期刊
METALS
卷 11, 期 1, 页码 -出版社
MDPI
DOI: 10.3390/met11010171
关键词
magnesium-rare earth alloy; recrystallization; selective grain growth; texture
资金
- Deutsche Forschungsgemeinschaft (DFG) [AL 1343/7-1]
Binary and ternary Mg-1%Er/Mg-1%Er-1%Zn alloys were studied for texture selection during recrystallization and grain growth. The ternary alloy showed a unique TD recrystallization texture and selective growth behavior attributed to solute drag effect. Mg-1%Er-1%Zn alloy demonstrated remarkable enhancement in mechanical properties due to synergic alloying effects.
Binary and ternary Mg-1%Er/Mg-1%Er-1%Zn alloys were rolled and subsequently subjected to various heat treatments to study texture selection during recrystallization and following grain growth. The results revealed favorable texture alterations in both alloys and the formation of a unique +/- 40 degrees transvers direction (TD) recrystallization texture in the ternary alloy. While the binary alloy underwent a continuous alteration of its texture and grain size throughout recrystallization and grain growth, the ternary alloy showed a rapid rolling (RD) to transvers direction (TD) texture transition occurring during early stages of recrystallization. Targeted electron back scatter diffraction (EBSD) analysis of the recrystallized fraction unraveled a selective growth behavior of recrystallization nuclei with TD tilted orientations that is likely attributed to solute drag effect on the mobility of specific grain boundaries. Mg-1%Er-1%Zn additionally exhibited a stunning microstructural stability during grain growth annealing. This was attributed to a fine dispersion of dense nanosized particles in the matrix that impeded grain growth by Zener drag. The mechanical properties of both alloys were determined by uniaxial tensile tests combined with EBSD assisted slip trace analysis at 5% tensile strain to investigate non-basal slip behavior. Owing to synergic alloying effects on solid solution strengthening and slip activation, as well as precipitation hardening, the ternary Mg-1%Er-1%Zn alloy demonstrated a remarkable enhancement in the yield strength, strain hardening capability, and failure ductility, compared with the Mg-1%Er alloy.
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