Nucleation mechanism of discontinuous precipitation in Mg-Al alloys and relation with the morphology
Journal Article
·
· Acta Metallurgica et Materialia; (United States)
- Cambridge Univ. (United Kingdom). Dept. of Engineering
- ENSEEG, Saint Martin d'Heres (France). Lab. de Thermodynamique et Physico-Chimie Metallurgiques
The nucleation rate of discontinuous precipitation in Mg-Al has been measured as a function of temperature, initial grain size and solute content. From these measurements, it appears that at high temperatures (T [ge] 220 C) all precipitation nodules nucleate via Fournelle and Clark's mechanism, whereas at lower temperatures (T [approximately] 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 behavior is in agreement with that predicted by Baumann, Williams and Michael.
- OSTI ID:
- 6930138
- Journal Information:
- Acta Metallurgica et Materialia; (United States), Vol. 42:9; ISSN 0956-7151
- Country of Publication:
- United States
- Language:
- English
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