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Effect of grain refinement on the strength and corrosion of AZ31 magnesium alloy following severe plastic deformation

  • Gas tungsten arc welds made on wrought magnesium AZ31 plate have been characterized for corrosion in saline solution (3.5% NaCl). Microstructural changes induced by the welding process resulted in different environmental behaviour of each zone (BM-base metal, HAZ-heat affected zone and FZ-fusion zone). The faster kinetics of corrosion in FZ and especially HAZ are attributed to (a) the coarse microstructure, consisting of large grains, and (b) very small amounts of ß-phase in the grain boundaries. Also, hardness traverses have shown that these zones are weaker than the base metal. Based on the significant effect of grain size on strength in magnesium alloys, the weld metal grains have been systematically refined using controlled oscillation during welding, and by adding a grain refiner to the weld pool. Detailed microstructure analyses have been carried out and the relationships between corrosion behaviour, mechanical properties and microstructure (grain refinement and second-phasesGas tungsten arc welds made on wrought magnesium AZ31 plate have been characterized for corrosion in saline solution (3.5% NaCl). Microstructural changes induced by the welding process resulted in different environmental behaviour of each zone (BM-base metal, HAZ-heat affected zone and FZ-fusion zone). The faster kinetics of corrosion in FZ and especially HAZ are attributed to (a) the coarse microstructure, consisting of large grains, and (b) very small amounts of ß-phase in the grain boundaries. Also, hardness traverses have shown that these zones are weaker than the base metal. Based on the significant effect of grain size on strength in magnesium alloys, the weld metal grains have been systematically refined using controlled oscillation during welding, and by adding a grain refiner to the weld pool. Detailed microstructure analyses have been carried out and the relationships between corrosion behaviour, mechanical properties and microstructure (grain refinement and second-phases formation) are highlighted.zeige mehrzeige weniger

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Metadaten
Autor*innen:Dan Eliezer, G.B. Hamu, Carl Edward Cross, Thomas Böllinghaus
Persönliche Herausgeber*innen:T. Galloway
Dokumenttyp:Beitrag zu einem Sammelband
Veröffentlichungsform:Verlagsliteratur
Sprache:Englisch
Titel des übergeordneten Werkes (Englisch):Light metals 2006
Jahr der Erstveröffentlichung:2006
Herausgeber (Institution):Minerals, Metals and Materials Society / Aluminum Committee
Verlag:TMS, the Minerals, Metals & Materials Society
Verlagsort:Warrendale
Jahrgang/Band:135
Erste Seite:1
Letzte Seite:4
Veranstaltung:135th Annual Meeting of the Minerals, Metals & Materials Society
Veranstaltungsort:San Antonio, TX, USA
Beginndatum der Veranstaltung:2006-03-12
Enddatum der Veranstaltung:2006-03-16
ISBN:978-0-87339-619-6
Verfügbarkeit des Dokuments:Physisches Exemplar in der Bibliothek der BAM vorhanden ("Hardcopy Access")
Bibliotheksstandort:Sonderstandort: Publica-Schrank
Datum der Freischaltung:19.02.2016
Referierte Publikation:Nein
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