Alloying effects on oxidation mechanisms in polycrystalline Co-Ni base superalloys
Alloying effects on oxidation mechanisms in polycrystalline Co-Ni base superalloys
复制标题
DOI：
10.1016/j.corsci.2016.12.009
复制
发表时间：
2017-02-15
影响因子：
8.3
通讯作者：
Shollock, B. A.
中科院分区：
文献类型：
--
作者：
Ismail, F. B.;Vorontsov, V. A.;Shollock, B. A.
利用聚焦离子束二次离子质谱（FIB SIMS）对多晶Co-Ni-Cr-Al-W-Ta合金的氧化机理进行了研究。结果发现，Al的添加有利于形成连续的富氧化铝层，铬间接提高抗氧化性和增加的钴分数导致较差的氧化性能。在含15 at.% Cr和10原子% Al，在800 ℃下氧化200小时后形成的外氧化皮包括小于1 μ m厚的氧化物。结果表明，在Co-Ni基高温合金中可以形成保护性氧化膜。(C)2016爱思唯尔有限公司版权所有。
Oxidation mechanisms in polycrystalline Co-Ni-Cr-Al-W-Ta alloys were investigated using O-16/O-18 isotopic tracer analysis in the focused ion-beam secondary ion mass spectrometer (FIB-SIMS). It was found that Al additions favour the formation of a continuous alumina-rich layer, that Cr indirectly improved oxidation resistance and that increasing the Co fraction resulted in poorer oxidation performance. In the alloy containing 15 at.% Cr and 10 at.% Al, the outer scale formed after 200h oxidation at 800 degrees C comprised oxides less than 1 mu m thick. It is concluded that protective oxide scales can be formed in Co-Ni base superalloys. (C) 2016 Elsevier Ltd. All rights reserved.