The effect of strain rate on macroscopic behavior in the compression forming of semi-solid aluminum alloy

The behavior of alloys in the semi-solid state depends strongly on the impo sed stress state and the morphology of the phase, which can vary from dendr itic to globular. For the optimal net shape forging of semi-solid materials (SSM), it is important to have knowledge of the material behavior with var iation of strain rate. Therefore, to investigate the effect of the compress ion velocity of the deformation of aluminum alloy with a globular microstru cture, the compression test for semi-solid aluminum alloy with a controlled solid fraction is performed by material test system provided with a furnac e. The behavior of the semi-solid aluminum alloy is discussed for various s olid fractions and die speeds. The material constants in the stress-strain relationship are also proposed. (C) 1999 Elsevier Science S.A. All rights r eserved.