Yield Strength Anomaly
Lambert M. SurhoneISBN: 978-6-1320-0122-1;
In materials science, the yield strength anomaly refers to the phenomenon that the yield strength (i.e., the stress necessary to initiate plastic deformation) increases with temperature. For the vast majority of materials the opposite is the case, that is, the yield strength decreases with increasing temperature. This phenomenon is often, however incorrectly, referred to as the yield stress anomaly. Precipitation hardening superalloys exhibit yield strength anomaly over a considerable temperature range. After reaching a local maximum, usually at about 80% of the melting temperature, the yield strength eventually drops to zero when reaching the melting temperature, where the solid material transforms into a fluid. The yield strength anomaly is exhausted in the design of gas turbines and jet engines that operate at high temperatures, where the materials used are selected based on their paramount yield and creep resistance.
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