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<p>We investigate the creep behavior of a model Ti-6 wt.% Al alloy under uniaxial tension from room temperature to 200 °C, representative of the equiaxed α (hcp) phase commonly present in engineering two-phase titanium alloys. This study is motivated by the observed thermal mitigation of dwell fatigue in titanium alloys across this temperature range. A comprehensive set of tensile and creep experiments spanning a wide range of strain rates reveals distinct mechanical responses. Tensile stress–strain curves exhibit a pronounced yield point and weak serrated flow at 120 and 200&#xa0;°C. While strain rate sensitivity remains nearly constant with temperature, work hardening displays a two-stage behavior in double logarithmic stress–strain rate plots. Primary creep follows a power-law dependence of strain on time but is characterized by unusual discontinuities in the strain rate. Microstructural observations indicate that deformation during creep occurs via widely spaced, heterogeneous slip bands associated with short range order. Activation volume measurements and temperature jump tests were conducted to elucidate the governing rate-controlling mechanisms, offering insights into the underlying creep kinetics and deformation processes.</p>

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The temperature sensitivity of creep near room temperature in a Ti-6wt%Al alloy

  • 期刊论文

  • 发表日期：

    2025年8月19日

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  • Shreya Mukherjee,
  • Girish Bojjawar,
  • Atasi Ghosh,
  • Akshat Godha,
  • Dipankar Banerjee

摘要

We investigate the creep behavior of a model Ti-6 wt.% Al alloy under uniaxial tension from room temperature to 200 °C, representative of the equiaxed α (hcp) phase commonly present in engineering two-phase titanium alloys. This study is motivated by the observed thermal mitigation of dwell fatigue in titanium alloys across this temperature range. A comprehensive set of tensile and creep experiments spanning a wide range of strain rates reveals distinct mechanical responses. Tensile stress–strain curves exhibit a pronounced yield point and weak serrated flow at 120 and 200 °C. While strain rate sensitivity remains nearly constant with temperature, work hardening displays a two-stage behavior in double logarithmic stress–strain rate plots. Primary creep follows a power-law dependence of strain on time but is characterized by unusual discontinuities in the strain rate. Microstructural observations indicate that deformation during creep occurs via widely spaced, heterogeneous slip bands associated with short range order. Activation volume measurements and temperature jump tests were conducted to elucidate the governing rate-controlling mechanisms, offering insights into the underlying creep kinetics and deformation processes.