Abstract

SUAREZ, M. A. et al. The effect of Mg content on microstructure in Al-12wt. %Zn-x Mg Alloy. J. appl. res. technol [online]. 2009, vol.7, n.2, pp.153-162. ISSN 2448-6736.

The effect of adding different Mg contents to an Al-12wt.%Zn master alloy was experimentally investigated. The Al-Zn-Mg alloys were unidirectionally solidified as a function of solidification parameters, temperature gradient G_L, solidification front velocity V, and composition C₀. The alloys were solidified with a constant temperature gradient (G_L=2500K/m) in the solidification front velocity range from 4X10^-6m/s to 1.7X10^-4m/s. The resulting microstructure was characterized to investigate the effect of solidification front velocities and composition on primary dendrite arm spacing, volume percentage of eutectic in interdendritic regions and τ intermetallic phase in α-Al matrix. Theoretical models for the dendrite arm spacing and dendrite tip radius have been compared with the experimental observations.

Keywords : aluminum alloys; dendrite arm spacing; solidification; predictions; microstructure.

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