Effect of rolling deformation on microstructure and mechanical properties of Mg–Y–Nd–Al alloy

Abstract

In this paper, a low-cost and high-performance Mg–4Y–3Nd–1.5Al rolled magnesium rare earth alloy sheet was developed by a multi-pass rolling process. The effect of cumulative rolling deformation on the microstructure and mechanical properties of the alloy sheet was studied. It is found that with the increase of rolling passes, the proportion of dynamic recrystallisation grains increases, the grains are refined and the texture strength is weakened due to the combined effect of particle excitation nucleation mechanism and grain-boundary-induced nucleation mechanism. The results show that fine-grain strengthening and work hardening are the main reasons for the high strength of the alloy sheet. This experiment provides scientific guidance for developing fine-grained magnesium alloy sheets.

Microstructure and Texture Evolution of Hot-Rolled Mg-3Gd Alloy during Recrystallization

“…It is well known that shear bands [8], twin boundaries [9], and particles [10] are the preferential recrystallization nucleation sites for enhancing the formation of a weak recrystallization texture in Mg-RE alloys [11,12]. Meanwhile, the recrystallization behavior of Mg alloys is also highly dependent on the degree of strain [13,14]. In particular, the activation of tension twins (TTWs) and basal ships is much easier than that of compression twins (CTWs), double twins (DTWs), and non-basal slips during the early stage of plastic deformation [15][16][17].…”