The kinetics of a polytypic Laves phase transformation in TiCr2

被引：26
|
作者：
Baumann, Wolfgang [1 ]
Leineweber, Andreas [1 ]
Mittemeijer, Eric Jan [1 ,2 ]
机构：
[1] Max Planck Inst Met Res, D-70569 Stuttgart, Germany
[2] Univ Stuttgart, Inst Mat Sci, D-70569 Stuttgart, Germany
来源：
INTERMETALLICS | 2011年 / 19卷 / 04期
关键词：
Laves phases; Phase transformation; Defects: dislocation geometry and arrangement; Calorimetry; DIFFERENTIAL THERMAL-ANALYSIS; ANALYSIS MEASUREMENT SIGNAL; CALIBRATION; STABILITY; CR;
D O I：
10.1016/j.intermet.2010.11.027
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
A systematic investigation of the kinetics of the polytypic C36 reversible arrow C14 equilibrium phase (shear) transformation occurring at about 1545 K was performed. A recently developed calibration and desmearing procedure for a differential thermal analysis (DTA) apparatus [Baumann et al. Thermochim. Acta 2008; 472:50] enabled the investigation of the progress of this transformation by isochronal DTA measurements, both upon heating and cooling. A kinetic model was developed on basis of the modular approach, which considers overlapping nucleation, growth and impingement. It was shown that a thermal nucleation prevailed, i.e. pre-existing nuclei (here: arrays of dislocations) become activated as function of undercooling/overheating. The model fitting led to values for the equilibrium transformation temperature, the C36/C14 interface energy and the activation energy for growth. Moreover, a quantitative explanation was given of the composition-dependent thermal hysteresis of the transformation. (C) 2010 Elsevier Ltd. All rights reserved.
引用
收藏
页码：526 / 535
页数：10
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