Nucleation mechanism of discontinuous precipitation in MgAl alloys and relation with the morphology

D. Duly, Y. Brechet

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Abstract

The nucleation rate of discontinuous precipitation in MgAl has been measured as a function of temperature, initial grain size and solute content. From these measurements, it appears that at high temperatures (T ≥ 220°C) all precipitation nodules nucleate via Fournelle and Clark's mechanism, whereas at lower temperatures (T ∼ 140°C), at least one of the mechanisms identified by Tu and Turnbull or Purdy and Lange is also active. The proportion of double seam nodules determined by optical microscopy decreases from more than 1/2 to 0 when the temperature increases. In the low temperature domain, this behaviour is in agreement with that predicted by Baumann, Williams and Michael.

Original languageEnglish
Pages (from-to)3035-3043
Number of pages9
JournalActa Metallurgica Et Materialia
Volume42
Issue number9
DOIs
Publication statusPublished - Sep 1994
Externally publishedYes

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