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On the intermetallic constituents in the sodium-induced edge cracking of hot-rolled AA5182 aluminum alloys

Mofarrehi Mohammadreza, Javidani Mousa et Chen X-Grant. (2021). On the intermetallic constituents in the sodium-induced edge cracking of hot-rolled AA5182 aluminum alloys. Philosophical Magazine, 101, (16), p. 1849-1870.

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URL officielle: http://dx.doi.org/doi:10.1080/14786435.2021.193736...

Résumé

The productivity and recovery of hot-rolled Al-Mg-Mn sheets often suffer from sodium-induced edge cracking. In this study, AA5182 ingots with different levels of Na were prepared by direct-chill (DC) casting, and were then subsequently subjected to homogenisation and hot-rolling processes. The edge crack occurrence during hot rolling in the pass #11 (84% reduction) and pass #18 (96% reduction) was investigated, with special attention paid to the impact of intermetallic constituents in the ingot subsurface region, where all edge cracks were initiated. Correlations between the susceptibility to edge cracking, enriched intermetallic constituents in the inverse segregation zone, Mg2Si cavitation, meniscus bands, and Na contamination were observed. The results revealed that Fe-rich intermetallic particles were not involved in crack formation, while Mg2Si particles had a strong tendency to debond from the Al matrix and form cavities at the edges of the rolled strip. The higher the Na content, the more severe the Mg2Si cavitation, and consequently, the higher the susceptibility to edge cracking. Numerous debonded Mg2Si particles contaminated with Na in the subsurface region provided favourable conditions for crack initiation and propagation. The role of the meniscus bands on the large and profound edge cracks was also elaborated.

Type de document:Article publié dans une revue avec comité d'évaluation
Volume:101
Numéro:16
Pages:p. 1849-1870
Version évaluée par les pairs:Oui
Date:14 Juin 2021
Sujets:Sciences naturelles et génie > Génie
Sciences naturelles et génie > Génie > Génie des matériaux et génie métallurgique
Sciences naturelles et génie > Sciences appliquées
Département, module, service et unité de recherche:Départements et modules > Département des sciences appliquées > Module d'ingénierie
Mots-clés:AA5182 aluminum alloys, edge cracking, hot rolling, Na contamination, Mg2Si cavitation, alliages d'aluminium AA5182, fissuration des bords, laminage à chaud, contamination Na, cavitation Mg2Si
Déposé le:21 oct. 2021 20:36
Dernière modification:21 oct. 2021 20:36
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