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Titanium alloy LT26A; 𝛽 solution treatment; tensile properties; dynamic strain ageing (DSA).

Tensile behaviour of the near 𝛼 titanium alloy, Ti–6Al–5Zr–0.5Mo–0.25Si (LT26A), was investigated in (𝛼+𝛽) as well as 𝛽 treated condition, over a wide range of temperature from RT to 823 K. It was observed that there were distinct serrations on the load-elongation curves of the 𝛼 + 𝛽 treated material at intermediate temperatures from 623 to 723 K. Tensile tests at 673 K over a wide range of strain rate from 0.052 to 5.60 (× 10^-2) s^-1 showed negative strain rate sensitivity. Thus, occurrence of DSA was confirmed. It was established from the measured activation energy for DSA that it was essentially controlled by diffusion of the solid solution strengthener silicon in the matrix.

Anil Kumar Nag¹ K V U Praveen¹ Vakil Singh¹

1. Department of Metallurgical Engineering, Institute of Technology, Banaras Hindu University, Varanasi 221 005, India

Published

April 2006

Manuscript received

20 August 2005

Manuscript revised

15 October 2005