Theoretical research on rheological behavior of semisolid slurry of magnesium alloy AZ91D

Rheological Characterization of Semi-Solid Metals: A Review

“…An enhanced model based on the Herschel-Bulkley equation was proposed also for other metallic alloys, as such as steels [79] and Mg alloys [80]. Pouyafar et al [79] calculated the yield stress of M2 steel from the flow curve obtained from experiments in steady-state flow by interpolation of the experimental results to evaluate the stress at zero shear rate.…”

Microstructure Analysis and Rheological Behavior of Magnesium Alloys at Semi-solid Temperature Range

“…In the source literature, authors took up the subject of dynamic viscosity of magnesium alloys (Ref 23, 48-52); however, their results did not concern the systems with the addition of rare earth elements. What is more, authors usually examined the rheological phenomenon of semi-solid slurries of alloys ( Ref 23,[48][49][50][51][52]. At the same time, the rheological behavior, i.e., thixotropy of the tested AZ91 alloy, was analyzed in a slightly different way, by studying the rest time and subjecting the system to the impact of forces, instead of gradual change of the shear rate (Ref 48, 49).…”

“…The foregoing effects were related to the mechanism of merging and breaking the grain agglomerates, depending on ''force'' ( Ref 2). The literature contains numerous studies on rheological analysis of aluminum and magnesium alloys (Ref , whose authors determined the values of dynamic viscosity coefficient ( Ref 23,[49][50][51][52][53]; however, these data did not concern the systems with the addition of rare earth elements. Many studies (Ref [10][11][12] indicated the positive effect of rare earth elements on microstructure and the mechanical properties of magnesium alloys after casting or plastic deformation.…”

Mathematical Description of Semi-Solid Magnesium Alloys Behaviour by Using Rheological Models

“…The vast majority of models constitute a group of theoretical or semi-empirical equations, where the thermodynamic parameters of solutions, or some parameters determined by experimental methods, are used for calculations regarding the dynamic viscosity coefficient. This paper makes an attempt to verify the existing rheological models (on the basis of experimental data), which in the source literature are most often used to describe rheological parameters of semi-solid alloys of light metals [19][20][21][22][23]. Finding models that most faithfully describe data coming from high-temperature rheological measurements seems key from the point of view of process development in materials engineering.…”