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dc.contributor.advisorMarthinsen, Knutnb_NO
dc.contributor.advisorPedersen, Ketillnb_NO
dc.contributor.advisorWestermann, Idanb_NO
dc.contributor.authorRemøe, Magnus Sætersdalnb_NO
dc.date.accessioned2014-12-19T13:29:03Z
dc.date.available2014-12-19T13:29:03Z
dc.date.created2014-10-07nb_NO
dc.date.issued2014nb_NO
dc.identifier753407nb_NO
dc.identifierntnudaim:11966nb_NO
dc.identifier.urihttp://hdl.handle.net/11250/249653
dc.description.abstractExperiments were conducted to attempt to understand the effect of different alloying elements on the ductility of Al-Mg-Si alloys. Four alloys with different concentrations of Si, Mg, Fe, Mn and Cu were selected for examination. The strength-ductility relationship was evaluated by tensile tests, and microscopic analysis in light optical microscope, SEM and TEM was conducted to investigate grain-, constituent-, precipitatation- and fracture characteristics.Excess-Si (Mg/Si>1.73) was found to have a detrimental effect on the ductility of Al-Mg-Si alloys, without the presence of additional alloying elements. This alloy had an elongation to fracture of 23.1%, where failure occurred partly intergranularly, and was seemingly due to poor grain boundary characteristics. Adding Fe and Cu improved the ductility (and strength) to 42.9% elongation, and the change was related to the formation of secondary-phase particles, resulting in less free Si for embrittlement of grain boundaries. The best ductility, 79.2% elongation, was found by introducing Mn, which in addition to the above-mentioned changed the recrystallization behavior.The most desirable combination of tensile strength (456 MPa) and ductility (64.6%) was found in a balanced alloy (Mg/Si~1.73) with an addition of both Mn and Cu. Primarily, Cu was associated with an increase in strength, by changing the precipitation behavior and precipitate characteristics. Mn contributed to both an increase in strength and ductility, by forming dispersoids which influenced the recrystallization behavior, resulting in a fine subgrain structure.nb_NO
dc.languageengnb_NO
dc.publisherInstitutt for materialteknologinb_NO
dc.titleThe Effect of Alloying Elements on the Ductility of Al-Mg-Si Alloysnb_NO
dc.typeMaster thesisnb_NO
dc.source.pagenumber104nb_NO
dc.contributor.departmentNorges teknisk-naturvitenskapelige universitet, Fakultet for naturvitenskap og teknologi, Institutt for materialteknologinb_NO


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