Naslov
Influence of the Cooling Rate on the Microstructure Development of the AlMg9 alloy

Autori
Zovko Brodarac, Zdenka ; Mrvar, Primož ; Unkić, Faruk ; Medved, Jožef

Izvornik
Livarski vestnik (0024-5135) 56 (2009), 3; 130-148

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
Al-Mg alloy ; cooling rate ; microstructure ; grain size

Sažetak
Foundry Al-Mg alloys assigned to the high pressure die casting have imposed itself in the recent time due to their high strength and ability of precipitation hardening for compositions above the 7 wt. % Mg. Influence of the cooling rate on the significant temperatures of phase changes during solidification and the grain size of AlMg9 alloy have been investigated in this paper. Cooling has been performed by the established rates of 5, 15, 30 and 100 [K/s]. Phase changes have been accompanied and identified through simultaneous and simple thermal analysis. Physical models of significant temperature and cooling rate dependence have been made. Solidification simulation has been performed through the finite elements method by the ProCast program, which has been compared with the real cooling curves. Beside this, the grain size (G) and the number of grains per surface area (NA) for each cooling rate have been determined as well as its correlation. Microstructure analysis has been performed on the optical, as well as on the scanning electron microscope (SEM) which results in visual recognition of individual phases on their morphology basis. Chemical composition determination of each phase was carried out by the energy dispersive specter (EDS). Phases Alx(MnFe)ySiz, Mg2Si and Al2Mg have been determined in the microstructure.

Izvorni jezik
Engleski

Znanstvena područja
Metalurgija

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