A modified Zerilli–Armstrong model for alloy IC10 over a wide range of temperatures and strain rates

IC10 is a newly developed Ni3Al-based superalloy. To investigate its flow behaviors, tensile experiments were conducted over a wide range of temperatures (293–1073 K) and strain rates (10−5–10−2 s−1) on Material Test System. Experiments show that: (1) flow behaviors are not sensitive to strain rates at room temperature; (2) flow behaviors varies slightly with the temperature at the same strain rate. Z–A model, one of the most widely used models, is employed in describing the flow behaviors of IC10. Normally, the parameters in Z–A model are regarded as constants at various conditions and whole deforming process, which do not agree with the actual process and will decrease its predicted accuracies. In order to improve the predicted accuracies, Z–A model is modified by adding the functions to consider the effects of temperature, strain rate and deforming process on certain parameter. The modified model is used to predict flow behaviors of IC10 at different experiment conditions. Compared with the predicted data of original Z–A model and the experimental data, it is found that the predicted accuracy of the modified Z–A model is improved obviously. The max average relative error decreased from 6.37% to 3.86%.