Abstract
One of the major aims of the modern materials foundry industry is the achievement of advanced mechanical properties of metals, especially of light non-ferrous alloys such as aluminum. Usually an alloying process is applied to obtain the required properties of aluminum alloys. However, the presented work describes an alternative approach through the application of vibration treatment, modification by ultrafine powder and a combination of these two methods. Microstructural studies followed by image analysis revealed the refinement of α-Al grains with an increase in the Si network area around them. As evidence, the improvement of the mechanical properties of Al casting alloy was detected. It was found that the alloys subjected to the vibration treatment displayed an increase in tensile and yield strengths by 20% and 10%, respectively.
Highlights
In recent years, the materials manufacturing industry has become more and more interested in aluminum alloys production, especially Al-Si alloys
Results of yield strength (YS) measurements performed on 356 Al alloy: 1—after vibration by 100 Hz; 2—after vibration by 150 Hz; 4—after modification by ultrafine powder modifier; 5—after by 100 Hz; 2—after vibration by 150 Hz; 4—after modification by ultrafine powder modifier; 5—after modification by ultrafine powder modifier followed by 100 Hz vibration; 6—after modification by ultrafine powder modifier followed by 150 Hz vibration; As cast—unmodified and untreated alloy
In microstructures well as the microstructure of the alloy subjected to the modification only (Figure 7(4)), the typical α-Al subjected to the combined approach, that is, by modification followed by vibration treatment
Summary
The materials manufacturing industry has become more and more interested in aluminum alloys production, especially Al-Si alloys. The majority of these works explain the effect of vibration treatment and attribute it to obtaining small globular aluminum grains was described in the investment casting of Al alloy by the cavitation phenomenon [15,16]. The similar effect of obtaining small globular aluminum grains was at the same time the treatment improved the mechanical properties of the Al casting alloy [21]. We can evenisfind the of improvement of physical and mechanical properties particles, and a combined treatment approach oneffect the solidification effect and mechanical properties of simultaneously, e.g., Okayasu et al. Through image analysis, macroand microstructures will investigated, pointed out that the electric conductivity was about.
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