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A quantitative study by transmission electron microscopy of nanoscale precipitates in Al-Mg-Si alloys

1999; Taylor & Francis; Volume: 79; Issue: 6 Linguagem: Inglês

10.1080/01418619908210365

0141-8610

P. Donnadieu, M. Roux-Michollet, V. Chastagnier,

Microstructure and Mechanical Properties of Steels

Abstract We report a quantitative study of hardening precipitates carried out by means of transmission electron microscopy (TEM). Several TEM techniques are coupled to draw quantitative information without the help of a hypothesis on the precipitate structure and composition. The method is illustrated by an investigation of hardening precipitates in an Al-Mg-Si alloy 6056 (T6 temper). This microstructure consists of two precipitate families: lath and rod. The TEM study leads for the rod precipitate to a volume fraction of 1.3 ± 0.1% and a number density of 8.6 ± 0.4 × 106 cm3. We also obtained the rod size distribution and a mean rod diameter of 2.86nm. The lath precipitate volume fraction and density are also estimated but with less precision. The present results are discussed in comparison with a previous small-angle scattering study carried out on the same material.