Microstructure evolution and elemental diffusion behavior near the interface of Cr2AlC and single crystal superalloy DD5 at elevated temperatures
As one of the promising MAX phase materials for high-temperature applications, Cr2AlC is considered as a potential substitution bond coat material in thermal barrier coating systems. In this paper, the microstructure evolution and elemental diffusion behavior near the interface of the diffusion coup...
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| Language: | English |
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Elsevier Ltd
2020
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| Online Access: | https://eprints.nottingham.ac.uk/60880/ |
| _version_ | 1848799816758329344 |
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| author | Li, Jimeng Jing, Jing He, Jian Chen, Hao Guo, Hongbo |
| author_facet | Li, Jimeng Jing, Jing He, Jian Chen, Hao Guo, Hongbo |
| author_sort | Li, Jimeng |
| building | Nottingham Research Data Repository |
| collection | Online Access |
| description | As one of the promising MAX phase materials for high-temperature applications, Cr2AlC is considered as a potential substitution bond coat material in thermal barrier coating systems. In this paper, the microstructure evolution and elemental diffusion behavior near the interface of the diffusion couple composed of Cr2AlC and single crystal superalloy DD5 were investigated at 1100 °C, 1150 °C, and 1200 °C. Elemental interdiffusion between Cr2AlC and DD5 occurs significantly, resulting in the formation of a thick layer of Kirkendall holes after 20 h heat treatment at 1100 °C and higher temperatures. The outward diffusion of Ni into Cr2AlC and the inward diffusion of Al into DD5 alloy causes the formation of β-NiAl matrix embedded with dispersed Cr7C3 phase. Simultaneously, the precipitation of σ-TCP phase and degradation of the γ/γ′ matrix occurs in the alloy. Additionally, TaC, M2C (where M = Ta, W, Cr), and M23C6 (M = Cr, Re, W) compounds are formed near the interface along with the dissolution of σ-TCP phases. It is further found that Al in Cr2AlC exhibits the highest average effective diffusion coefficient among the four dominant diffusing elements. It also displays the lowest diffusion activation energy which is due to its relatively weak Cr-Al and Al-Al bonds. |
| first_indexed | 2025-11-14T20:41:41Z |
| format | Article |
| id | nottingham-60880 |
| institution | University of Nottingham Malaysia Campus |
| institution_category | Local University |
| language | English |
| last_indexed | 2025-11-14T20:41:41Z |
| publishDate | 2020 |
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| spelling | nottingham-608802020-06-11T00:27:42Z https://eprints.nottingham.ac.uk/60880/ Microstructure evolution and elemental diffusion behavior near the interface of Cr2AlC and single crystal superalloy DD5 at elevated temperatures Li, Jimeng Jing, Jing He, Jian Chen, Hao Guo, Hongbo As one of the promising MAX phase materials for high-temperature applications, Cr2AlC is considered as a potential substitution bond coat material in thermal barrier coating systems. In this paper, the microstructure evolution and elemental diffusion behavior near the interface of the diffusion couple composed of Cr2AlC and single crystal superalloy DD5 were investigated at 1100 °C, 1150 °C, and 1200 °C. Elemental interdiffusion between Cr2AlC and DD5 occurs significantly, resulting in the formation of a thick layer of Kirkendall holes after 20 h heat treatment at 1100 °C and higher temperatures. The outward diffusion of Ni into Cr2AlC and the inward diffusion of Al into DD5 alloy causes the formation of β-NiAl matrix embedded with dispersed Cr7C3 phase. Simultaneously, the precipitation of σ-TCP phase and degradation of the γ/γ′ matrix occurs in the alloy. Additionally, TaC, M2C (where M = Ta, W, Cr), and M23C6 (M = Cr, Re, W) compounds are formed near the interface along with the dissolution of σ-TCP phases. It is further found that Al in Cr2AlC exhibits the highest average effective diffusion coefficient among the four dominant diffusing elements. It also displays the lowest diffusion activation energy which is due to its relatively weak Cr-Al and Al-Al bonds. Elsevier Ltd 2020-08-31 Article PeerReviewed application/pdf en cc_by_nc_nd https://eprints.nottingham.ac.uk/60880/1/Microstructure%20evolution%20and%20elemental%20diffusion%20behavior%20near%20the%20interface%20of%20Cr2AlC%20and%20single%20crystal%20superalloy%20DD5%20at%20elevated%20temperatures.pdf Li, Jimeng, Jing, Jing, He, Jian, Chen, Hao and Guo, Hongbo (2020) Microstructure evolution and elemental diffusion behavior near the interface of Cr2AlC and single crystal superalloy DD5 at elevated temperatures. Materials & Design, 193 . p. 108776. ISSN 02641275 Cr2AlC; Superalloy; Interdiffusion; Microstructure; Diffusion coefficient; Activation energy https://doi.org/10.1016/j.matdes.2020.108776 doi:10.1016/j.matdes.2020.108776 doi:10.1016/j.matdes.2020.108776 |
| spellingShingle | Cr2AlC; Superalloy; Interdiffusion; Microstructure; Diffusion coefficient; Activation energy Li, Jimeng Jing, Jing He, Jian Chen, Hao Guo, Hongbo Microstructure evolution and elemental diffusion behavior near the interface of Cr2AlC and single crystal superalloy DD5 at elevated temperatures |
| title | Microstructure evolution and elemental diffusion behavior near the interface of Cr2AlC and single crystal superalloy DD5 at elevated temperatures |
| title_full | Microstructure evolution and elemental diffusion behavior near the interface of Cr2AlC and single crystal superalloy DD5 at elevated temperatures |
| title_fullStr | Microstructure evolution and elemental diffusion behavior near the interface of Cr2AlC and single crystal superalloy DD5 at elevated temperatures |
| title_full_unstemmed | Microstructure evolution and elemental diffusion behavior near the interface of Cr2AlC and single crystal superalloy DD5 at elevated temperatures |
| title_short | Microstructure evolution and elemental diffusion behavior near the interface of Cr2AlC and single crystal superalloy DD5 at elevated temperatures |
| title_sort | microstructure evolution and elemental diffusion behavior near the interface of cr2alc and single crystal superalloy dd5 at elevated temperatures |
| topic | Cr2AlC; Superalloy; Interdiffusion; Microstructure; Diffusion coefficient; Activation energy |
| url | https://eprints.nottingham.ac.uk/60880/ https://eprints.nottingham.ac.uk/60880/ https://eprints.nottingham.ac.uk/60880/ |