摘要
研究了Zr-2/Cr扩散偶在1023～1123K范围内的反应扩散.用扫描电镜观测反应层宽度,用能谱仪(EDS)测定了反应层Zr、Fe和Cr沿扩散方向的浓度分布,研究了反应层的生长动力学.结果表明,反应层生长基本符合抛物线规律,生长过程受扩散控制.用Boltzman-Matano-Heumann模型计算了Cr在反应层Zr(Fe、Cr)2中的互扩散系数D,得到了互扩散系数D与温度的Arrhenius方程.由计算的扩散数据与Cr在Zr中形成稀固溶体时Cr的扩散数据比较可知,Cr在金属间化合物Zr(Fe、Cr)2中的扩散比在稀固溶体中的扩散快5个数量级.
The reaction diffusion of the chromium-zircaloy-2 diffusion couples were investigated in the temperature range of 1023-1123 K. Scanning electron microscope and energy dispersive spectrum (EDS) were used to measure the thickness of the reaction layer and to determine the Zr, Fe and Cr concentration profile of reaction layer along the penetrating direction, respectively. The growth kinetics of reaction layer has been studied. The results show that the growth of intermetallic compound is controlled by the process of volume diffusion as the layer growth approximately obeys the parabolic law. Interdiffusion coefficients were calculated using Boltzman-Matano-Heumann mode and Arrhenius equation for Cr diffusion in Zr (Fe, Cr)2 layer was consequently obtained. Calculated interdiffusion coefficients were compared with those obtained on the condition that Cr dissolves in Zr and merely forms dilute solid solution. The comparison indicates that Cr diffuse in dilute solid solution is five orders of magnitude faster than in Zr (Fe, Cr)2 intermetallic compound.
出处
《核动力工程》
EI
CAS
CSCD
北大核心
2002年第3期34-39,共6页
Nuclear Power Engineering
关键词
ZR-2
CR
反应扩散
扩散系数
Chromium
Reaction kinetics
Scanning electron microscopy
Solid solutions
Zirconium alloys
