HRTEM原位加热研究Zr-4合金氧化过程中的晶格演化

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In-situ Heating Investigation on Lattice Evolution of Zircaloy-4 during Its Oxidation Process

1. Nuclear Reactor Operation and Application Research Sub-Institute, Nuclear Power Institute of China, Chengdu, 610213, China;
2. Institute of Materials, Shanghai University, Shanghai, 200072, China

摘要: 采用高分辨透射电镜（HRTEM）原位氧化的方法,研究了Zr-4合金腐蚀初期的行为,为认识Zr-4合金在氧化膜与金属基体界面的氧化行为提供参考。原位氧化实验结果显示ZrO₂的形核过程伴随着连续的晶格演化:ZrO₂形成前,氧原子不断固溶到α-Zr的晶格间隙中,形成若干不连续的富氧区,随着氧含量的增加,富氧区晶格之间产生较大应变促使晶格出现调制以及形成面心立方结构ZrO亚氧化物,亚氧化物由取向接近的畴结构组成,随着反应的继续晶格连续演变直到形成m-ZrO₂。
- Zr-4合金 /
- 高分辨透射电镜(HRTEM) /
- 原位氧化 /
- 相变 /
- 亚氧化物
Abstract: In-situ heating in the HRTEM using zircaloy-4 TEM thin foil specimen was carried out to investigate the oxidation behaviour of zirconium alloy at the initial stage, which provides a new view for the study of corrosion mechanism of zirconium alloys. The result shows that, the oxygen firstly is solid dissolved into the zirconium lattice to form oxygen-rich regions, and with the increasing of oxygen content, the deformation of the lattice increased and compressive strain is produced to promote the lattice modulation and the formation of the fcc structure ZrO sub-oxide. The sub-oxide is consisted of domains with similar crystal orientations and finally transformed to m-ZrO₂.
- Zirconium alloy /
- HRTEM /
- Oxidation /
- In-situ heating /
- Sub-oxide