Oxidation of intermetallic compound NiAI
Oxidation of intermetallic compound NiAI
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DOI：
10.1179/msc.1981.15.1.7
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发表时间：
1981-01
期刊：
影响因子：
--
通讯作者：
R. Hutchings;M. Loretto;R. Smallman
中科院分区：
文献类型：
--
作者：
R. Hutchings;M. Loretto;R. Smallman
使用扫描和透射电子显微镜（SEM和TEM，分别）和俄歇电子能谱（AES）的NiAl的氧化进行了研究。据观察，在金属间化合物NiAl的几种组合物的氧化过程中，在金属和氧化铝氧化皮之间形成混合氧化物的中间层。界面空隙（这是与剥落的氧化物）和空位位错环中观察到所有的合金检查。在氧化之前通过研磨金属表面可以延迟剥落。从空位注入、Ni和Al在NiAl中的扩散速率不相等和应力三个方面讨论了产生这些缺陷的空位的来源。
The oxidation of NiAI has been studied using scanning and transmission electron microscopy (SEM and TEM, respectively), and Auger electron spectroscopy (AES). It was observed that during the oxidation of several compositions of the intermetallic compound NiAI an intermediate layer of mixed oxide formed between the metal and the alumina scale. Interfacial voids (which are associated with spalling of the oxide) and vacancy dislocation loops were observed in all the alloys examined. Spalling can be delayed by abrading the metal surface prior to oxidation. The origin of the vacancies which give rise to these defects is discussed in terms of (a) vacancy injection, (b) unequal diffusion rates of Ni and Al in NiAI and (c) stress.