Ultrafine-grained Mg–3Al–1Zn alloys

What is it about?

It is about the effect of Ag additions on dynamic recrystallization, texture, and mechanical properties of ultrafine-grained Mg–3Al–1Zn alloys. The results suggest that Ag segregation and Al–Zn–Ag clusters form in the Mg matrix. The resulting grain size decreases from 513 to 316 nm. As the Ag addition increases to 2 wt%, the Mg54Ag17 phase precipitates along the grain boundary, which plays an important role in restricting DRXed grain growth via grain boundary pinning effect. The extrusion texture of the investigated alloys is in fairly scattered orientation distribution. The weak basal texture and ultrafine grain size lead to the high yield asymmetry ratio. The Ag-containing extruded alloys exhibit an increase in the tensile and compressive properties. The strengthening mechanisms due to grain refinement, dislocations, solid solution, precipitates, solute clusters, and segregation are discussed.

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Why is it important?

On one hand, the Ag-containing extruded alloys exhibit an increase in the tensile and compressive properties. On the other hand, Ag segregation in the microstructure is very intresting and it is important for the following process, aim to the improvement of strength and ductility of Mg alloys.

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