Texture Selection Mechanisms during Recrystallization and Grain Growth of a Magnesium-Erbium-Zinc Alloy
Texture Selection Mechanisms during Recrystallization and Grain Growth of a Magnesium-Erbium-Zinc Alloy
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DOI：
10.3390/met11010171
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发表时间：
2021-01-01
期刊：
影响因子：
2.9
通讯作者：
Al-Samman, Talal
中科院分区：
文献类型：
--
作者：
Mouhib, Fatim-Zahra;Sheng, Fengyang;Al-Samman, Talal
对二元和三元Mg-1%Er/Mg-1%Er-1% zn合金进行轧制，然后进行各种热处理，研究再结晶和晶粒长大过程中的织构选择。结果表明，两种合金的织构都发生了良好的变化，并且在三元合金中形成了独特的+/- 40度横向再结晶织构。二元合金的织构和晶粒尺寸在再结晶和晶粒长大过程中不断发生变化，而三元合金的织构在再结晶早期发生了快速轧制（RD）向横移（TD）方向转变。再结晶部分的定向电子背散射衍射（EBSD）分析揭示了具有TD倾斜取向的再结晶核的选择性生长行为，这可能归因于溶质阻力对特定晶界迁移率的影响。Mg-1%Er-1%Zn在晶粒生长退火过程中表现出惊人的组织稳定性。这是由于致密的纳米颗粒在基体中分散，通过齐纳阻力阻碍了晶粒的生长。在5%拉伸应变下，通过单轴拉伸试验结合EBSD辅助滑移痕迹分析来确定两种合金的力学性能，以研究非基底滑移行为。与Mg-1%Er合金相比，Mg-1%Er-1% zn合金的屈服强度、应变硬化能力和破坏延展性都有显著提高，这是由于合金在固溶强化、滑移活化和沉淀硬化方面的协同作用。
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.