材料科学
表征(材料科学)
纳米复合材料
腐蚀
化学工程
冶金
复合材料
纳米技术
工程类
作者
Xiaoling Fu,RiQiu Deng,Xiangbin Kong,Gururaj Parande,Jisong Hu,Ping Peng,Ze‐Lin Zhu,Baoping Shi,Gang Wang,Manoj Gupta,Robert O. Ritchie
出处
期刊:Acta Materialia
[Elsevier]
日期:2022-05-01
卷期号:230: 117840-117840
被引量:12
标识
DOI:10.1016/j.actamat.2022.117840
摘要
In this work, the corrosion behavior of Mg-SiO2 nanocomposites, fabricated by powder metallurgy coupled with hybrid microwave sintering and subsequent hot extrusion, was investigated using electrochemical, hydrogen evolution and weight loss measurements. Localized intergranular corrosion behavior was analyzed based on microstructural characteristics, which were characterized by scanning electron microscopy, energy-dispersive x-ray spectroscopy, and high-resolution transmission electron microscopy (HRTEM). In particular, copious numbers of Mg/MgO misfit dislocations were identified at the interface between the matrix Mg and SiO2 nanoparticles; indeed, first principles calculations revealed that the MgO/Mg interfaces were relatively weakly bonded as compared to the close-packed interfacial Mg(0001)//MgO(111) structure. Using geometrical phase analysis of the HRTEM images to determine the lattice strains in the Mg/MgO interfacial area, we conclude that the highly strained and weakly bonded Mg/MgO interfaces act to promote significant localized dissolution and thus play a dominant role in intensifying intergranular corrosion in these nanocomposites.
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