Microstructure, texture and mechanical properties of Y2O3p/ZG21 composites after rolling and subsequent annealing

The Y2O3p/ZG21 composites were subjected to a multi-cross rolling and subsequent annealing and the microstructure, texture and mechanical properties were investigated. The main phase in composites was (W+ Y2O3p) phase but the grain size changed little after trace addition of Y2O3 micro-particles in ZG21 alloy. After rolling, the deformed microstructure with lots of twins and shear bands and a basal texture with double peaks were obtained. The yield strength showed a strong isotropy along rolling direction (RD) and transverse direction (TD). However, after annealing, the deformed microstructure and basal texture were replaced by the recrystallized microstructure and a circle multi-peaks texture. Compared with the rolling states, the yield strength was anisotropic along RD and TD. The anisotropic properties were attributed to the asynchronous change of R-texture component and T-texture component during annealing. The k values of Hall-Petch relationship along RD and TD were also different due to different deformation mechanisms. What's more, the annealed Y2O3p/ZG21 composites still showed superior ductility. (C) 2021 Published by Elsevier B.V.

Automated summary

The Y2O3p/ZG21 composites underwent significant changes in microstructure and mechanical properties after rolling and annealing processes. Deformed microstructure with twins and shear bands, as well as a basal texture with double peaks, were observed after rolling; while a recrystallized microstructure and circle multi-peaks texture were obtained after annealing. The anisotropic yield strength and superior ductility of the composites were attributed to the asynchronous change of texture components during annealing and different deformation mechanisms.