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 journalpeer-review

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Author(s)

  • J.J. Ruan
  • X.J. Liu
  • S.Y. Yang
  • W.W. Xu
  • T. Omori
  • B. Deng
  • H.X. Jiang
  • C.P. Wang
  • R. Kainuma
  • K. Ishida

Detail(s)

Original languageEnglish
Pages (from-to)126-132
Journal / PublicationIntermetallics
Volume92
Online published17 Oct 2017
Publication statusPublished - Jan 2018
Externally publishedYes

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 journalpeer-review