Abstract
Tensile twins (TTs) were induced in AZ31 Mg rolled sheet and then, the pre-twinned sample (C25) was annealed at 200 °C for 6 h (A200) to retain TTs and 450 °C for 2 h (A450) to eliminate TTs to the full extent, respectively, to explore the effect of recrystallization of pre-twinned Mg sheets on microstructure and mechanical properties. Abundant TTs with a volume fraction of 67.9% are induced in C25, and work hardening and grain refinement strengthening result in its highest ultimate tensile strength of 300 MPa, and its lowest elongation ~ 9% indicates that induced TTs contribute little to deformation coordination. Strong rolling direction (RD)-titled texture is mainly responsible for the distinct difference in its yielding strengths along the RD and transvers direction. Static recrystallization occurs both in A200 and A450. A200 shows excellent ductility (~ 18% elongation) owing to a bimodal distribution with weakened RD-titled texture and its smallest average grain size of 8.02 μm. The vast majority of TTs retains and some “isolated” TT laminae detaching from grain boundaries of their parent grains are observed in A200, but TTs are hardly observed in A450 accompanying some thick TT laminae with grain-like morphology. The recrystallized grains inheriting the orientation of TTs and amalgamation and growth of subgrains strengthen the RD-titled texture and cause increase in fraction of high angle grain boundaries, leading to a slight decrease in strength.
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Acknowledgment
This study was supported by National Natural Science Foundation of China under Grant No. 52005362 and No. U1810208; Fundamental Research Program of Shanxi Province under Grant No. 20210302123163; Scientific and Technological Innovation Programs of Higher Education Institutions in Shanxi, China 2019L0149. The authors acknowledge the assistance of Instrumental Analysis Center Taiyuan University of Technology.
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Li, Z., Nie, H., Kong, Q. et al. Recrystallization Behaviors and Mechanical Properties of Pre-twinned Mg Sheet at Varied Annealing Temperatures. J. of Materi Eng and Perform (2023). https://doi.org/10.1007/s11665-023-08936-9
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DOI: https://doi.org/10.1007/s11665-023-08936-9