Determination of nucleation and growth modes from evaluation of transformed fraction in solid-state transformation

被引：42
|
作者：
Liu, F. [1 ]
Song, S. J. [1 ]
Xu, J. F. [1 ]
Wang, J. [1 ]
机构：
[1] Northwestern Polytech Univ, State Key Lab Solidificat Proc, Xian 710072, Shaanxi, Peoples R China
来源：
ACTA MATERIALIA | 2008年 / 56卷 / 20期
基金：
中国国家自然科学基金;
关键词：
Nucleation; Growth; Transformation; Fraction;
D O I：
10.1016/j.actamat.2008.08.011
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
On the basis of ail analytical transformation model, the transformed fraction has been evaluated for isothermal and isochronal solid-state transformations. From the evolution of Avrami exponent n with annealing temperature T and the evolution of effective activation energy Q with transformed fraction f, the prevailing modes Of nucleation and growth in the isothermal transformation can be determined. As for the isochronal transformation, however, a conversion of the experimentally obtained continuous-heating-transformation (CHT) diagram to the temperature-time-transformation (TTT) diagram should also be performed. Because the modes of nucleation and growth remain unchanged upon CHT-TTT conversion, the prevailing modes of nucleation and growth in the isochronal transformation can be determined. Using numerical calculations, the above evaluation has been tested. Finally, application in the crystallization kinetics of amorphous Pd-Ni-P-Cu and Mg-Cu-Y as measured by differential scanning calorimetry was described. (C) 2008 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码：6003 / 6012
页数：10
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