K V Sai Srinadh
Articles written in Bulletin of Materials Science
Volume 27 Issue 4 August 2004 pp 347-354 Alloys and Steels
Oxidation behaviour of the near 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 + 𝛽 and 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 + 𝛽 treated condition than that in the 𝛽 treated one. The results are discussed in terms of the characteristics of the oxide film formed under different conditions.
Volume 30 Issue 6 December 2007 pp 595-600 Alloys and Steels
Extremely fine coherent precipitates of ordered Ti3Al and relatively coarse incoherent precipitates of 𝑆2 silicide exist together in the near 𝛼-titanium alloy, Timetal 834, in the dual phase matrix of primary 𝛼 and transformed 𝛽. In order to assess the role of these precipitates, three heat treatments viz. WQ, WQ–A and WQ–OA, were given to have no precipitates, Ti3Al and silicide and only silicide precipitates in the respective conditions. Tensile properties in the above three heat treated conditions were determined at room temperature, 673 K and 873 K. It was observed that largely Ti3Al precipitates were responsible for increase in the yield strength and decrease in ductility in this alloy.
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