Phase stability of nickel-base single crystal superalloys containing iridium substituting for ruthenium

Yuhi Mori; Tadaharu Yokokawa; Toshiharu Kobayashi; Hiroshi Harada; Shinsuke Suzuki

doi:10.2320/matertrans.MAW201606

Phase stability of nickel-base single crystal superalloys containing iridium substituting for ruthenium

Yuhi Mori, Tadaharu Yokokawa, Toshiharu Kobayashi, Hiroshi Harada, Shinsuke Suzuki

Research output: Contribution to journal › Article

2 Citations (Scopus)

Abstract

Phase stability of Ni-base single crystal superalloys was compared between Ir addition and Ru addition. Investigated alloys were TMS-238 and its derivative alloys. The thermodynamic equilibrium microstructures obtained by a strain aging showed that the volume fractions of γ, γ and topologically close packed (TCP) phases in the alloys were virtually the same to each other without depending on Ir substitution for Ru. On the other hand, the time temperature transformation diagrams obtained by an ordinary aging showed a significant delay in TCP precipitation in the alloys with Ir substitution. The delay in the TCP precipitation might be attributed to the smaller interdiffusion coefficient of Ir-Ni, compared with one of Ru-Ni. The smaller interdiffusion coefficient may affect the kinetics of the TCP precipitation.

Original language	English
Pages (from-to)	1845-1848
Number of pages	4
Journal	Materials Transactions
Volume	57
Issue number	10
DOIs	https://doi.org/10.2320/matertrans.MAW201606
Publication status	Published - 2016

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Keywords

Iridium
Nickel-Base Single Crystal Superalloy
Phase Stability
Ruthenium
Time Temperature Transformation Diagram
Topologically Close Packed Phase

ASJC Scopus subject areas

Materials Science(all)
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering

Cite this

Mori, Y., Yokokawa, T., Kobayashi, T., Harada, H., & Suzuki, S. (2016). Phase stability of nickel-base single crystal superalloys containing iridium substituting for ruthenium. Materials Transactions, 57(10), 1845-1848. https://doi.org/10.2320/matertrans.MAW201606

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AU - Suzuki, Shinsuke

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10.2320/matertrans.MAW201606