Influence of Composition and Phase Distribution on the Oxidation Behaviour of NiCoCrAIY Alloys
Influence of Composition and Phase Distribution on the Oxidation Behaviour of NiCoCrAIY Alloys
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成分和相分布对NiCoCrAlY合金氧化行为的影响
DOI：
10.4028/www.scientific.net/msf.369-372.165
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发表时间：
2001
期刊：
影响因子：
--
通讯作者：
L. Singheiser
中科院分区：
文献类型：
--
作者：
R. Muñoz;D. Clemens;F. Tietz;R. Anton;J. Quadakkers;L. Singheiser
Ni（Co）CrAlY合金和涂层的相组成和分布对氧化物的过渡阶段和内部氧化物形貌有很大影响。本文阐述了Co、Cr和Al添加剂对合金相组成和形貌的影响。Co和Cr使γ '相不稳定并促进σ相的形成。膨胀法被证明是测定Ni（Co）CrAlY合金在温度变化时的相变的有用技术。相分布决定了在氧化的早期阶段形成的氧化物的形态和NiY相分布。富NiY相的分布决定了内氧化的最终形貌。Ni（Co）CrAlY晶界上NiY相的粗分布导致指型内氧化，这被发现对氧化皮粘附有不利影响。
Phase composition and distribution can strongly affect the transient oxide stages as well as the internal oxide morphology of Ni(Co)CrAlY alloys and coatings. In the present paper the influence of Co-, Cr- and Al-additions on phase composition and morphology is illustrated. Co, as well as Cr, destabilises the γ'-phase and promotes the formation of the σ-phase, Dilatometry is shown as an useful technique to determine phase transformations in Ni(Co)CrAlY alloys upon temperature changes. The phase distribution determines the morphology of the oxide formed during early stages of oxidation and the NiY-phase distribution. The distribution of the NiY-rich phase determines the final morphology of the internal oxidation. A coarse distribution of the NiY-phase on Ni(Co)CrAlY grain boundaries leads to a finger type internal oxidation which was found to have a detrimental effect on oxide scale adherence.