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C. V. Gokularathnam

Bio: C. V. Gokularathnam is an academic researcher from Indian Institute of Technology Madras. The author has contributed to research in topics: Glass transition & Amorphous metal. The author has an hindex of 1, co-authored 1 publications receiving 17 citations.

Papers
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TL;DR: A review of the studies on the structure of metallic glasses can be found in this paper, where a dense random packing model or modifications thereof can best explain the structure and range of stability of amorphous alloys.
Abstract: Metallic glasses or amorphous alloys have been produced by rapid quenching of alloys from the liquid or vapour phase. This paper is a review of the studies on the structure of metallic glasses. The theory of diffraction by amorphous materials is dealt with at length followed by a description of the procedure of obtaining and analysing the RDF of amorphous alloys. Various models have been put forward to explain the structure of the metallic glasses, and these are fully discussed. A dense random packing model or modifications thereof can best explain the structure and range of stability of amorphous alloys.

17 citations


Cited by
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TL;DR: In this paper, the flow and fracture properties of amorphous metals synthetized by fast quenching from the liquid state were analyzed in conjunction with recently proposed theoretical models.
Abstract: This paper reviews the flow and fracture properties of amorphous metals synthetized by fast quenching from the liquid state. The data are analysed in conjunction with recently proposed theoretical models.

455 citations

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TL;DR: In this paper, the formation and stability of amorphous alloys are discussed in terms of the configurational entropy and in connection with the potential barrier, Δμ, in Bernal's dense random packing model.
Abstract: The formation and stability of amorphous alloys are discussed in terms of the configurational entropy and in connection with the potential barrier, Δμ. The structure analysis of amorphous alloys using Bernal's dense random packing model (D.R.P.) shows quite good agreement with the actual observations. These results indicate that some degree of short range order (∼ 15 A) exists in amorphous metallic alloys, which is slightly different from the arrangement expected in a liquid. The model still shows a continuous structure without the formation of internal boundaries between ordered regions such as is characteristic of polycrystals. Although the D.R.P. does not completely reflect the structure of amorphous alloys, it is still an attractive model in understanding the amorphous state. These subjects are reviewed in this article.

190 citations

Journal ArticleDOI
TL;DR: In this article, the partial structure factors of a binary metallic glass are given based on the experimental data, and various characteristics such as crystallization processes, thermal effects and alloying effects are also discussed.
Abstract: An attempt has been made in this review to cover recent information on the structure of metallic glasses (amorphous metals) obtained by X-ray diffraction. Based on the experimental data, the partial structure factors of a binary metallic glass are given. Various characteristics such as crystallization processes, thermal effects and alloying effects are also discussed.

94 citations

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TL;DR: In this article, the elastic moduli for 137 metallic glasses (MGs) and 56 polycrystalline metals were analyzed through a simple model developed by Knuyt et al. based on a Gaussian distribution for the first-neighbor distance to reveal the short-range-order structural conditions for plasticity of MGs.
Abstract: Through a systematical analysis of the elastic moduli for 137 metallic glasses (MGs) and 56 polycrystalline metals, we use a simple model developed by Knuyt et al. [J. Phys. F: Met. Phys. 16 (1986) p.1989; Phil. Mag. B 64 (1991) p.299] based on a Gaussian distribution for the first-neighbor distance to reveal the short-range-order (SRO) structural conditions for plasticity of MGs. It is found that the SRO structure with dense atomic packing, large packing dispersion and a significant anharmonicity of atomic interaction within an MG is favorable for its global plasticity. Although these conditions seem paradoxical, their perfect matching is believed to be a key for designing large plastic bulk MGs not only in compression but also in tension.

35 citations