1987 Volume 73 Issue 6 Pages 723-730
Computer simulation of serrated plastic flow at very low temperatures has been investigated by comparing it with the deformation curves of Fe-Ni binary alloys obtained in some coolants such as liquid helium.Simulation was carried out by dividing a specimen into small elements and calculating repeatedly some equations concerning the amount of deformation and the temperature change of each element during a short period of time.The equations were derived basically from the thermally activated dislocation motion and from the heat balance among heats converted from mechanical work, conducted in a specimen and exchanged with the coolant.It was concluded that the behavior of the serration and the accompanied phenomena could be reproduced fairly well by the simulation which did not have unreasonable assumption, whereas details of dislocation motion at cryogenic temperatures has not been clarified.The effects of some factors on the serration were discussed by using the simulation.
