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The Refinement Effect of Alumina–Silica Sol‐Coated ZnO Particles for Cast Magnesium
Advanced Engineering Materials ( IF 3.4 ) Pub Date : 2020-06-16 , DOI: 10.1002/adem.202000329 Rui Cao 1 , Meng Meng 1
Advanced Engineering Materials ( IF 3.4 ) Pub Date : 2020-06-16 , DOI: 10.1002/adem.202000329 Rui Cao 1 , Meng Meng 1
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Based on edge‐to‐edge matching crystallographic model, ZnO is identified as an effective grain refiner for magnesium. However, the reduction of ZnO particles by molten Mg destroys the crystal structure and restricts its refinement efficiency. Herein, alumina/silica sol–gel coatings are prepared on the surface of micrometer‐sized ZnO, forming a ZnO core sol‐coating shell structure to improve the thermal stability of the ZnO. Experimental observations indicate that the refining effect of ZnO is significantly enhanced by the presence of alumina‐silica sol (ASS) coatings and the core‐shell structure. The addition of 1.5 wt% ASS‐coated ZnO particles to Mg reduced the grain size from ≈3200 to 65 μm. The grain size of the Mg‐3wt%Al‐1 wt%‐Zn alloy (AZ31) can also be refined from 145 to 82 μm. Scanning electron microscopy and X‐ray powder diffraction reveals that the sol coating partly maintain the crystal structure of ZnO. More unreduced ZnO and related solid redox products are reproducibly observed within the refined Mg grains, which promote heterogeneous nucleation of Mg. Zn, and Al solute produced by relative reduction and unreduced ZnO on grain boundaries also contribute to refinement. In addition, the ASS coating also increase the refining efficiency of ZnO for Mg and AZ31 at various cooling rates.
中文翻译：
氧化铝-二氧化硅溶胶包覆的ZnO颗粒对铸镁的细化作用
基于边对边匹配晶体学模型，ZnO被确定为镁的有效晶粒细化剂。然而，熔融的Mg还原ZnO颗粒会破坏晶体结构并限制其细化效率。在此，在微米级的ZnO表面上制备了氧化铝/二氧化硅溶胶-凝胶涂层，形成了ZnO核心溶胶涂层壳结构，以提高ZnO的热稳定性。实验观察表明，氧化铝-二氧化硅溶胶（ASS）涂层和核-壳结构的存在显着增强了ZnO的提纯效果。在Mg中添加1.5 wt％的ASS包覆的ZnO颗粒可将晶粒尺寸从3200微米减小到65微米。Mg-3wt％Al-1wt％-Zn合金（AZ31）的晶粒尺寸也可以从145微米细化到82微米。扫描电子显微镜和X射线粉末衍射表明，溶胶涂层部分保留了ZnO的晶体结构。在精炼的镁晶粒内可再现地观察到更多未还原的ZnO和相关的固体氧化还原产物，这会促进镁的异质成核。通过相对还原和在晶界上未还原的ZnO生成的Zn和Al溶质也有助于细化。此外，ASS涂层还提高了在各种冷却速率下ZnO对Mg和AZ31的提纯效率。相对还原和未还原的ZnO在晶界上产生的Al溶质也有助于细化。此外，ASS涂层还提高了在各种冷却速率下ZnO对Mg和AZ31的提纯效率。相对还原和未还原的ZnO在晶界上产生的Al溶质也有助于细化。此外，ASS涂层还提高了在各种冷却速率下ZnO对Mg和AZ31的提纯效率。
更新日期：2020-06-16
中文翻译：
氧化铝-二氧化硅溶胶包覆的ZnO颗粒对铸镁的细化作用
基于边对边匹配晶体学模型，ZnO被确定为镁的有效晶粒细化剂。然而，熔融的Mg还原ZnO颗粒会破坏晶体结构并限制其细化效率。在此，在微米级的ZnO表面上制备了氧化铝/二氧化硅溶胶-凝胶涂层，形成了ZnO核心溶胶涂层壳结构，以提高ZnO的热稳定性。实验观察表明，氧化铝-二氧化硅溶胶（ASS）涂层和核-壳结构的存在显着增强了ZnO的提纯效果。在Mg中添加1.5 wt％的ASS包覆的ZnO颗粒可将晶粒尺寸从3200微米减小到65微米。Mg-3wt％Al-1wt％-Zn合金（AZ31）的晶粒尺寸也可以从145微米细化到82微米。扫描电子显微镜和X射线粉末衍射表明，溶胶涂层部分保留了ZnO的晶体结构。在精炼的镁晶粒内可再现地观察到更多未还原的ZnO和相关的固体氧化还原产物，这会促进镁的异质成核。通过相对还原和在晶界上未还原的ZnO生成的Zn和Al溶质也有助于细化。此外，ASS涂层还提高了在各种冷却速率下ZnO对Mg和AZ31的提纯效率。相对还原和未还原的ZnO在晶界上产生的Al溶质也有助于细化。此外，ASS涂层还提高了在各种冷却速率下ZnO对Mg和AZ31的提纯效率。相对还原和未还原的ZnO在晶界上产生的Al溶质也有助于细化。此外，ASS涂层还提高了在各种冷却速率下ZnO对Mg和AZ31的提纯效率。
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