminium and copper, respectively. These values correspond to a dislocation density of ro approx. 2-3.10 12 m-2. The temperature dependent Doppler broadening measurements in deformed copper revealed a transition of the positron trapping behaviour between 20 MP and 30 MPa which let us distinguish 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.
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