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A new approach for determining the critical cooling rates of nucleation in glass‐forming liquids
Author(s) -
Liu Shujiang,
Tao Haizheng,
Zhang Yafei,
Yue Yuanzheng
Publication year - 2017
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.14926
Subject(s) - nucleation , liquidus , crystallization , thermodynamics , materials science , work (physics) , continuous cooling transformation , crystal growth , atmospheric temperature range , classical nucleation theory , process (computing) , microstructure , metallurgy , computer science , physics , austenite , bainite , alloy , operating system
Abstract Crystallization of a liquid below liquidus temperature is a complex process due to simultaneous nucleation and growth of crystals. Nucleation is the crucial initial step of the crystallization process, and affects the glass‐forming ability, especially when there is a large overlap between nucleation and crystal growth versus temperature curves. From the temperature‐time‐transformation (TTT) diagram, one can estimate the critical cooling rate, q c∗ , of glass‐formation, however this is time‐consuming. In this paper, we establish a simple approach to determine the q c∗using calorimetric and viscometric data. Based on the classical nucleation theory, the correlation between the crystallization onset temperature and cooling rate is described by combining two temperature‐dependent functions. The new approach is applicable to a wide range of glass‐forming systems. This work also gives insight into heterogeneous nucleation and glass formation kinetics.