**4. Conclusion**

AZ80/91 Mg alloy processed through both die A and die B at 598 K were discussed in this chapter. Indeed, Mg alloy processed through die A has significantly shown fine grains than die B. Since the grain size and distribution of secondary phases are a major factor in determining the strength and corrosion resistance of the material respectively, therefore die A is considered as optimal to achieve fine grain structure in our work. As a result, the fine grains obtained through die A exhibited improved mechanical and corrosion resistance discussed in the earlier sections. Also, based on the experimental results and discussion, the following conclusions were drawn.

• Increase in ECAP passes lead to homogeneous microstructure due to dynamic recrystallization which occurred during ECAP process. The secondary β-Mg17Al12 phase was reduced and uniformly distributed throughout the

*Effect of ECAE Die Angle on Microstructure Mechanical Properties and Corrosion Behavior… DOI: http://dx.doi.org/10.5772/intechopen.94150*

extruded material. Here, the effectiveness of ECAP with die A in grain refining of AZ80/91 Mg alloys was quite significant because of imposing large plastic strain of ~5.06 after four ECAP passes.

