The modification effect of Er on hypoeutectic Al-8Si alloy was investigated by KH-2200 optical microscope, JXA-8800R electron probe microanalysis (EPMA) and CMT5105 electromechanical universal testing machine. The res...The modification effect of Er on hypoeutectic Al-8Si alloy was investigated by KH-2200 optical microscope, JXA-8800R electron probe microanalysis (EPMA) and CMT5105 electromechanical universal testing machine. The results show that the eutectic silicon is modified from a coarse flake-like to refined plate-like structure and the tensile properties are improved. With the additional level of Er up to 0.5%, the tensile strength of the Al-8Si alloy is increased by 24%. The Al-8Si-0.5Er alloy has a ductile fractured surface, while the unmodified Al-8Si alloy possesses a brittle fractured surface.展开更多
The transmission electron microscope(TEM)is now one of the most powerful tools for structural characterization due to its high spatial resolution,especially with the advent of the spherical aberration corrector.The in...The transmission electron microscope(TEM)is now one of the most powerful tools for structural characterization due to its high spatial resolution,especially with the advent of the spherical aberration corrector.The interaction between electrons and specimens allows tailoring surface structures by electron irradiation.Furthermore,along with the development of special holders and specimen preparation techniques,the structural evolution of surfaces/interfaces can be dynamically monitored under external fields or reaction environments at the nanoscale,which promotes not only the establishment of the relationship between atomic structures and novel properties,but also potential applications in nanodevices.In this report,we review some of our recent results obtained by TEM,including dynamical observation of surface-mediated novel phenomena,controllable fabrication of nanostructures,and some potential applications in nanodevices.展开更多
文摘The modification effect of Er on hypoeutectic Al-8Si alloy was investigated by KH-2200 optical microscope, JXA-8800R electron probe microanalysis (EPMA) and CMT5105 electromechanical universal testing machine. The results show that the eutectic silicon is modified from a coarse flake-like to refined plate-like structure and the tensile properties are improved. With the additional level of Er up to 0.5%, the tensile strength of the Al-8Si alloy is increased by 24%. The Al-8Si-0.5Er alloy has a ductile fractured surface, while the unmodified Al-8Si alloy possesses a brittle fractured surface.
基金supported by the National Natural Science Fund for Distinguished Young Scholar(Grant No.11525415)the National Natural Science Foundation of China(Grant Nos.51420105003,61274114,11327901,61601116&11674052)
文摘The transmission electron microscope(TEM)is now one of the most powerful tools for structural characterization due to its high spatial resolution,especially with the advent of the spherical aberration corrector.The interaction between electrons and specimens allows tailoring surface structures by electron irradiation.Furthermore,along with the development of special holders and specimen preparation techniques,the structural evolution of surfaces/interfaces can be dynamically monitored under external fields or reaction environments at the nanoscale,which promotes not only the establishment of the relationship between atomic structures and novel properties,but also potential applications in nanodevices.In this report,we review some of our recent results obtained by TEM,including dynamical observation of surface-mediated novel phenomena,controllable fabrication of nanostructures,and some potential applications in nanodevices.
