Poisoning Effect of Combined Addition of Fe and Mn on Carbon Inoculation of Mg-3%Al Alloy

Wang, Ming Hua; Du, Jun; Li, Wen Fang

doi:10.4028/www.scientific.net/amr.393-395.226

Cited by 2 publications

(1 citation statement)

References 23 publications

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“…The previous section determined that the use of a fine filter within the well combined with Ar bubbling was the most effective for increasing mechanical properties and will be referred to as "filter + Ar bubbling" hereafter. with C inoculation is often described to be Al 4 C 3 [2,5,9,17,18,26,87,89,92,95,107,121,135,136,138,140,[200][201][202]216,224,[230][231][232][233][234][235][236]242,244,249,250,253] but recent research point towards Al 2 MgC 2 [132,139,232,248,251]. The observations from Figure 5-14c show indications of the remnants of these phases by the presence of C and O around the blocky Al 8 Mn 5 as they are highly hydrophobic as described by Equation 17and observations in literature [132,139,248].…”

Section: In-situ Grain Refinement Using C 2 Clmentioning

confidence: 99%

Inclusion removal and grain refinement of magnesium alloy castings

Elsayed¹

2021

Preprint

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Magnesium alloys show promise to be materials for lightweighting of automotive and aerospace vehicles improving fuel efficiencies and vehicle performance. A majority of magnesium alloy components are produced using casting where susceptibility to forming inclusions and coarse grain sizes could result. Development of effective inclusion removal techniques and better understanding of grain refinement of magnesium alloys could help in improving their mechanical properties to advance them to more structurally demanding applications. This research aimed to develop an environmentally friendly alternative to the grain refinement and inclusion removal capabilities of carbon based hexachloroethane as it releases dioxins, chlorine gas and corrodes foundry equipment. A secondary aim was to pioneer in-situ neutron diffraction to examine the solidification of magnesium alloys. The research involved preparing tensile samples of AZ91E magnesium alloy using permanent mould casting. Inclusion removal was conducted by using filtration and argon gas bubbling. Castings grain refined using hexachloroethane (0.25, 0.50 and 0.75 wt.%) were compared against ex-situ aluminum-silicon carbide and in-situ aluminum-carbon based grain refiners combined with filtration and argon gas bubbling. Further, in-situ neutron diffraction was utilized for phase analysis and fraction solid determination of magnesium-zinc and magnesium-aluminum alloys. There was a significant improvement in yield strength, ultimate tensile strength and elongation with filtration plus argon bubbling, carbon inoculation or both filtration plus argon bubbling and carbon inoculation. The results indicated that the mechanism of the observed ~20% reduction in grain sizes with carbon inoculation (hexachloroethane, ex-situ aluminum-silicon carbide and in-situ aluminum-carbon) was explained through duplex nucleation of Mn-Al and Al-Mg-C-O (likely Al2MgC2) phases. Finally, in-situ neutron diffraction was used to follow the formation of Mg17Al12 eutectic phase in a magnesium-9 wt.% aluminum alloy. For the magnesium-zinc alloys, in-situ neutron diffraction enabled characterization of the effects of zirconium to the fraction solid growth of (1010), (0002) and (1011) α-Mg planes. The societal and environmental impact of this research is significant. There is a clear demonstration of alternatives to the universally used hexachloroethane grain refiner promoting harmful emissions. Improved mechanical properties resulting from new grain refinement and iv inclusion filtration are a major advancement in promoting weight reduction, improved castability and decreased environmental impact for automotive and aerospace industries.

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