Papers by Keyword: Amorphous

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Authors: Paul J. Warren, M. Thuvander, M. Hourai, H. Lane, Alfred Cerezo, George D.W. Smith
Authors: Wei Qiang Hu, Zong De Liu, Guang Yang, Yong Tian Wang, Hua Lei Zhang
Abstract: A thick Fe-based amorphous and nanocrystalline composite coating was prepared by in-situ tungsten inert gas (TIG) cladding method. The results show that the cladding coating mainly consists of amorphous phase and nanocrystalline grains. The microstructure study shows that the Fe-based composite coatings have unique microstructure including nano-sized grains surrounded by nano-scale amorphous shell layer (encapsulated structure) and the homogeneously distributed dendrites/cellular crystals. The unique microstructure gives rise to the superior micro-hardness and wear resistance of the coating. The Fe-based coatings have great potential as promising wear-resistance structural materials used in electric power and cement industry.
Authors: Wei Cui, Shi Lu Xu, Ping Li, Ting Ma, Yong Hui Yang
Abstract: In this paper, we propose a novel material- amorphous silicon germanium(a-SiGe). The a-SiGe film was formed by PECVD at a low temperature and a low frequency. By adjusting the fraction x of Ge in Si1-xGex, optimal SiGe bandgap was achieved. We used amorphous silicon germanium alloy as MOSFET source/drain. The parameter of MOSFET shows that, as the fraction increases, the drain-to-source breakdown voltage increases. With reduction of the minority carrier inject ratio, the current gain β of parasitic BJT in MOSFET was reduced greatly, which eliminates the limit of the breakdown voltage of the device.
Authors: Weiguang Zhu, Jie Deng, Ooi Kiang Tan, Xiao Feng Chen
Authors: Hai Lin Zhang, Yu Bo Jiang, Xue Lei Tian
Abstract: Structural analysis software for amorphous alloy has been developed. The structure factor, distribution function, the first coordination number, the first coordination radius, the correlation radius, the atomic number of cluster and the atomic average density of amorphous alloy can be gotten with this software. This software’s runtime stability and calculated accuracy was verified by its practical application. Structure of amorphous Zr41Ti14Ni10Cu12.5Be22.5 alloy was exactly analyzed using this software, which proved that the design of the software is precise and the calculation is exact.
Authors: Xi Jie Tian, Yong Zou, Huan Yong Cui
Abstract: The Ni-P-Sn coatings were prepared by electroless plating. Crystallization fouling adhering experiments indicated that these electroless Ni-P-Sn coatings have better anti-fouling property than that of un-coated and Ni-P samples. The surface free energy of Ni-P-Sn deposit increases with the increase of the nanocrystalline phase. It’s considered that the degree of crystallization fouling adhesion is related to the surface free energy of the sample. The amorphous matrix with lower surface free energy can significantly improve the anti-fouling ability in comparison with that of un-coated samples.
Authors: Young Chul Kim, Dae Wook Kim, Ho Seob Kim, Seong Joon Ahn, Seung Joon Ahn
Abstract: We have annealed the thin layer of the amorphous silicon (a-Si) using the Q-swtiched Nd:YAG laser pulses in order to transform the a-Si into polycrystalline silicon (poly-Si) and investigated the crystalline structures of the poly-Si. Before illuminating the light to the layer, the frequency of the laser was doubled through the second harmonic generation (SHG) process to enhance the absorption efficiency of the optical energy. When the optical energy was higher than 500 mJ/cm2, we could obtain the micro-crystalline structure with grain size as large as 500 nm.
Authors: Jian Yu Huang, Yuntian T. Zhu
Authors: Pyuck Pa Choi, Ji Soon Kim, O.T.H. Nguyen, Dae Hwan Kwon, Young Soon Kwon
Abstract: Al-La-Ni-Fe alloys of three different compositions (Al82La10Ni4Fe4, Al85La9Ni3Fe3 and Al88La6Ni3Fe3) were prepared high-energy milling in a planetary ball-mill (AGO-2). Complete amorphization was observed for the Al82La10Ni4Fe4 alloy after milling for 350 h at a rotational speed of 300 rpm. In contrast, the Al85La9Ni3Fe3 and Al88La6Ni3Fe3 powders contained the FCC Al phase even for prolonged milling. The amorphization tendency was found to increase in the order of Al88La6Ni3Fe3 < Al85La9Ni3Fe3 < Al82La10Ni4Fe4, which may well be ascribed to the increasing atomic size mismatch of the constituent elements on La addition. DSC analyses of amorphous samples revealed two-stage crystallization processes for all three alloys, however, with strong variations in the thermal stability upon compositional changes. As observed by SEM, amorphous powders consisted of particles with nearly spherical shape and diameters ranging from 5 to 20 µm.
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