Steady-state creep behaviour of Ti3Al-base intermetallics |
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Authors: | M G Mendiratta H A Lipsitt |
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Affiliation: | (1) Systems Research Laboratories Inc., 2800 Indian Ripple Road, 45440 Dayton, Ohio, USA;(2) Air Force Wright Aeronautical Laboratories Materials Laboratory, Wright-Patterson Air Force Base, 45433, Ohio, USA |
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Abstract: | The steady-state creep behaviour of Ti3Al and Ti3Al+10 wt% Nb was studied in the temperature range 550 to 825° C and in the stress range 69 to 312 MN m–2. The temperature and stress dependences of the steady-state creep rates were determined for both intermetallics, and the activation energy and stress-exponent were measured. At temperatures above 700° C, the stress dependence of the steady-state creep rate indicated two distinct creep regimes: at stresses above 138 MN m–2, the creep was controlled most probably by dislocation climb; at stresses below 138 MN m–2, a transition regime with a lower stress-exponent value was obtained. |
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