High-temperature oxidation behaviors of Co-50Ni-10Al-6Ta-8Cr superalloy

IF 6.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Journal of Alloys and Compounds Pub Date : 2025-10-18 DOI:10.1016/j.jallcom.2025.184492

Yupeng Zhang, Cuiping Wang, Xiang Yu, Chen Yang, Jinbin Zhang, Shuiyuan Yang, Xingjun Liu

{"title":"High-temperature oxidation behaviors of Co-50Ni-10Al-6Ta-8Cr superalloy","authors":"Yupeng Zhang, Cuiping Wang, Xiang Yu, Chen Yang, Jinbin Zhang, Shuiyuan Yang, Xingjun Liu","doi":"10.1016/j.jallcom.2025.184492","DOIUrl":null,"url":null,"abstract":"The oxidation behavior of Al and Cr is crucial to the high-temperature oxidation resistance of superalloys. This work investigates the oxidation behavior of Co-50Ni-10Al-6Ta-8Cr alloy in air at 1000°C as a case study, using multi-scale characterization techniques to explore the types of oxides and competiting mechanisms. Experimental results show that the Co-50Ni-10Al-6Ta-8Cr alloy exhibits good oxidation resistance, with weight gain following a parabolic law. After 25 hours of oxidation, the oxide film consists of three layers—a (Co, Ni)O layer, an α-Al₂O₃ layer and a τ + γ phase layer. After 200 hours of oxidation, the oxide film consists of a (Co, Ni)O layer, a Cr2O3 + CrTaO4 layer, an α-Al2O3 + γ layer and an AlN + τ phase layer. It is found that during the initial oxidation stage, the α-Al2O3 layer serves as the primary oxidation barrier, whereas in the later stage, the Cr2O3 + CrTaO4 layer exhibits superior oxidation resistance. Moreover, the Cr2O3 + CrTaO4 layer effectively reduces the oxygen partial pressure inside the oxide scale but was unable to suppress the inward diffusion of nitrogen, leading to the formation of AlN.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"36 1","pages":""},"PeriodicalIF":6.3000,"publicationDate":"2025-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Alloys and Compounds","FirstCategoryId":"88","ListUrlMain":"https://doi.org/10.1016/j.jallcom.2025.184492","RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"CHEMISTRY, PHYSICAL","Score":null,"Total":0}

引用次数: 0

Abstract

The oxidation behavior of Al and Cr is crucial to the high-temperature oxidation resistance of superalloys. This work investigates the oxidation behavior of Co-50Ni-10Al-6Ta-8Cr alloy in air at 1000°C as a case study, using multi-scale characterization techniques to explore the types of oxides and competiting mechanisms. Experimental results show that the Co-50Ni-10Al-6Ta-8Cr alloy exhibits good oxidation resistance, with weight gain following a parabolic law. After 25 hours of oxidation, the oxide film consists of three layers—a (Co, Ni)O layer, an α-Al₂O₃ layer and a τ + γ phase layer. After 200 hours of oxidation, the oxide film consists of a (Co, Ni)O layer, a Cr₂O₃ + CrTaO₄ layer, an α-Al₂O₃ + γ layer and an AlN + τ phase layer. It is found that during the initial oxidation stage, the α-Al₂O₃ layer serves as the primary oxidation barrier, whereas in the later stage, the Cr₂O₃ + CrTaO₄ layer exhibits superior oxidation resistance. Moreover, the Cr₂O₃ + CrTaO₄ layer effectively reduces the oxygen partial pressure inside the oxide scale but was unable to suppress the inward diffusion of nitrogen, leading to the formation of AlN.

查看原文本刊更多论文

Co-50Ni-10Al-6Ta-8Cr高温合金的高温氧化行为

Al和Cr的氧化行为对高温合金的耐高温氧化性至关重要。本研究以Co-50Ni-10Al-6Ta-8Cr合金在1000℃空气中的氧化行为为例，采用多尺度表征技术探索氧化物的类型和竞争机制。实验结果表明，Co-50Ni-10Al-6Ta-8Cr合金具有良好的抗氧化性能，其重量增加遵循抛物线规律。氧化25小时后，氧化膜由三层组成：（Co, Ni）O层，α-Al₂O₃层和τ + γ相层。氧化200小时后，氧化膜由（Co, Ni）O相层、Cr2O3 + CrTaO4相层、α-Al2O3 + γ相层和AlN + τ相层组成。结果表明，在氧化初期，α-Al2O3层是主要的氧化屏障，而在氧化后期，Cr2O3 + CrTaO4层表现出较强的抗氧化能力。此外，Cr2O3 + CrTaO4层有效降低了氧化层内部的氧分压，但无法抑制氮向内扩散，导致AlN的形成。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

来源期刊

Journal of Alloys and Compounds 工程技术-材料科学：综合

CiteScore

11.10

自引率

14.50%

发文量

5146

审稿时长

67 days

期刊介绍： The Journal of Alloys and Compounds is intended to serve as an international medium for the publication of work on solid materials comprising compounds as well as alloys. Its great strength lies in the diversity of discipline which it encompasses, drawing together results from materials science, solid-state chemistry and physics.