Kinetics of the allotropic hcp-fcc phase transformation in cobalt

被引：75
作者：
Bauer, Rico [2 ]
Jaegle, Eric A. [1 ]
Baumann, Wolfgang [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：
PHILOSOPHICAL MAGAZINE | 2011年 / 91卷 / 03期
关键词：
cobalt; allotropy; calorimetry; transformation kinetics; modelling; AUSTENITE-FERRITE TRANSFORMATION; MARTENSITIC-TRANSFORMATION; AMORPHOUS AL85NI8Y5CO2; THIN-FILMS; NUCLEATION; CRYSTALLIZATION; ALLOYS; GROWTH; MODEL; AL;
D O I：
10.1080/14786435.2010.525541
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The allotropic, martensitic phase transformation (hcp fcc) in cobalt was investigated by differential scanning calorimetry (DSC) upon isochronal annealing at heating rates in the range from 10 K min-1 to 40 K min-1. The microstructural evolution was traced by optical microscopy and X-ray diffractometry. The kinetics of the phase transformation from hcp to fcc Co upon isochronal annealing was described on the basis of a modular phase transformation model. Appropriate model descriptions for athermal nucleation and thermally activated, anisotropic interface controlled growth tailored to the martensitic phase transformation of Co were implemented into the modular model. Fitting of this model of phase transformation kinetics to simultaneously all isochronal DSC runs yielded values for the energy of the interface separating the hcp and fcc Co phase and the activation energy for growth.
引用
收藏
页码：437 / 457
页数：21
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