Dynamic precipitation and dynamic recrystallization during hot deformation of a solutionized WE43 magnesium alloy

A solutionized wrought WE43 magnesium alloy was deformed through compression tests at a wide temperature range of 225-525 degrees C to study the possible interplay of dynamic recrystallization and precipitation. Deformation behavior of the experimental alloy as well as the microstructural evolutions at different temperatures were investigated. The results implied that limited workability of the experimental alloy at low temperatures may be, partly, ascribed to the segregation of Zr atoms and formation of Zr-rich precipitates. Dynamic recrystallization was occurred at 375 and 525 degrees C as the dominant microstructural mechanism. While, dynamic precipitation of beta phase was prevalent at 450 degrees C, resulting in a flow softening in stress-strain curve. The interplay of dynamic precipitation and recrystallization at 450 degrees C was discussed. A time-temperature-transformation diagram was proposed for the occurrence of dynamic precipitation and recrystallization during deformation. The dynamic recrystallization mechanism was recognized to be bulging of prior grain boundaries at 345 and 525 degrees C, while it was replaced by continuous recrystallization and particle stimulated nucleation at 450 degrees C.