J. Phys. Colloques
Volume 47, Numéro C2, Mars 198632 nd International Field Emission Symposium / 32ème Symposium International d'Emission de Champ
|Page(s)||C2-245 - C2-250|
J. Phys. Colloques 47 (1986) C2-245-C2-250
THE QUANTITATIVE ANALYSIS OF COPPER IN IRON BASED ALLOYSG.M. WORRALL et G.D.W. SMITH
Department of Metallurgy and Science of Materials, University of Oxford, Parks Road, GB-Oxford OX1 3PH, Great Britain
The quantitative analysis of low copper levels in iron based alloys has been investigated using the Oxford VG FIM 100 atom probe, in particular the optimum experimental conditions necessary to give the correct stoichiometry. Variables investigated include pulse fraction, specimen temperature, crystallographic plane, the presence of image gas and the effect of laser-pulses compared to voltage-pulses. Careful control of certain experimental conditions, especially temperature and pulse fraction, is necessary to give the correct copper level. These results are being applied to an investigation of the role of copper in the embrittlement of low alloy steels.