Abstract:The effect of deformation degree on deformation microstructure in the preparation of semi-solid AZ91D alloy billet by Strain Induced Melt Activated (SIMA) process was studied and the relationship between deformation degree and eutectic melting activation energy was studied by Differential Scanning Calorimetry (DSC). The results showed that with an increase in deformation degree, the original microstructure of the alloy changed from dendrites to fragmentary grains where there were twins and dislocations. When the deformation degree was 40%, the decreased amount of eutectic melting activation energy was not significant. Melting point of eutectic decreased slightly with increasing deformation degree.
The rheological properties of an electrorheological(ER) fluid have been studied in a modified concentric cylinder viscometer. The results show that the relation of shear rate and shear stress is non-linear at certain shear rate defined as an original transition zone. Regressive analysis reveals that the ER fluid is of yield-pseudoplastic fluid in the transition zone. With increase in applied fields, the rheological properties of the ER fluid deviates from Newtonian fluid and the length of the transition zone becomes longer.
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