Abstract
In the present study, a Mg–Y dilute alloy was provided for a severe plastic deformation by high pressure torsion (HPT) and subsequent annealing. After the HPT by 5 rotations, nanocrystalline (NC) structures with an average grain size of 240 nm having deformed characteristics were obtained. Subsequent annealing at various temperatures for 2–60 min resulted in fully recrystallized structures with different average grain sizes ranging from 0.66 to 8.13 μm. Good balance of tensile strength and ductility could be realized in the fine grained specimens. For the specimen having a mean grain size of 2.13 μm, the yield strength and total tensile elongation were 180 MPa and 37%, respectively, which were much higher than those of pure Mg with a similar grain size. The significant contribution of Y on the microstructure and mechanical properties is discussed.
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