Kinetics of the allotropic hcp-fcc phase transformation in cobalt
Kinetics of the allotropic hcp-fcc phase transformation in cobalt
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DOI：
10.1080/14786435.2010.525541
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发表时间：
2011-01-01
影响因子：
1.6
通讯作者：
Mittemeijer, Eric Jan
中科院分区：
文献类型：
--
作者：
Bauer, Rico;Jaegle, Eric A.;Mittemeijer, Eric Jan
采用差示扫描量热法（DSC）研究了钴在10 K min-1 ~ 40 K min-1范围内等时退火后的同素异形马氏体相变（hcp fcc）。通过光学显微镜和X射线衍射仪跟踪显微组织的演变。基于一个模块化的相变模型，描述了等时退火时从hcp到fcc Co的相变动力学。适当的模型描述的非热核化和热激活，各向异性界面控制的生长量身定制的马氏体相变的钴实施到模块化模型。拟合的相变动力学模型，同时所有的等时DSC运行产生的值的界面分离的hcp和fcc的Co相和生长的活化能的能量。
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.