Microstructure and Mechanical Properties of Zamak 3 Alloy Subjected to Sliding Friction Treatment

With aim to enhance the understanding of the relationship between the microstructure and mechanical properties of severe plastic-deformed Zn alloys, this work investigates the microstructural evolution and underlying deformation mechanisms of Zamak 3 alloy subjected to sliding friction treatment (SFT). With an increase in the strain from the matrix to the surface of the SFT Zn alloy, three types of microstructural characteristics are observed: (i) Gradual refinement of the Zn grains, (ii) First increase and then decrease in twin density, and (iii) Gradually elongated/broken eutectic phases. The results of mechanical tests reveal that work hardening plays a dominant role until strong softening resulting from microstructural refinement. The competition between hardening and softening related to the microstructural evolution determines the specific mechanical properties of Zn alloys.