Oxidation behaviour of the near α-titanium alloy IMI 834

Abstract

Oxidation behaviour of the near α α-titanium alloy IMI 834 was investigated over a range of temperatures, from 600-800°C, in air. Specimens were solution-treated in the α α + β β and β β phase fields for 1 h and 1/2 h, respectively and cooled in air to room temperature. The solution treated samples were subjected to stabilization treatment at 700°C for 2 h, followed by cooling in air. Oxidation behaviour of these samples was studied from 600-800°C in air, for 50 h. The morphology of the scales formed was examined by SEM and the phases present in the scales were characterized by X-ray diffraction. While there was little oxidation at 600°C, the rate of oxidation increased at higher temperatures. In general, the rate of oxidation was found to be more in the α α + β β treated condition than that in the β β treated one. The results are discussed in terms of the characteristics of the oxide film formed under different conditions.

Effect of thermal oxidation process on fatigue behavior of Ti-4Al-2V alloy

“…This is in agreement with the fact that the alloy is a near alpha type alloy [9,10]. These results are also in good agreement with [6,[11][12][13] that studied the Ti6Al-4 V alloy using by XRD.…”

Fabrication and oxidation behavior of Cr2AlC coating on Ti6242 alloy

“…Similar to other titanium and TiAl alloys, due to limited Al content in the alloy, no protective Al 2 O 3 scale, but mixed or multilayered oxide scale formed on the specimen surface during oxidation [1][2][3][4][5][6]. Oxygen could diffuse into the alloy through the surface scale to further oxidize the beneath alloy.…”

“…However, the service temperatures of these alloys are limited to approximately 500°C, mainly due to the insufficient environmental resistance. The degradation mechanisms are characterized by formation of rapidly growing non-protective oxide scales containing predominately TiO 2 , and embrittlement of the subsurface zone by dissolution of interstitials (O and N) [3][4][5][6]. To solve these problems, surface coatings are the efficient ways.…”

Influence of Laser Treatment on the Creep of the Ti-6Al-4V Alloy

“…[1,2] One major factor limiting the life of titanium alloys in service is their degradation within a gaseous environment, in particular, the one containing oxygen at elevated temperatures during long-term use. [3] The sensitivity of titanium alloys to high-temperature exposure is a wellknown phenomenon. When titanium alloys are heated to temperatures above approximately 1073 K (800°C), oxygen, hydrogen, and nitrogen can penetrate into them.…”

“…[4] The interaction of titanium alloys with oxygen not only causes losses in the material because of the formation of oxides but also causes embrittlement in the subsurface zone of the component because of oxygen enrichment. [3] Titanium alloys are one of the most technologically important materials in the aeronautics and aerospace fields for their high strength and low density. However, this material does not possess satisfactory tribological properties.…”