A study on the surface and crack tip oxidation of alloy 600 through high-resolution characterization
A study on the surface and crack tip oxidation of alloy 600 through high-resolution characterization
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DOI：
10.1016/j.corsci.2020.108616
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发表时间：
2020-06
影响因子：
8.3
通讯作者：
Kai Chen;Zhao Shen
中科院分区：
文献类型：
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作者：
Kai Chen;Zhao Shen
研究了600合金的表面氧化、停滞晶界氧化和裂纹尖端氧化。镜面表面氧化物具有双层结构，并讨论了各层的形成机制。冷加工表面上观察到更致密的氧化膜，而纳米GB优先氧化。裂纹尖端的氧化速率比停滞的GB快大约四个数量级，并且它们的氧化机制被认为是相同的。扩散诱导晶界迁移（DIGM）观察周围的裂纹和氧化GB提示。镍驱逐的DIGM的作用进行了讨论。
Surface, stagnant grain boundary (GB), and crack tip oxidation of Alloy 600 were studied. The mirror-finished surface oxide has a duplex structure and the formation mechanisms of each layer are discussed. A more compact oxide film is observed on the cold-worked surface, while the nano-GBs are preferentially oxidized. The crack tip oxidation rate is around four orders of magnitude faster than that of the stagnant GB, and their oxidation mechanisms are believed to be the same. Diffusion-induced grain boundary migration (DIGM) is observed around the crack and oxidized GB tips. The role of Ni expulsion on the DIGM is discussed.