The Comparison of Effects of Ultrasonic Treatment, SIMA Process and Al-۵Ti-۱B Grain Refiner on the Microstructure and Mechanical Properties of Al–۱۵%Mg۲Si in-situ Composite

The effect of Strain-Induced Melt-Activated (SIMA) Process, ultrasonic treatment (UST) and Al-۵Ti-۱B refiner on the microstructure and globularity of Al–۱۵%Mg۲Si composite was studied. Deformation of ۲۵% were used. After deformation the samples were heated at ۵۶۰, ۵۸۰ and ۵۹۵ °C for ۵, ۱۰, ۲۰ and ۴۰ min. The composite was treated with different amounts of the Ti concentrations and ultrasonic treatment with different power. Microstructural study was carried out on the alloy. It was observed that SIMA process, ultrasonic treatment and Al-۵Ti-۱B refiner has caused the globular morphology of Mg۲Si particles. The results showed that for the desired microstructures of the alloy during SIMA process, the optimum temperature and time are ۵۹۵ °C and ۲۰ min respectively. Optimum amount of Ti refiner is ۱ wt.% and power for UST is ۱۸۰۰W. After applying the SIMA process, Al-۵Ti-۱B master alloy and ultrasonic treatment, the strength and engagement have increased. This means that tensile strength increases from ۲۵۱ MPa to ۳۰۳ MPa and elongation percentage improves from ۲.۱ to ۳.۴, respectively.

کلیدواژه ها:

Deformation ، Semisolid ، SIMA ، Mg۲Si phase ، Modification