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Microstructure Formation of Al-5 mass%Mg Alloy Melts by Interaction with Silica

Kim Sun-Ki, Ha Seong-Ho, Kim Bong-Hwan, Yoon Young-Ok, Lim Hyun-Kyu, Kim Shae K., Kim Yong-Jig

Archives of Metallurgy and Materials

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2021

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Vol. 66, iss. 4

947--950

EN

Dissolution of Si in Al-5 mass%Mg alloy melt by the reduction of SiO2 and its effect on microstructure formation of the alloy after solidification were investigated. Al-5 mass%Mg alloy without silica powder had approximately 0.05 mass%Si as an impurity. No significant difference in Si content was observed after the reaction with silica for 10 min, while the Si content increased up to about 0.12 mass% after 30 min. From the microstructure analysis and calculation of Scheil-Gulliver cooling, it was considered that as-cast microstructures of Al-5 mass%Mg-1 mass% SiO2 alloys had the distribution of eutectic phase particles, which are comprised of β-Al3Mg2 and Mg2Si phases. Based on the phase diagrams, only limited amount of Mg can be selectively removed by silica depending on the ratio of Si and Mg. Addition of silica of more than approximately 1.5 mass% in Al-5 mass%Mg alloy led to the formation of spinel and removal of both mg and Al from the melt.

2

Microstructural characterization of cast magnesium matrix composites by Raman microscopy

Malik M. A., Braszczyńska-Malik K. N., Majchrzak K.

Archives of Foundry Engineering

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2013

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Vol. 13, iss. 1

95--98

EN

Cast magnesium matrix composites reinforced with silicon carbide particles were investigated by using Raman microscopy. 3C, 4H and 6H polytypes of SiC particles were identified in the investigated composites. Additionally, Mg2Si compound was detected by Raman microscopy in the composites microstructure.

3

Microstructural analysis of AM50/Mg2Si cast magnesium composites

Malik M. A., Majchrzak K., Braszczyńska-Malik K. N.

Archives of Foundry Engineering

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2012

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Vol. 12, iss. 4

109-112

EN

AM50/Mg2Si composites containing 5.7 wt. % and 9.9 wt. %. of Mg2Si reinforcing phase were prepared successfully by casting method. The microstructure of the cast AM50/Mg2Si magnesium matrix composites was investigated by light microscopy and X-ray diffractometry (XRD). The microstructure of these composites was characterized by the presence of \alfa-phase (a solid solution of aluminium in magnesium), Mg17Al12 (\gamma-phase), Al8Mn5 and Mg2Si. It was demonstrated that the Mg2Si phase was formed mainly as primary dendrites and eutectic.

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Powłoki Mg2Si natryskiwane zimnym gazem

Godlewska E., Żórawski W., Mars K.

Inżynieria Materiałowa

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2011

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Vol. 32, nr 4

421-424

PL

Natryskiwanie zimnym gazem jest najnowszą metodą natryskiwania cieplnego. Dzięki uniknięciu niekorzystnego wpływu temperatury na cząstki materiału powłokowego i podłoże pozwala ona uzyskać właściwości powłok nieosiągalne dotychczas konwencjonalnymi metodami natryskiwania cieplnego. W artykule przedstawiono podstawy procesu natryskiwania zimnym gazem oraz jego zastosowania w przemyśle. Pokazano ponadto wyniki badań własnych mikrostruktury i analizy składu fazowego powłoki Mg2Si otrzymanej przez natrysk zimnym gazem.

EN

Cold spraying is the state-of-the-art thermal spraying. By avoiding disadvantageous effects of temperature on the powder particles and the substrate, this method allows obtaining coating properties which are unattainable by conventional thermal spray technology. The paper presents fundamental issues of the cold spraying process and its industrial applications as well as some results of microstructural and compositional studies of a cold sprayed Mg2Si coating.