A review on Mechanical properties o

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, physicaland 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 outcomeobtained 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 afterthat loss of microstructure stability, decrease of micro hardness and decrease in dislocation density wereobserved. 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 andThermal stability were observed by previous Researchers during Fractography analysis on several specimens of Ultra-fined grained Magnesium alloy. 1. IntroductionMagnesium and its alloys play an important role in the moderngeneration, as they are good against Mechanical properties. Theyare light-weight materials, they possess an extensive applicationsto replace some conventional structural materials in many industrial branches, e.g. in Automotive, space aircraft and can be usedin Biodegradable implant applications. Magnesium alloy are oflow in density of (
1.7 g/cm3), and has a high specific strength,defined by ratio of high strength to density. The yield stress ofmagnesium alloy is lower than the aluminium alloys, manyresearchers have been trying to improve the properties and makeutilise for use in many applications. Magnesium alloy are shownto be completely dissolvable with in human body, which assuresto be used in Biodegradable implants as having high strength tocommon polymers. (Figs. 1–25).The strength of the magnesium alloy are well improved by SPDprocess, thus refining the grain size and improving properties.Many techniques have been employed for generation of ultrafine grained (UFG) materials e.g. Equal Channel angular Pressing(ECAP), High pressure Torsion (HPT), accumulative roll-bonding(ARB) etc.The overall strength of Magnesium alloy depends upon thecomposition, grain size, microstructural and the way of fabricationprocess done. The main objective of this paper is to review the different methods of fabrication process on grain particle distribution,grain size, heat treatment done by extrusion and annealing processand there effects on improving their mechanical properties of magnesium alloy, as experienced by the previous researchers.