Abstract
The creep behavior of a dispersion strengthened tungsten alloy was studied over a temperature range of 1820 to 2160 K or 0.45 to 0.56 Tm and a stress range of 24 to 138 MPa. The activation energy for creepwas determined as 2.37 ± 0.07 MJ/kgK and was not a function of stress. The steady-state creep rate varied linearly with stress at stresses below 80 MPa and as the 4.6 ± 0.1 power of stress at stresses above 100 MPa. The stress dependency did not satisfy an exponential relationship. The creep behavior satisfied the functional dependency of the Ansell-Weertman model, but the creep rates were in error by a factor of about 103. Nabarro-Herring creep in the low-stress region and a modification of the Ansell-Weertman theory in the high-stress region provide satisfactory agreement with experiment for this tungsten alloy as well as the SAP alloy of Ansell and Lenel.
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Blickensderfer, R. Creep behavior of a tungsten alloy dispersion strengthened by ZrO2. Metall Trans 5, 2347–2350 (1974). https://doi.org/10.1007/BF02644015
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DOI: https://doi.org/10.1007/BF02644015