| 锆合金氧化膜在真空退火过程中的氧扩散行为 |
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| 引用本文： | 张君松,廖京京,韦天国,龙冲生.锆合金氧化膜在真空退火过程中的氧扩散行为[J].稀有金属材料与工程,2021,50(5):1590-1595. |
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| 作者姓名： | 张君松 廖京京 韦天国 龙冲生 |
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| 作者单位： | 中国核动力研究设计院 反应堆燃料及材料重点实验室，四川 成都 610213,中国核动力研究设计院 反应堆燃料及材料重点实验室，四川 成都 610213;清华大学 工程物理系，北京 100084,中国核动力研究设计院 反应堆燃料及材料重点实验室，四川 成都 610213,中国核动力研究设计院 反应堆燃料及材料重点实验室，四川 成都 610213 |
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| 摘 要： | 针对已预腐蚀生成一定厚度氧化膜的Zr-Sn-Nb合金，研究了其在不同温度下进行真空热处理过程中的氧扩散动力学及亚稳相演变行为。结果表明，真空退火后氧化膜变薄，氧在氧化锆基体中的扩散增强，并计算了特定合金中氧的扩散系数。退火后微观化学分析表明亚稳相层厚度增加。固溶氧锆基体(Zr(O))层也明显增厚。针对该现象，讨论了对应氧扩散及亚稳相形成过程：该扩散极为可能是由ZrO2和(Zr(O))之间存在的氧含量梯度以及锆基体的高氧溶解度造成，受抑制的氧化速率将促进亚稳相的生长。在实际水腐蚀情况下，氧化及氧化膜向基体溶解过程应该是共存的。当氧化速率受限时，氧化膜向基体溶解作用将增强，有利于形成较厚的亚稳层。
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| 关 键 词： | 锆合金 氧化膜 真空退火 扩散动力学 亚氧化相 |
| 收稿时间： | 2020/5/9 0:00:00 |
| 修稿时间： | 2020/6/12 0:00:00 |
Oxygen Diffusion Behavior of Oxidized Zirconium Alloy During Vacuum Annealing Treatment |
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| Zhang Junsong,Liao Jingjing,Wei Tianguo and Long Chongsheng.Oxygen Diffusion Behavior of Oxidized Zirconium Alloy During Vacuum Annealing Treatment[J].Rare Metal Materials and Engineering,2021,50(5):1590-1595. |
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| Authors: | Zhang Junsong Liao Jingjing Wei Tianguo and Long Chongsheng |
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| Affiliation: | Science and Technology on Reactor Fuel and Materials Laboratory, Nuclear Power Institute of China, Chengdu 610213, China,Science and Technology on Reactor Fuel and Materials Laboratory, Nuclear Power Institute of China, Chengdu 610213, China;Department of Engineering Physics, Tsinghua University, Beijing 100084, China,Science and Technology on Reactor Fuel and Materials Laboratory, Nuclear Power Institute of China, Chengdu 610213, China,Science and Technology on Reactor Fuel and Materials Laboratory, Nuclear Power Institute of China, Chengdu 610213, China |
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| Abstract: | Vacuum heat treatments were performed at different temperatures for the Zr-Sn-Nb alloys which were already oxidized for a certain time. Results show that the oxide film dissolution into the matrix occurs during heat treatment, and the oxygen diffusion from zirconia to nearby zirconium matrix is enhanced. Diffusion kinetics of oxygen is discussed, and the diffusion coefficient is calculated for the specific alloy. The diffusion may be attributed to the existence of oxygen content gradient and the high oxygen solubility in the matrix. ZrO is observed through microscopic chemical analysis, and the thickness of the metastable layer increases after the heat treatment. The thickness of oxygen-dissolved zirconium matrix (Zr(O)) layer also largely widens. It is speculated that in the actual aqueous corrosion procedure, there should be co-existence of oxidation and oxide film dissolution into the matrix. When the oxidation rate is restricted, the oxide film dissolution becomes obvious and facilitates the growth of metastable layer. |
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| Keywords: | zirconium alloy oxide film vacuum annealing diffusion kinetics metastable phases |
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