engleski

Investigation of Microstructural Features of AlMg9 alloy

Foundry Al-Mg alloys found an important role in overall foundry industry of light metals due to their outstanding properties due to their high strength and ability of precipitation hardening obtained by higher magnesium content. Investigations of multicomponent technical AlMg9 alloy resulted in the qualitative and quantitative description of the solidification sequence at corresponding temperature and time. Influence of the cooling rate on the solidification and microstructure development of AlMg9 alloy has been investigated in this paper. Cooling has been performed at established rates of 0, 17 ; 3 ; 7, 55, and 150 K/s. Significant temperatures of phase transformations have been accompanied and identified through simultaneous and simple thermal analyses, as well as by numerical modeling by ThermoCalc which enabled developing of corresponding mathematical models. Microstructure analysis has been performed on optical and scanning electron micrographs which resulted in identification of corresponded phases: Al15(Fe, Mn)3Si2, Mg2Si and Al8Mg5 correlated with temperature intervals of their evolution. Microstructure features comprehended phase analysis, surface area, elongation and number of grains per unit area (NA) of established microstructures correlated to cooling rates. Obtained mathematical models related to cooling rate enable prediction of microstructure development of AlMg9 alloy during solidification in different cooling conditions and therefore evaluation of applicability for particular production technology.

AlMg9 alloy, solidification, microstructure features, thermal analysis, cooling rate

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