INVESTIGATION OF MECHANICAL PROPERTIES OF AL 7075 ALLOY SOLIDIFIED UNDER VIBRATION

Year 2023, Issue: 054, 212 - 223, 30.09.2023

Mustafa Gülmez Agah Aygahoğlu

https://doi.org/10.59313/jsr-a.1322502

Abstract

Al 7075 alloy is a material with high mechanical properties and limited plastic formability at room temperature. In some special applications, it may need to be obtained by casting. In this study, it is aimed to increase the strength of the Al 7075 alloy by solidification which has a wide range of applications in sectors such as automotive, aircraft and space defense industry, under mechanical vibration applied at different frequencies after casting. Microstructure examination, compression test and hardness measurement tests are conducted to determine the changes in the mechanical properties of Al 7075 alloy in different frequencies by after solidification under mechanical vibration. Maximum hardness value is obtained at 30 Hz frequency in mechanical vibrations applied at frequencies between 10-50 Hz. This hardness value is lower than the hardness values that can be obtained by precipitation hardening, but considerably higher than the material without heat treatment.

Keywords

Al 7075, Mechanical Vibration, Solidification.

References

• [1] Vorozhtsov et al., (2016). Theoretical and experimental investigations of the process of vibration treatment of liquid metals containing nanoparticles. JOM, 68, 3094–3100.
• [2] Taghavi, F.; Saghafian, H.; Kharrazi, Y.H.K. (2009). Study on the effect of prolonged mechanical vibration on the grain refinement and density of A356 aluminum alloy. Materals & Design, 30, 1604–1611.
• [3] Campbell, J.,(1981). Effect of vibration during solidification, International Metals Review, V:26, 71-108.
• [4] GUO et al., (2014). Grain refinement of Al–5%Cu aluminum alloy under mechanical vibration using meltable vibrating probe, Transactions of Nonferrous Metals Society of China V:24, 2489-2496.
• [5] Abu-Dheir et al., (2005). Silicon morphology modification in the eutectic Al-Si alloy using mechanical mold vibration. Materials Science and Engineering A. 393, 109–117.
• [6] Jiang et al., (2014). Combined effects of mechanical vibration and wall thickness on microstructure and mechanical properties of A356 aluminum alloy produced by expendable pattern shell casting, Materials Science and Engineering: A V: 619, 228-237
• [7] Al-Ethari et al., (2020). Influence of Mechanical and Thermo Mechanical Treatment on Micro Structure and Hardness of Al-ZnMg Alloy, Test Engineering and Management, V:83 , 11133 – 11141.
• [8] Kocatepe, K. (2007). Effect of low frequency vibration on porosity of LM25 and LM6 alloys. Materials and Design. 28, 1767–1775.
• [9] Nguyen-Thi et al., (2004). Tailoring of dendritic microstructure in solidification processing by crucible vibration. Journal of Crystal Growth. 275, 1579–1584.
• [10] Deshpande, J. U. (2006). Effect of mold vibration on the performance and casting characteristics of aluminum alloys (Unpublished Master’s Thesis). Worcester Polytechnic Instute, Massachusetts.
• [11] Mehta et al., (2019) Effects of Amplitude of Die Vibration on Cast Structure of Al4.5Cu Alloy, Inter Metalcast, V:13, 438–449.
• [12] Kudryashova et al., (2019) Optimizing the Conditions of Metal Solidification with Vibration, Metals , 9(3), 366
• [13] Alüminyum dökümde tane incelticiler, http://www.aluminyumdokum.org/aluminyum-dokumde-tane-incelticiler/