Papers by Keyword: Nanocrystallisation

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Authors: Heyun Zhao, Xing Hui Wu, Qing Ju Liu, Jin Zhong Xiang, Zuo Quan Liu
Authors: J.H. Paik, Walter José Botta Filho, Alain Reza Yavari
Authors: K.R. Cardoso, Asuncion Garcia Escorial, M. Lieblich, Alain Reza Yavari, Walter José Botta Filho
Authors: G.V. Kalinnikov, R.A. Andrievski, V.K. Egorov
Abstract: Combined amorphous and nanocrystalline films attract an attention due to possibility to improve toughness, wear resistance and other properties which are important in nanomaterials and processes in energy systems. One of the known film fabrication methods is the magnetron sputtering deposition in the presence of an additional external magnetic field with inductions of up to 0.3 T as it was demonstrated by an example of the B4C-TiB2 system. The induction effects on the amorphous films hardness, growth rate and nanocrystallization process were investigated and discussed. The deposition under an additional external magnetic field with induction more than 0.2 T leads to the of nc-inclusions formation as was determined by X-ray diffraction, microdiffraction and high resolution transmission electron microscopy methods. The target and film compositions were determined by energy disperse spectroscopy and Rutherford backscattering spectroscopy. Compared to the target composition, some enrichment by nonmetallic elements (carbon and boron) was fixed in films.
Authors: Yoshiki Yamazaki, Yoshihiro Takahashi, Rie Ihara, Takumi Fujiwara
Abstract: We prepared glasses in 30BaO-(15+x)TiO2-(55–x)GeO2 composition (x=0, 10, 20, 35) and examined their crystallization behavior. Relation of crystallizing-phase to optical transparency in the resulting crystallized sample was also considered. Although the glass samples with x=0-20, which precipitate fresnoite-type Ba2TiGe2O8 as main phase, lost transparency after crystallization, the glass with x=30, which precipitates BaTi4O9 phase, kept good transparency. Dependence of transparency on the x is also discussed.
Authors: Minoru Umemoto, Yoshikazu Todaka, Tadashi Yasuda, Koichi Tsuchiya
Authors: J.S. Blázquez, H. Dimitrov, Jerzy Latuch, Tadeusz Kulik
Authors: Nancy Boucharat, Rainer J. Hebert, Harald Rösner, Gerhard Wilde
Abstract: Deformation-induced nanocrystallization has been investigated in a marginally Al88Y7Fe5 glass forming alloy. Conventional calorimetry and microstructural analyses of materials that have been subjected to high pressure torsion straining (HPT) at room temperature indicate the development of an extremely high number density of small Al nanocrystals. The nanocrystals appear to be distributed homogeneously throughout the sample without any evidence of strong coarsening. Moreover, the comparison between nanocrystallization caused by the application of either HPT, cold-rolling or in-situ TEM tensile straining yielded the identification of the probable mechanisms underlying the formation of nanocrystals. These results form the basis for the development of advanced processing strategies for producing new nanostructures with high nanocrystal number densities which allow increased stability and improved performance.
Authors: Yasuhiko Benino, Takumi Fujiwara, Takayuki Komatsu
Abstract: New crystallized glasses with nonlinear optical properties are developed by various thermal processes for glassy materials which involve the precisely controlled heat-treatment and the novel crystallization patterning using laser spot heating technique. The nonlinear optical functions and their applications are discussed based on the morphologies of the precipitated crystalline phases. The enhancement of the nonlinear optical properties can be expected by introduction of internal stress during the thermal process.
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