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In this paper, the plastic deformation behavior and strain homogeneity of the ZK60 Mg alloy during the multi-pass cyclic extrusion and compression (CEC) was simulated using the finite-element method (FEM) with a view to provide an insight into the mechanics of the process. Physical modeling (PM) experiment with same alloy was carried out to verify the results of the numerical simulations. The results show that two vortex flow regions with opposite flow direction are formed inside the cylindrical workpiece during CEC deformation. Although the deformation is inhomogeneous in both end regions of workpiece, a uniform region of equivalent strain exists, and the extent of uniform deformation increased with the increase in workpiece length. [ABSTRACT FROM AUTHOR]

Reports on observations pertaining to the strain rate dependence of cyclic stress response and evolving deformation substructure of K40S cobalt-base superalloy at 900 degrees Centigrade. Typical microstructure of K40S alloy; Explanation of the cyclic stress response behavior; Interfacial dislocations resulting from a stress due to secondary carbide M23C6 volume change.