Microstructure, hardness and interfacial energy in Co-9Al-10W-xNi (x=15, 25, 35 at. %) alloys during aging
In the present paper, three Co-Al-W-Ni alloys (i.e., Co-9Al-10W-xNi with x=15, 25, 35 at. %) and their heat treatment mechanisms were carefully designed on the basis of the available phase equilibrium information. The temporal evolution of the microstructure and hardness in the Co-9Al-10W-x...
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| Format: | Article |
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University of Belgrade, Technical Faculty, Bor
2017-01-01
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| Series: | Journal of Mining and Metallurgy. Section B: Metallurgy |
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| Online Access: | http://www.doiserbia.nb.rs/img/doi/1450-5339/2017/1450-53391700021C.pdf |
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| author | Che C. Yang S. Wei M. Zhang L. Li Q. Gao J. Du Y. |
| author_facet | Che C. Yang S. Wei M. Zhang L. Li Q. Gao J. Du Y. |
| author_sort | Che C. |
| collection | DOAJ |
| description | In the present paper, three Co-Al-W-Ni alloys (i.e., Co-9Al-10W-xNi with
x=15, 25, 35 at. %) and their heat treatment mechanisms were carefully
designed on the basis of the available phase equilibrium information. The
temporal evolution of the microstructure and hardness in the Co-9Al-10W-xNi
(x=15, 25, 35) alloys during aging process was measured, from which the
effect of additional Ni contents, aging temperature and time on
microstructure and hardness in the three Co-Al- W-Ni alloys was analyzed.
Considering that the alloy compositions and heat treatment are not directly
related with the hardness, the relationship between hardness and
microstructure was then linked. It was found that the hardness of Co-based
superalloys increases as the volume fraction of γ' precipitates increases,
while decreases with the increase of the radius and interval of γ'
precipitates. Moreover, the interfacial energy of γ/γ' interface was also
evaluated on the basis of the coarsening kinetics of γ' precipitates and the
Philippe-Voorhees model in combination with the thermodynamic and atomic
mobility databases. The results indicate that the interfacial energies of
γ/γ' interface reduce as the increase of additional Ni content and aging
temperature. |
| format | Article |
| id | doaj-art-f970bf28d8a54155bdebb91d0d5375d4 |
| institution | Kabale University |
| issn | 1450-5339 2217-7175 |
| language | English |
| publishDate | 2017-01-01 |
| publisher | University of Belgrade, Technical Faculty, Bor |
| record_format | Article |
| series | Journal of Mining and Metallurgy. Section B: Metallurgy |
| spelling | doaj-art-f970bf28d8a54155bdebb91d0d5375d42025-02-02T00:16:35ZengUniversity of Belgrade, Technical Faculty, BorJournal of Mining and Metallurgy. Section B: Metallurgy1450-53392217-71752017-01-0153330330810.2298/JMMB170531021C1450-53391700021CMicrostructure, hardness and interfacial energy in Co-9Al-10W-xNi (x=15, 25, 35 at. %) alloys during agingChe C.0Yang S.1Wei M.2Zhang L.3Li Q.4Gao J.5Du Y.6Central South University, State Key Laboratory of Powder Metallurgy, Changsha, Hunan, P.R. ChinaCentral South University, State Key Laboratory of Powder Metallurgy, Changsha, Hunan, P.R. ChinaCentral South University, State Key Laboratory of Powder Metallurgy, Changsha, Hunan, P.R. ChinaCentral South University, State Key Laboratory of Powder Metallurgy, Changsha, Hunan, P.R. ChinaCentral South University, State Key Laboratory of Powder Metallurgy, Changsha, Hunan, P.R. ChinaCentral South University, State Key Laboratory of Powder Metallurgy, Changsha, Hunan, P.R. ChinaCentral South University, State Key Laboratory of Powder Metallurgy, Changsha, Hunan, P.R. ChinaIn the present paper, three Co-Al-W-Ni alloys (i.e., Co-9Al-10W-xNi with x=15, 25, 35 at. %) and their heat treatment mechanisms were carefully designed on the basis of the available phase equilibrium information. The temporal evolution of the microstructure and hardness in the Co-9Al-10W-xNi (x=15, 25, 35) alloys during aging process was measured, from which the effect of additional Ni contents, aging temperature and time on microstructure and hardness in the three Co-Al- W-Ni alloys was analyzed. Considering that the alloy compositions and heat treatment are not directly related with the hardness, the relationship between hardness and microstructure was then linked. It was found that the hardness of Co-based superalloys increases as the volume fraction of γ' precipitates increases, while decreases with the increase of the radius and interval of γ' precipitates. Moreover, the interfacial energy of γ/γ' interface was also evaluated on the basis of the coarsening kinetics of γ' precipitates and the Philippe-Voorhees model in combination with the thermodynamic and atomic mobility databases. The results indicate that the interfacial energies of γ/γ' interface reduce as the increase of additional Ni content and aging temperature.http://www.doiserbia.nb.rs/img/doi/1450-5339/2017/1450-53391700021C.pdfCo-Al-W-Ni superalloysmicrostructurehardnesscoarseninginterfacial energy |
| spellingShingle | Che C. Yang S. Wei M. Zhang L. Li Q. Gao J. Du Y. Microstructure, hardness and interfacial energy in Co-9Al-10W-xNi (x=15, 25, 35 at. %) alloys during aging Journal of Mining and Metallurgy. Section B: Metallurgy Co-Al-W-Ni superalloys microstructure hardness coarsening interfacial energy |
| title | Microstructure, hardness and interfacial energy in Co-9Al-10W-xNi (x=15, 25, 35 at. %) alloys during aging |
| title_full | Microstructure, hardness and interfacial energy in Co-9Al-10W-xNi (x=15, 25, 35 at. %) alloys during aging |
| title_fullStr | Microstructure, hardness and interfacial energy in Co-9Al-10W-xNi (x=15, 25, 35 at. %) alloys during aging |
| title_full_unstemmed | Microstructure, hardness and interfacial energy in Co-9Al-10W-xNi (x=15, 25, 35 at. %) alloys during aging |
| title_short | Microstructure, hardness and interfacial energy in Co-9Al-10W-xNi (x=15, 25, 35 at. %) alloys during aging |
| title_sort | microstructure hardness and interfacial energy in co 9al 10w xni x 15 25 35 at alloys during aging |
| topic | Co-Al-W-Ni superalloys microstructure hardness coarsening interfacial energy |
| url | http://www.doiserbia.nb.rs/img/doi/1450-5339/2017/1450-53391700021C.pdf |
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