The recrystallization, texture and mechanical behavior of hot rolled and annealed Mg-10Ho binary alloy

The recrystallization, texture, and mechanical properties of hot-rolled and hot-rolled + annealed Mg-10Ho (wt %) are investigated. Mg-10Ho binary alloy is first solution treated followed by multipass rolling at 420 degrees C for up to 50 % reduction and subsequently annealed at 400 degrees C for different times for up to 60 min. The microstructure of deformed and annealed samples was characterized using a field-emission secondary electron microscope (FESEM) and electron back-scattered diffraction (EBSD) and the mechanical properties were examined using hardness and tensile tests. The as-rolled microstructure contains fine dynamic re-crystallized grains and different types of deformation twins. With increasing annealing time, a decrease in the hardness was observed, suggesting initiation of recovery and static recrystallization. After 10 min of annealing, an equiaxed, nearly fully recrystallized microstructure with a grain size of 14 mu m and weaker basal texture was obtained. This annealed sample exhibits an ultimate tensile strength of 213 MPa, yield strength of 145 MPa, and ductility of similar to 7 %. Such an optimum combination of strength and ductility is attributed to the combined effect of solid solution strengthening, grain refinement, and texture weakening. Additionally, the Johnson-Mehl-Avrami-Kolmogorov (JMAK) model was used to understand the re-crystallization kinetics of Mg-10Ho and compared it with that of Mg-10Y. Results indicate that the solute drag effect plays a dominant role in the faster recrystallization kinetics of Mg-10Ho alloy. Finally, the texture variation in Mg-10Ho and Mg-10Y is also explained based on the solute drag effect.(c) 2023 Elsevier B.V. All rights reserved.

Automated summary

The recrystallization, texture, and mechanical properties of Mg-10Ho binary alloy were investigated. After solution treatment and multipass rolling, the annealing process resulted in equiaxed, fully recrystallized microstructure with weaker basal texture. This annealed sample exhibited optimum combination of strength and ductility due to solid solution strengthening, grain refinement, and texture weakening. The solute drag effect played a dominant role in the faster recrystallization kinetics of Mg-10Ho alloy, and the texture variation was explained based on this effect.