TY - JOUR
T1 - A comparative study of precipitate composition and volume fraction in an Al–Zn–Mg alloy using tomographic atom probe and small-angle X-ray scattering
AU - Deschamps, A.
AU - Bigot, A.
AU - Livet, F.
AU - Auger, P.
AU - Bréchet, Y.
PY - 2001/10
Y1 - 2001/10
N2 - The composition and volume fraction of precipitates in an Al–Zn–Mg alloy are investigated by tomographic atom probe (TAP), small-angle X-ray scattering (SAXS) and transmission electron microscopy. Three states of ageing are characterized in detail: slightly underaged, containing mostly the metastable η′ phase; slightly overaged, containing η′ and the stable η phase; overaged, containing only η. The different methods are in full agreement about the last state, with a composition of η close to the bulk composition MgZn2, and a volume fraction of 4.5%. The TAP and SAXS results obtained for microstructures with smaller precipitates show some discrepancy. Notably, the TAP predicts a higher aluminium concentration in the precipitates as well as a higher volume fraction. The artefacts of the two techniques are reviewed in detail and a critical analysis of the results is carried out.
AB - The composition and volume fraction of precipitates in an Al–Zn–Mg alloy are investigated by tomographic atom probe (TAP), small-angle X-ray scattering (SAXS) and transmission electron microscopy. Three states of ageing are characterized in detail: slightly underaged, containing mostly the metastable η′ phase; slightly overaged, containing η′ and the stable η phase; overaged, containing only η. The different methods are in full agreement about the last state, with a composition of η close to the bulk composition MgZn2, and a volume fraction of 4.5%. The TAP and SAXS results obtained for microstructures with smaller precipitates show some discrepancy. Notably, the TAP predicts a higher aluminium concentration in the precipitates as well as a higher volume fraction. The artefacts of the two techniques are reviewed in detail and a critical analysis of the results is carried out.
UR - https://www.scopus.com/pages/publications/0042015981
U2 - 10.1080/01418610108217154
DO - 10.1080/01418610108217154
M3 - Article
AN - SCOPUS:0042015981
SN - 0141-8610
VL - 81
SP - 2391
EP - 2414
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
IS - 10
ER -