{"title":"Ni-Al-Y高温合金的组织性能和循环氧化行为","authors":"Mehmet Sahin Atas, M. Yildirim","doi":"10.31577/km.2022.4.281","DOIUrl":null,"url":null,"abstract":"The microstructure, microhardness, and oxidation resistance of ternary model Ni-13Al--2Y (at.%) and Ni-11Al-4Y (at.%) superalloys were studied in detail. The microstructures of alloys consisted of primary γ -Ni dendrites and residual eutectic. The Ni 17 Y 2 intermetallic and γ -Ni were the major constituents of the eutectic phase mixture. The microhardness value of Ni-11Al-4Y alloy was higher than that of Ni-13Al-2Y alloy because of the higher amount of relatively harder eutectic. With increasing Y concentration from 2 to 4 at.%, the mass gain, oxide scale thickness, and oxidation rate remarkably increased. For both alloys, the oxide scale was comprised of three layers: NiO as a surface layer, Al 2 O 3 as an inner layer in the metal/oxide interface, and mixed Al/Y oxides as an internal layer. Although the studied alloys exhibited fairly good scale adherence in conjunction with almost no important scale spallation, they exhibited faster oxidation kinetics along with higher mass gains.","PeriodicalId":49937,"journal":{"name":"Kovove Materialy-Metallic Materials","volume":null,"pages":null},"PeriodicalIF":0.7000,"publicationDate":"2022-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"1","resultStr":"{\"title\":\"Structural properties and cyclic oxidation behavior of Ni-Al-Y superalloys\",\"authors\":\"Mehmet Sahin Atas, M. Yildirim\",\"doi\":\"10.31577/km.2022.4.281\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"The microstructure, microhardness, and oxidation resistance of ternary model Ni-13Al--2Y (at.%) and Ni-11Al-4Y (at.%) superalloys were studied in detail. The microstructures of alloys consisted of primary γ -Ni dendrites and residual eutectic. The Ni 17 Y 2 intermetallic and γ -Ni were the major constituents of the eutectic phase mixture. The microhardness value of Ni-11Al-4Y alloy was higher than that of Ni-13Al-2Y alloy because of the higher amount of relatively harder eutectic. With increasing Y concentration from 2 to 4 at.%, the mass gain, oxide scale thickness, and oxidation rate remarkably increased. For both alloys, the oxide scale was comprised of three layers: NiO as a surface layer, Al 2 O 3 as an inner layer in the metal/oxide interface, and mixed Al/Y oxides as an internal layer. Although the studied alloys exhibited fairly good scale adherence in conjunction with almost no important scale spallation, they exhibited faster oxidation kinetics along with higher mass gains.\",\"PeriodicalId\":49937,\"journal\":{\"name\":\"Kovove Materialy-Metallic Materials\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":0.7000,\"publicationDate\":\"2022-10-17\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"1\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Kovove Materialy-Metallic Materials\",\"FirstCategoryId\":\"88\",\"ListUrlMain\":\"https://doi.org/10.31577/km.2022.4.281\",\"RegionNum\":4,\"RegionCategory\":\"材料科学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q4\",\"JCRName\":\"MATERIALS SCIENCE, MULTIDISCIPLINARY\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Kovove Materialy-Metallic Materials","FirstCategoryId":"88","ListUrlMain":"https://doi.org/10.31577/km.2022.4.281","RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"MATERIALS SCIENCE, MULTIDISCIPLINARY","Score":null,"Total":0}
Structural properties and cyclic oxidation behavior of Ni-Al-Y superalloys
The microstructure, microhardness, and oxidation resistance of ternary model Ni-13Al--2Y (at.%) and Ni-11Al-4Y (at.%) superalloys were studied in detail. The microstructures of alloys consisted of primary γ -Ni dendrites and residual eutectic. The Ni 17 Y 2 intermetallic and γ -Ni were the major constituents of the eutectic phase mixture. The microhardness value of Ni-11Al-4Y alloy was higher than that of Ni-13Al-2Y alloy because of the higher amount of relatively harder eutectic. With increasing Y concentration from 2 to 4 at.%, the mass gain, oxide scale thickness, and oxidation rate remarkably increased. For both alloys, the oxide scale was comprised of three layers: NiO as a surface layer, Al 2 O 3 as an inner layer in the metal/oxide interface, and mixed Al/Y oxides as an internal layer. Although the studied alloys exhibited fairly good scale adherence in conjunction with almost no important scale spallation, they exhibited faster oxidation kinetics along with higher mass gains.
期刊介绍:
Kovove Materialy - Metallic Materials is dedicated to publishing original theoretical and experimental papers concerned with structural, nanostructured, and functional metallic and selected non-metallic materials. Emphasis is placed on those aspects of the science of materials that address:
the relationship between the microstructure of materials and their properties, including mechanical, electrical, magnetic and chemical properties;
the relationship between the microstructure of materials and the thermodynamics, kinetics and mechanisms of processes;
the synthesis and processing of materials, with emphasis on microstructural mechanisms and control;
advances in the characterization of the microstructure and properties of materials with experiments and models which help in understanding the properties of materials.