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Interface analysis of 7B52 Al alloy laminated composite fabricated by hot-roll bonding

Transactions of Nonferrous Metals Society of China 2016年第5期26卷 1269-1275页

作者：周古昕郎玉婧郝洁刘稳王生乔丽陈敏中国兵器科学研究院宁波分院宁波315103

The bonding interface of 7B52 Al alloy laminated composite （ALC） fabricated by hot rolling was investigated using optical microscopy （OM）, transmission electron microscopy （TEM）, scanning electron microscopy （SEM）, ultrasonic flaw detection （UFD）, and bonding strength tests. The results show that metallurgical bonding is achieved at the interface after composite rolling. The TEM analysis and tensile tests indicate that the 7B52 ALC plate combines high strength of the hard individual layer and good toughness of the soft individual layer. However, UFD technology and SEM analysis prove that the defects （thick oxide films, acid washed residues, air, oil and coarse particles） existing in the bonding interface are harmful to the bonding strength. To sum up, the composite roiling process is suitable for 7B52 ALC plate, and the content and size of the defects should be controlled strictly. Advanced surface treatment of each individual layer would be beneficial to further improve the bonding quality.

关键词： 7B52 alurninium alloy laminated composite hot-roll bonding microstructure interfacial analysis

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Interface analysis in Studying Biomedical Effects of Metal Nanomaterials

Interface Analysis in Studying Biomedical Effects of Metal N...

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中国毒理学会第九次全国毒理学大会

作者： WANG Li-ming CHEN Chun-ying Institute of High Energy Physics Chinese Academy of Sciences National Center for Nanoscience and Technology

The structures and behaviors of nanomaterials atnano-bio interfaces are the basis of biomedical effects of nanomaterials. It is crucial to reveal the interfacial behaviors of metal nanoparticles when they interact with cells, however, highly sensitive and in situ analytical techniques are crucial and required. To understandthe mechanism of biomedical effects from interfacial aspects, we systematically developed analytical methods replying on synchrotron radiation and quantify both interfacial structures and nanomaterials. These techniques can capture both their location and chemical changessuch as adsorption of biomolecules, chemical transformation, catalysis, and redox by synchrotron radiation techniques. For example, spectroscopic techniques are used to characterize the binding structure of hard protein corona on nanomaterials, which shows how corona mediates cytotoxicity. X-ray liquid scattering can as well reveal the binding structures of nano-lipid interfaces to study the interaction between nanomaterials and biological membrane. Moreover, X-rayhigh resolution imaging is employed to capturethe accumulation and location of intracellular metal nanomaterials companying with their chemical form. Finally,we develop methods to characterize metal nanomaterial-involved catalysis and degradation in biological systems and show the determinant for the cytotoxicity from the free radicals or the products after chemical transformation. In conclusion, these methods provide accurate information for chemical forms, structures, and element imaging with promises in nanotoxicology and nanomedicine.

关键词： Biomedical effects of nanomaterials synchrotron radiation metal nanomaterials nanosafety interfacial analysis

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