Microstructural and mechanical properties of magnesium alloy processed by severe plastic deformation (SPD) - A review

A review on Mechanical properties of ultra-fined grained (UFG) Magnesium based alloy using SPD process is presented in this paper. The properties discussed comprise of microstructural, optical, physical and mechanical behaviour of Ultra- fined grained magnesium alloy and effects of grain size, heat treatment, Extrusion and Annealing, quenching, Normalizing process on these properties. The outcome obtained by many Researchers showed that Magnesium alloy processed by Severe Plastic Deformation (SPD) showed a way to improve the mechanical properties, by refining the grains. The Dislocation density, Hardness, Compressive, Tensile and texture were observed to be increased up to certain limit after that loss of microstructure stability, decrease of micro hardness and decrease in dislocation density were observed. The Mechanical properties are well improved by Extrusion, Annealing, ECAP, ARB and HPT processes. Mechanism of Grain growth, Activation energies for grain growth, stress corrosion rate and Thermal stability were observed by previous Researchers during Fractography analysis on several specimens of Ultra-fined grained Magnesium alloy. (C) 2019 Elsevier Ltd. All rights reserved.