Transient nucleation effects in glass formation |
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| Affiliation: | 1. Department of Mechanical Engineering and Materials Science, Washington University, St. Louis, MO 63130, USA;2. Science and Technology Division, Corning Incorporated, Corning, New York 14831, USA;3. Department of Physics and the Institute of Materials Science & Engineering, Washington University, St. Louis, MO 63130, USA;1. Department of Mechanical Engineering, G H Raisoni College of Engineering, Nagpur 440012, India;2. Department of Metallurgy and Materials Engineering, Defence Institute of Advanced Technology, Girinagar, Pune 411025, India;3. Advanced Magnetics Group, Defence Metallurgical Research Laboratory, Kanchanbagh, Hyderabad 500058, India;4. Computational Materials Engineering Group, Department of Metallurgical and Materials Engineering, National Institute of Technology, Rourkela 769008, India;1. CERTEV — Center for Research, Technology and Education in Vitreous Materials, Department of Materials Engineering, Federal University of São Carlos, 13565 - 905 São Carlos, SP, Brazil;2. Universidade de São Paulo, Escola de Engenharia de São Carlos, Brazil |
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| Abstract: | We extend to the non-isothermal case a numerical technique that was developed to treat transient homogeneous nucleation in a one-component system by modeling directly the reaction by which clusters are produced. Calculations are presented for the nucleation frequency during the quench and for the number of nuclei produced and the volume fraction transformed at the end of quench for different rates of cooling from the melt. Three model systems are considered: an alkali silicate which is a relatively good glass former, and two metallic glasses. These show a wide range of critical cooling rates for glass formation. In some systems transient effects are predicted to be critical for glass formation. A simple technique is presented for determining when transient effects are important based on a calculation using steady state nucleation frequencies and macroscopic growth velocities. |
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