Enhancing mechanical properties and corrosion performance of AA6063 aluminum alloys through constrained groove pressing technique
(1. Department of Mechanical Engineering, Tongling Vocational and Technical College, Tongling 244061, China;
2. School of Metallurgy and Materials Engineering, Iran University of Science and Technology, Tehran, Iran;
3. Department of Engineering, Mahabad Branch, Islamic Azad University, Mahabad, Iran;
4. Department of Mechanical Engineering, University of Zakho, Zakho, Kurdistan Region, Iraq;
5. Department of Mechanical Engineering, Faculty of Engineering, University of Maragheh, Maragheh, Iran;
6. School of Denizli Vocational Technology, Program of Machine, Pamukkale University, Denizli, Turkey;
7. Department of Mechanical and Metal Technology, Technical Sciences Vocational School, Isparta University of Applied Sciences, Isparta, Turkey)
2. School of Metallurgy and Materials Engineering, Iran University of Science and Technology, Tehran, Iran;
3. Department of Engineering, Mahabad Branch, Islamic Azad University, Mahabad, Iran;
4. Department of Mechanical Engineering, University of Zakho, Zakho, Kurdistan Region, Iraq;
5. Department of Mechanical Engineering, Faculty of Engineering, University of Maragheh, Maragheh, Iran;
6. School of Denizli Vocational Technology, Program of Machine, Pamukkale University, Denizli, Turkey;
7. Department of Mechanical and Metal Technology, Technical Sciences Vocational School, Isparta University of Applied Sciences, Isparta, Turkey)
Abstract: The use of a constrained groove pressing (CGP) method to plastically deform AA6063 aluminum alloy led to the improved surface properties. It was found that hardness magnitude is dramatically improved and its uniformity is considerably decreased after the first pass, while subsequent passes result in better hardness behavior for the processed material. Also, the elongated grains formed in the first pass of the CGP are gradually converted to the equiaxed counterparts by adding pass numbers. Eventually, higher corrosion resistance of the sample by imposing the CGP process is related to the quick formation of passivation film and the change in the morphology of the second phase and precipitates which hinder their electrochemical reactions and decrease the potential localized attack sites.
Key words: mechanical properties; corrosion resistance; aluminum alloy; constrained groove pressing technique; grain refinement; hardness distribution homogeneity