Abstract
The internal stress σ i produced by deforming a Ti-5Al-2.5Sn alloy (0.56 at.% O eq) of 19 μm grain size at 300 K was investigated employing a number of techniques. Two sets of values for σ i were obtained: one was represented by the back-extrapolation method (type I) and the other by the conventional short relaxation time decremental unloading method (type II). The latter yielded higher values than the former and had a temperature dependence greater than that of any of the various moduli of titanium. The fact that σ i determined by the type II methods had a stronger temperature dependence than the moduli suggests that it includes a thermally activated component in addition to the athermal long-range internal stress. Support for this is provided by the observations that the temperature dependence of σ i in titanium determined by the type II methods is sensitively dependent on the interstitial content and that for considerably longer relaxation times or higher test temperatures the values for the decremental unloading method approach those for the back-extrapolation method.
Published Version
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