THE UPSETTING BEHAVIOR OF SEMISOLID ALUMINUM MATERIAL FABRICATED BY AMECHANICAL STIRRING PROCESS

The fabrication processing of semi-solid material (SSM) of casting all oy has been studied to demonstrate the possibilities of mass productio n with a controlled solid fraction, the SSM being fabricated for vario us solid fractions and pre-heating temperatures of the mould. The beha vior of the semi-solid globular microstructure has been investigated f or various heating and die temperatures for the solid fraction. The in fluence of the reheating time on the globularization of the SSM micros tructure has been determined and the compression behavior of a SSM hav ing a solid fraction of 0.5% has been observed. The relationship betwe en the stress and the strain were also obtained from the compression t esting of the semi-solid materials. The rheological behavior of the se mi-solid with a globular microstructure was investigated as a function of the compression velocity, under isothermal holding conditions. (C) 1997 Elsevier Science S.A.