Abstract
Grain refinement in as-cast AZ80 magnesium alloy under large strain deformation was studied by hot multiple forging (MF). The results show that during the deformation there exists a critical strain controlling the degree of the homogeneity, which is in the range of 2–2.4. A homogeneous microstructure with fine dynamic recrystallized grains can be attained when the applied strain exceeds the critical strain and after that, it is difficult to get more grain refinement further. A main characteristic of microstructure evolution is directly associated with grain splitting due to the formation of microbands that develop in various directions. Such microbands intersect each other during hot MF, resulting in continuous subdivision of coarse grains into misoriented fine domains. Further deformation leads to increase in the number and misorientation of these boundaries and finally almost full development of fine equiaxed grains in high strain. New grains are concluded to be evolved by a kind of continuous reaction, that is essentially similar to continuous dynamic recrystallization.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.