Abstract
Static strain-aging was investigated in commercial purity α-Ti, containing 0.41 at. pct of oxygen as the principal interstitial impurity. 17 μM grain size specimens, prestrained to 0.02 strain at a nominal strain-rate of 3.3×10−4S−1, were agedin situ between 555 and 630 K for lengths of time between 150 and 2.55×105 seconds. Both the upper and lower yield point increments were employed as measures of the aging progress. Under the stated conditions, the static strain-aging response of the titanium appeared to consist of four stages, of which only Stages 1 and 2 were considered in this work. Stage 1 corresponded to a Haasen and Kelly type of yield point, while Stage 2, after correcting for the time-independent yield point increment of Stage 1, conformed to Cotrell aging,i.e., the increase in flow stress after aging followed at 2/3 behavior. The activation energy deduced for the process is in good agreement with that for the diffusion of oxygen in titanium.
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Donoso, J.R., Reed-Hill, R.E. Static strain-aging in commercial purity alpha titanium. Metall Trans A 8, 945–948 (1977). https://doi.org/10.1007/BF02661577
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DOI: https://doi.org/10.1007/BF02661577