Growth behavior study of second phase particles in a Zr-Sn-Nb-Fe-Cr-Cu alloy
- 作者：B.F. Luan ; bfluan@cqu.edu.cn ; L.J. Chai ; J.W. Chen ; M. Zhang ; Q. Liu
- 刊名：Journal of Nuclear Materials
- 出版年：2012
- 期刊代码：51_00223115
- 类别：ms
- 出版时间：April, 2012
- 卷：423
- 期：1-3
- 页码：127-131
- 文件大小：758 K
摘要
The growth behavior of the second phase particles (SPPs) in a Zr-Sn-Nb-Fe-Cr-Cu alloy during aging (600-700 掳C, 30-1800 min) has been investigated using scanning electron microscopy (SEM) and an image analysis technique. Microstructural observations show that the precipitated SPPs distribute linearly along the boundaries of 伪 plates at the initial aging stage. As the aging time prolongs and/or temperature increases, the linear distribution feature of SPPs weakens gradually and finally a random distribution is formed. A numerical analysis confirms that the growth of SPPs follows well the second order kinetics of Kahlweit theory and the activation energy is experimentally determined to be 194 kJ/mol. The reason for the larger growth activation energy of the SPPs in the experimental alloy, compared to that in Zircaloy-4, is discussed and ascribed to the addition of Nb element.