Extensive compression experiments were conducted to measure yield stress under different strain rates

deformation temperatures and holding times. In this study

non-dendritic LC4 alloy fabricated by SIMA method was used. This paper presents results of yield stress measurements in a constant strain rate. Yield stress value decreases slightly with increasing of temperature in solid state

whereas yield stress value decreases dramatically with increasing of temperature in semi - solid state. A sharp drop in yield stress was found to occur at eutectic point. Grain size

spheroidization

cohesion between solid grains and entrapped liquid inside grains are different with increasing of holding time

these result in a decrease of yield stress. This paper also presents results of yield stress measurements in a constant temperature and holding time. Yield stress value increases dramatically with increasing of strain rate. In addition

microstructure evolution of different temperatures and holding times are analyzed. Inherent relationship between yield stress and microstructure is clarified.