Effect of microstructure on the oxidation behavior of a β-solidified γ-TiAl based alloy after nitrogen ion implantation

The microstructure of the oxide layer of a β-solidifying γ-TiAl alloy (Ti-43.2Al-1.9V-1.1Nb-1.0Zr-0.2Gd-0.2B) after nitrogen ion implantation was studied after cyclic oxidation tests at 800 °C. Oxidation resulted in the formation of the continuous oxide scale, consisting of thin inner and outer TiO2...

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Published inIOP conference series. Materials Science and Engineering Vol. 1014; no. 1; pp. 12054 - 12057
Main Authors Panov, D O, Sokolovsky, V S, Stepanov, N D, Zherebtsov, S V, Novikov, V Y, Nochovnaya, N A, Panin, P V, Salishchev, G A
Format Journal Article
LanguageEnglish
Published Bristol IOP Publishing 01.01.2021
Subjects
Aluminum oxide
Boundaries
Depletion
Gadolinium
Intermetallic compounds
Internal oxidation
Ion implantation
Lamella
Microstructure
Nitrogen
Nitrogen ions
Oxidation
Oxidation tests
Scale (corrosion)
Titanium aluminides
Titanium base alloys
Titanium dioxide
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Summary:The microstructure of the oxide layer of a β-solidifying γ-TiAl alloy (Ti-43.2Al-1.9V-1.1Nb-1.0Zr-0.2Gd-0.2B) after nitrogen ion implantation was studied after cyclic oxidation tests at 800 °C. Oxidation resulted in the formation of the continuous oxide scale, consisting of thin inner and outer TiO2, dense Al2O3 and mixed Al2O3 + TiO2 layers. It was revealed that the nitrogen ion implantation considerably inhibited the growth of the oxide scale, internal oxidation and Al-depleted zones. Thick Al-depleted zones and a mixture of Al2O3 and TiO2 were formed along the colony boundaries. Tooth-shaped Al-depleted zones propagated along the lamella boundaries. In addition, the presence of Gd-rich particles in the oxide scale promoted the formation of Al2O3 particles in surrounding areas and increased the depth of the oxide scale around.
ISSN:1757-8981
1757-899X
DOI:10.1088/1757-899X/1014/1/012054