Abstract
Micron sized Manganese particles of different percentage (0.2, 0.4, 0.6 and 0.8 wt%) have been added during the melting phase of the Al-2wt%Zn-2wt%Mg alloy. Mechanical testing and microstructural characterization have been performed to investigate the change incorporated by the addition of Mn particles. It was found that with the addition of Mn particles the ultimate tensile strength (UTS) of the alloy gradually improved up to an optimum percentage followed by rather reduction for the higher percentages. For optimum percentage of Mn (0.6% Mn) maximum 14% improvement in the UTS was achieved. The percentage of strain before fracture followed opposite trend to the UTS. Optical microscopy and scanning electron microscopy (SEM) of the alloys indicated that optimum percentage of Mn particles provided the microstructure with uniform dispersed second phase in the alloy matrix. These dispersed second phase effectively acted as a barrier to the dislocation motion, and consequently, improved the strength of the alloy as well as reduced the total elongation before fracture. Rockwell hardness test result showed that addition of Mn particles significantly improved the hardness of the alloy with successive addition. The hardness of the base alloy found to be improved by maximum up to 47.3% for 0.8% of Mn particles.
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