Effect of trace impurities on the creep behavior of a near α titanium alloy

The creep behavior of a near α titanium alloy was evaluated for the α + β and β heat-treatment conditions at two different levels of iron and nickel. Stress exponents varied from 4.6 to 7.9, suggesting that dislocation climb was the rate-controlling mechanism. The alloy containing lower iron plus nickel content exhibited superior creep resistance. The results were rationalized in terms of activation energy in the framework of dislocation creep.