Novel Co-Ti-V-base superalloys reinforced by L12-ordered γ′ phase
Research output: Journal Publications and Reviews (RGC: 21, 22, 62) › 21_Publication in refereed journal › peer-review
Author(s)
Detail(s)
Original language | English |
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Pages (from-to) | 126-132 |
Journal / Publication | Intermetallics |
Volume | 92 |
Online published | 17 Oct 2017 |
Publication status | Published - Jan 2018 |
Externally published | Yes |
Link(s)
Abstract
The influences of alloying elements Al and Ni to a Co-Ti-V master alloy on microstructures, phase stabilities and high-temperature mechanical properties have been investigated. A two-phase microstructure γ/γʹ with ultrahigh γʹ volume fraction was designed in the Co-Ti-V (master alloy), Co-Ti-V-Al (Al-modified) and Co-Ti-V-Ni (Ni-modified) alloys. Al shows a slight tendency to partition into γʹ, while Ni exhibits almost equal distribution between the γ and γʹ phases. Al is found to increase the volume fraction and solvus temperature of γʹ. The solvus temperatures of γʹ in the master alloy, Al-modified and Ni-modified alloys exceed that of Co-9Al-9W alloy (1000 °C) by 91, 112 and 82 °C, respectively. The flow stresses of the designed alloys exhibit an anomalous positive dependence on temperature rising from 600 to 750 °C. The strengths of the master alloy and Ni-modified alloys are not only higher than that of traditional Co-base superalloy MAR-M 302 at the temperature ranging from 700 to 1000 °C, but also comparable with that of the commercial Ni-base superalloy IN-939 between 850 and 1000 °C. In conclusion, the present Co-Ti-V-base alloys reinforced by γʹ are suggested as potential candidates for high-temperature utilizations.
Research Area(s)
- Cobalt-base superalloys, Compression test, L12 compound, Phase diagram
Citation Format(s)
Novel Co-Ti-V-base superalloys reinforced by L12-ordered γ′ phase. / Ruan, J.J.; Liu, X.J.; Yang, S.Y.; Xu, W.W.; Omori, T.; Yang, T.; Deng, B.; Jiang, H.X.; Wang, C.P.; Kainuma, R.; Ishida, K.
In: Intermetallics, Vol. 92, 01.2018, p. 126-132.Research output: Journal Publications and Reviews (RGC: 21, 22, 62) › 21_Publication in refereed journal › peer-review