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Microstructural and durability evaluation of TiAlSiN coatings deposited on Ti6Al4V alloy under high-temperature conditions.

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Title: Microstructural and durability evaluation of TiAlSiN coatings deposited on Ti6Al4V alloy under high-temperature conditions.
Authors: Ceper, Burak1 (AUTHOR) ceperburak@gantep.edu.tr, Ozgurluk, Ozge2,3 (AUTHOR), Calıs, Ibrahim4 (AUTHOR), Icın, Kursat5 (AUTHOR), Ozgurluk, Yasin6 (AUTHOR), Tuncay, Mehmet Masum7 (AUTHOR)
Source: Surface & Coatings Technology. Jun2026, Vol. 529, pN.PAG-N.PAG. 1p.
Subjects: Protective coatings, Titanium alloys, Corrosion resistance, Scanning electron microscopy, Physical vapor deposition, X-ray diffraction, Energy dispersive X-ray spectroscopy, Oxidation
Abstract: Titanium-based alloys are widely used in the defense and aerospace industries due to their high specific strength. However, their resistance to oxidation and hot corrosion under high-temperature service conditions remains limited. In this study, a TiAlSiN coating with an approximate thickness of 1.5 μm was deposited on a Ti6Al4V alloy substrate by physical vapor deposition (PVD) to enhance its high-temperature performance. The coated specimens were subjected to isothermal oxidation tests at 900 °C for durations of 5, 25, and 50 h. In addition, isothermal hot corrosion tests were conducted for 1, 3, 5, and 10 h in the presence of molten salts composed of 45 wt% Na 2 SO 4 and 55 wt% V 2 O 5 The coating systems were comprehensively characterized before and after the oxidation and hot corrosion tests using scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), elemental mapping, and X-ray diffraction (XRD) analyses. The results demonstrated that the TiAlSiN coating formed a stable and protective surface layer under high-temperature conditions, significantly improving the oxidation and hot corrosion resistance of the Ti6Al4V alloy. These findings indicate that TiAlSiN-coated Ti6Al4V alloys exhibit promising potential for high-temperature applications, particularly in the defense and aerospace sectors. • TiAlSiN coatings (∼1.5 μm) were deposited on Ti6Al4V alloy using PVD to enhance high-temperature durability. • Coatings were systematically evaluated under 900 °C isothermal oxidation and Na 2 SO 4 –V 2 O 5 molten salt hot corrosion. • SEM, EDS, elemental mapping, and XRD analyses revealed the formation of a stable and protective surface layer. • Si addition in TiAlSiN coatings significantly improves thermal stability and oxidation/hot corrosion resistance. • Results provide practical guidance for designing durable coatings for aerospace and defense applications. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
Description
Abstract:Titanium-based alloys are widely used in the defense and aerospace industries due to their high specific strength. However, their resistance to oxidation and hot corrosion under high-temperature service conditions remains limited. In this study, a TiAlSiN coating with an approximate thickness of 1.5 μm was deposited on a Ti6Al4V alloy substrate by physical vapor deposition (PVD) to enhance its high-temperature performance. The coated specimens were subjected to isothermal oxidation tests at 900 °C for durations of 5, 25, and 50 h. In addition, isothermal hot corrosion tests were conducted for 1, 3, 5, and 10 h in the presence of molten salts composed of 45 wt% Na 2 SO 4 and 55 wt% V 2 O 5 The coating systems were comprehensively characterized before and after the oxidation and hot corrosion tests using scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), elemental mapping, and X-ray diffraction (XRD) analyses. The results demonstrated that the TiAlSiN coating formed a stable and protective surface layer under high-temperature conditions, significantly improving the oxidation and hot corrosion resistance of the Ti6Al4V alloy. These findings indicate that TiAlSiN-coated Ti6Al4V alloys exhibit promising potential for high-temperature applications, particularly in the defense and aerospace sectors. • TiAlSiN coatings (∼1.5 μm) were deposited on Ti6Al4V alloy using PVD to enhance high-temperature durability. • Coatings were systematically evaluated under 900 °C isothermal oxidation and Na 2 SO 4 –V 2 O 5 molten salt hot corrosion. • SEM, EDS, elemental mapping, and XRD analyses revealed the formation of a stable and protective surface layer. • Si addition in TiAlSiN coatings significantly improves thermal stability and oxidation/hot corrosion resistance. • Results provide practical guidance for designing durable coatings for aerospace and defense applications. [ABSTRACT FROM AUTHOR]
ISSN:02578972
DOI:10.1016/j.surfcoat.2026.133513