Prof. Chonghe Li Profile

Prof. Chonghe Li

at Shanghai Univ

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Publications (2)

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Proceedings Article | 24 October 2017 Paper

Fabricating micro-nano structures on stainless steel surface by picosecond laser

Zhiwei Xie, Shiyun Dong, Shixing Yan, Jiawu He, Bin Wang, Chonghe Li

Proceedings Volume 10457, 1045718 (2017) https://doi.org/10.1117/12.2283521

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This paper is mainly about the micro-nano structure on stainless steel surface was fabricated by picosecond laser under the static experimental condition, and the surface morphology after ablation is observed and measured by laser scanning confocal microscope (LSCM) and scanning electron microscope(SEM). The technological disciplinarian of stainless steel ablation with different laser parameters, such as power percentage and processing times, was studied. The results show that the change of average power has a main influence on the energy density of laser pulse. With the increase of average power, the energy density of single pulse raises linearly, and the ablation rate increases exponentially. At the same time, the width and depth of micro-nano structures rises with the increase of average power, and the multiscale structure improves gradually. And change the number of processing mainly affects the laser pulse number, the pulse numbers increase linearly with the improve of the processing times. When processing times increase gradually, the width of the micro-nano structures remains the same and then increases and eventually keeps it steady; the depth raises firstly, then decreases, and continues growing finally, while the ablation rate decreases with the power function.

Proceedings Article | 21 October 2009 Paper

Preparation of single crystal of TiNi alloy and its shape memory performance

Chonghe Li, Ziming Guo, Ming Zhu, Xionggang Lu, Xiaosu Ye, Panxin Zhang, Qijie Zhai

Proceedings Volume 7493, 74931L (2009) https://doi.org/10.1117/12.839448

KEYWORDS: Crystals, Crystallography, Solids, Shape memory alloys, Scanning electron microscopy, Heat treatments, Dendrites, Nickel, Annealing, Metals

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The unidirectional solidification equipment based on Bridgman method with high temperature gradient was designed, and the single crystal of Ti-50.0at%Ni alloy was successfully fabricated by this equipment as well as a selective growing zigzag-shaped crystallizer and a steady growth container that were made of electro graphite. The microstructure of single crystal sample was studied by means of Optical Microscopy (OM), Scanning Electron Microscopy (SEM) and Energy Dispersive Spectrometer (EDS); the orientation of single crystal was measured by X-ray technology; the phase transformation points were determined by Differential Scanning Calorimetry (DSC). It is resulted that, the single crystal of TiNi shape memory alloy (SMA) can be prepared with a set of suitable process parameters; the microstructure of the single crystal obtained in this study is dendritic, there is Ti₂Ni intermetallic between the dendrites, the angle between the orientation of single crystal and [111] plane is about 15 degree; the shape memory performances are improved obviously and the maximum recoverable strain reaches 10%.

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