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In this study, the effect of multidirectional forging (MDF) was studied on the microstructure and mechanical properties of Ti-modified Si_P/ZA22 composite containing 4 and 8 wt. % Si. The forging process was performed at 100 °C by two and five passes. Based on the obtained results, Ti modification refined the coarse primary dendrites, and reduced the size of primary Si (Si_P) particle as well as grains. Applying MDF also gradually eliminated the dendritic structure, promoted fine distribution of Si_P particles, second phases, and porosities in the microstructure. According to the image analysis results, the average size of Si_P particles in as-cast composite reduced from 25 and 30 μm to about 6 and 7 μm, respectively in 5-pass MDFed composites containing 4 and 8 wt. % Si. The mechanical properties results also showed work softening during the MDF where after two-pass MDF the hardness and tensile strength of the base sample reduced by 30 and 25%, while its elongation and toughness improved by 120 and 325%, respectively. In MDFed composites, the presence of Si_P particles maintains the hardness and strength. According to the results, in the case of 2-pass MDFed composite containing 4 wt. % Si the hardness and tensile strength reduced by 18 and 2%, respectively, but the elongation and toughness increased by 25 and 175%, respectively.  

Keywords: Zn-22Al alloy, Composite, Silicon, Titanium, Multidirectional forging, Mechanical properties, Severe plastic deformation

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