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

被引：75

作者：

Deschamps, A

Bigot, A

Livet, F

Auger, P

Bréchet, Y

Blavette, D

机构：

[1] Domaine Univ Grenoble, Ecole Natl Super Electrochim & Electromet Grenobl, Thermodynam & Physicochim Met Lab, St Martin Dheres, France

[2] Fac Sci Rouen, Grp Met Phys, Rouen, France

[3] Pechiney Ctr Rech Voreppe, F-38341 Voreppe, France

来源：

PHILOSOPHICAL MAGAZINE A-PHYSICS OF CONDENSED MATTER STRUCTURE DEFECTS AND MECHANICAL PROPERTIES | 2001年 / 81卷 / 10期

关键词：

D O I：

10.1080/01418610110038439

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

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 eta' phase; slightly overaged, containing eta' and the stable eta phase; overaged, containing only eta. The different methods are in full agreement about the last state, with a composition of eta 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.

引用

页码：2391 / 2414

页数：24

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