A novel temperature dependent yield strength model for metals considering precipitation strengthening and strain rate

In this work, we proposed a novel temperature dependent yield strength model for metallic materials which has no fitting parameters. The temperature dependent yield strength at arbitrary temperatures can be predicted. And a critical yield energy density with material yield is introduced, which comprises the distortional strain energy, potential energy and kinetic energy of atomic motion. A kind of quantitative relationship between the yield strength, temperature, elastic modulus and Poisson's ratio is presented. The agreement between theory and experiment is of good satisfaction. Moreover, a temperature dependent yield strength model considering the precipitation strengthening is introduced to predict the yield stress of precipitation strengthened superalloy. Based on the proposed temperature dependent model, a new temperature and strain rate dependent yield strength is established. The good agreement between theory and experiment is found at the temperatures and strain rates considered. (C) 2016 Elsevier B.V. All rights reserved.