Researchers have determined hardnes

Researchers have determined hardness for the magnesium alloyin HV Vickers micro hardness. Most of the researchers observed thehardness to be improved through number of ECAP passes andannealing [28,29] while for some of the researchers it showedthe decreased in total hardness [25,17,18] due to the different processing conditions and microstructure stability. The hardness ofmagnesium alloy improved by heat treatment, aging temperatures[34].Most of the researchers have investigated the mechanical properties of magnesium alloy, it is observed that young’s modulus,yield stress, ultimate tensile stress were higher after ECAP andHPT with additional annealing and cooling in water than in air[26,20,25,27,1] and increased in ductility is found due to twinningreinforcement of slip on basal plane. Shear band in tensile, whichshowed good ductility [1]; the particle size effects the tensilestrength, the tensile strength can be improved by thermal treatment [26,20] or extrusion [22].The mechanism and mode of failure during tensile testing ofmagnesium alloy has been reported by [31] he observed that theinitiation and growth of shear cracks leading to the grain size toenlarge and moves one away from the crack leads to failure ofthe material matrix. [9] observed the failure for the tensile testingof magnesium alloy occurs by ductility failure, and dimples variations leads to microstructure failure. [26,20] observed the failurefor AZ91 alloy due to the brittle fracture, micro pores, while forAZ61 alloy is due to ductile fracture.Compressive strength was found to be increased for magnesiumalloy after hardening treatment at below 200 C and fell belowbeyond 200 C [5]. The compressive strength can be improved bytwining mechanism with ECAP passes [30].The researchers found increase in texture after two ECAP passesat 150 C, as the old texture was replaced by the newly formedstrong texture having basal slips [33]; while the other researchersfor texture found that the material after ECAP passes through routeBc, C showed high basal slips [21,12].The toughness for magnesium alloy is increased as the materialprocessed by ECAP passes, as the grain size decrease and increasein toughness is observed leading to increase in Charpy impacttoughness [30] and [35].