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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| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
University of Belgrade, Technical Faculty, Bor
2017-01-01
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| Series: | Journal of Mining and Metallurgy. Section B: Metallurgy |
| Subjects: | |
| Online Access: | http://www.doiserbia.nb.rs/img/doi/1450-5339/2017/1450-53391700021C.pdf |
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| Summary: | 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. |
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| ISSN: | 1450-5339 2217-7175 |