Zr-Nb-Cu合金第二相分析

Second Phases in the Zr-Nb-Cu Alloy

摘要:

通过扫描电镜和透射电镜观察Zr-Nb-Cu合金最终退火板材的显微组织及第二相，并利用选区电子衍射确定第二相晶体结构。结果表明，在Zr-Nb-Cu合金退火板材中存在两种第二相，第1种为体心立方（bcc）的β-Nb，尺寸较小，在晶粒内部弥散分布；第2种尺寸较大，在晶界分布，这种第二相为含Fe和Nb的四方结构Zr2Cu相。

Abstract:

The microstructure and the second phases in the annealed Zr-Nb-Cu alloy were characterized by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The crystal structure of the second phases was determined by selected area electron diffraction (SAD) pattern, and the quantitative analysis of second phases was preformed using TEM with energy dispersion spectroscopy (EDS). Results show that there are two kinds of second phases in the Zr-Nb-Cu alloy. The first one is β-Nb with a bcc structure, small size and a dispersive distribution in the grains, and the second one is Zr2Cu precipitates with a tetragonal structure, big size and a distribution on the grain boundary.