摘要
研究了Zr-2合金在500—800℃空气中氧化的规律,利用光学显微镜、透射电镜和扫描电镜对氧化膜形貌、组织和晶体结构进行观察,并对氧化膜内表面应力和应力梯度进行了估算。随着氧化膜增厚,氧化膜内表面应力最初增加而后下降,出现极大值;极大应力值和与其相对应的氧化膜厚度都随氧化温度升高而增加,应力梯度随氧化膜增厚呈单调下降。黑色氧化膜内存在三种晶体结构;单斜、四方、立方,最初晶粒细小,模糊不清,随着氧化时间增长,发生回复再结晶后,晶粒衬度才逐渐变得清晰。白色氧化膜为单一的单斜结构。
The oxidation of Zircaloy-2 from 500 to 800℃ in air were investigated. OM, TEM, and SEM techniques were empolyed in investigation of grain structure and lattice structure of oxide film. The stress on the inner face of oxide film and stress gradient have been also measured. The stress on the inner face of oxide film increases at frist and decreases in late, and the stress gradient decreases monotonously with the increase of thickness of oxide film. The maximum stress and the thickness of oxide film, corresponding to the maximuu stress, increase with the increase of temperature. There are three types of lattice structure: cubic, tetragonal and monoclinic exist in black oxide film. The grain size is extremly fine and the grain contrast is indistinct. As the time or temperature of oxidation increase, the grain size becomes coarse and grain contrast becomes more distinct due to recovery and recrystallization taking place. Only a single monoclinic lattice structure was detected in the white oxide film.
出处
《核动力工程》
EI
CAS
CSCD
北大核心
1990年第3期41-47,共7页
Nuclear Power Engineering
基金
中国科学院金属腐蚀与防护研究所开放实验室资助
