Effect of Al-5Ti-0.25C-0.25B and Al-5Ti-1B Master Alloys on the Microstructure and Mechanical Properties of Al-9.5Si-1.5Cu-0.8Mn-0.6Mg Alloy

The goal of this research was to determine how the master alloys Al-5Ti-0.25C-0.25B and Al-5Ti-1B affected the mechanical properties and structural characteristics of the alloy Al-9.5Si-1.5Cu-0.8Mn-0.6Mg. Field emission scanning electron microscopy (FE-SEM) was used to probe the microscopic composition, and the mechanical properties were evaluated using tensile testing. The results showed that, by adding 0.5% Al-5Ti-0.25C-0.25B master alloy and 0.5% Al-5Ti-1B master alloy, the alpha-Al dendrites can be significantly refined. In the extrusion state, the ultimate tensile strength and elongation with 0.5% Al-5Ti-0.25C-0.25B master alloy reached 380 MPa and 11.2%, which were 5.5% and 22.4% higher than no refinement, respectively. The elongation of the samples with the Al-5Ti-1B alloy addition increased from 9% to 11.9%, which is attributed to the fact that more pronounced complete recrystallization occurred during the extrusion heat treatment.

Automated summary

The aim of this research was to investigate the influence of Al-5Ti-0.25C-0.25B and Al-5Ti-1B master alloys on the mechanical properties and structural characteristics of Al-9.5Si-1.5Cu-0.8Mn-0.6Mg alloy. Field emission scanning electron microscopy (FE-SEM) was used to analyze the microstructure, while tensile testing was conducted to evaluate the mechanical properties. The results demonstrated that the addition of 0.5% Al-5Ti-0.25C-0.25B and 0.5% Al-5Ti-1B master alloys significantly refined the alpha-Al dendrites and improved the ultimate tensile strength and elongation of the extruded alloy.