Prediction of the flow stress of A16061 at hot deformation conditions

Isothermal compression tests were carried out on A16061 using a Gleeble-1500 thermal simulator at temperatures ranging from 573 to 723 K and strain rates from 0.5 to 30 s(-1). The flow stress of A16061 was characterized based on an analysis of the true stress-true strain curves. A mathematical mode coupling flow stress with strain, strain rate and temperature for A16061 has been proposed by using a hyperbolic sinusoidal type equation. The material constant a is 0.01 MPa-1 n the model, whereas other material constants n, InA and Q are found to be functions of strain. The predicted results from this proposed model are found to be in good agreement with the experimental flow stress curves which can be used to predict the required deformation forces in hot deformation processes. (C) 2011 Elsevier B.V. All rights reserved.