Corrosion Behavior of Shot-Peened Ti6Al4V Alloy Produced via Pressure-Assisted Sintering
Avcu E. Abakay E. Yıldıran Avcu Y. Çalım E. Gökalp İ. Iakovakis E. Koç F.G. Yamanoglu R. Akıncı A. Guney M.
December 2023Multidisciplinary Digital Publishing Institute (MDPI)
Coatings
2023#13Issue 12
For the first time, the present study investigates the corrosion, surface, and subsurface properties of a shot-peened Ti6Al4V powder metallurgical alloy produced via pressure-assisted sintering. Shot peening yielded a fine-grained microstructure beneath the surface down to 100 microns, showing that it caused severe plastic deformation. XRD analysis revealed that the sizes of the crystallites in unpeened and shot-peened Ti6Al4V alloy samples were 48.59 nm and 27.26 nm, respectively, indicating a substantial reduction in crystallite size with shot peening. Cross-sectional hardness maps of shot-peened samples showed a work-hardened surface layer, indicating a ~17% increase in near-surface hardness relative to unpeened samples. Three-dimensional surface topographies showed that shot peening yielded uniform peaks and valleys, with a maximum peak height of 4.83 μm and depth of 6.56 μm. With shot peening, the corrosion potential shifted from −0.386 V to −0.175 V, showing that the passive layer developed faster and was more stable than the unpeened sample, improving corrosion resistance. As determined via XRD analysis, the increased grain refinement (i.e., the number of grain boundaries) and the subsequent accumulation of TiO2 and Al5Ti3V2 compounds through shot peening also suggested the effective formation of a protective passive layer. As demonstrated via electrochemical impedance spectroscopy, the formation of this passive film improved the corrosion resistance of the alloy. The findings will likely advance surface engineering and corrosion research, enabling safer and more productive shot peening in corrosion-critical applications.
grain refinement , hardness , powder metallurgy , shot peening , titanium alloys , topography
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Department of Mechanical Engineering, Kocaeli University, Kocaeli, 41001, Turkey
Ford Otosan Ihsaniye Automotive Vocational School, Kocaeli University, Kocaeli, 41650, Turkey
Department of Metallurgy and Materials Engineering, Sakarya University, Sakarya, 54050, Turkey
Department of Metallurgy and Materials Engineering, Kocaeli University, Kocaeli, 41001, Turkey
Department of Mechanical Aerospace and Civil Engineering, The University of Manchester, Manchester, M13 9PL, United Kingdom
Department of Civil and Environmental Engineering, Nazarbayev University, Astana, 010000, Kazakhstan
The Environment & Resource Efficiency Cluster (EREC), Nazarbayev University, Astana, 010000, Kazakhstan
Department of Mechanical Engineering
Ford Otosan Ihsaniye Automotive Vocational School
Department of Metallurgy and Materials Engineering
Department of Metallurgy and Materials Engineering
Department of Mechanical Aerospace and Civil Engineering
Department of Civil and Environmental Engineering
The Environment & Resource Efficiency Cluster (EREC)
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