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

School of Fundamental Science and Engineering

Research output: Contribution to journal › Article › peer-review

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

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

Access to Document

10.2320/matertrans.MAW201606

Fingerprint Dive into the research topics of 'Phase stability of nickel-base single crystal superalloys containing iridium substituting for ruthenium'. Together they form a unique fingerprint.

Cite this

@article{89f8ba286da1441c85cd0c545419d3d2,

title = "Phase stability of nickel-base single crystal superalloys containing iridium substituting for ruthenium",

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.",

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

author = "Yuhi Mori and Tadaharu Yokokawa and Toshiharu Kobayashi and Hiroshi Harada and Shinsuke Suzuki",

note = "Funding Information: Japan Society for the Promotion of Science (JSPS).",

year = "2016",

doi = "10.2320/matertrans.MAW201606",

language = "English",

volume = "57",

pages = "1845--1848",

journal = "Materials Transactions",

issn = "1345-9678",

publisher = "Japan Institute of Metals (JIM)",

number = "10",

}

TY - JOUR

T1 - Phase stability of nickel-base single crystal superalloys containing iridium substituting for ruthenium

AU - Mori, Yuhi

AU - Yokokawa, Tadaharu

AU - Kobayashi, Toshiharu

AU - Harada, Hiroshi

AU - Suzuki, Shinsuke

N1 - Funding Information: Japan Society for the Promotion of Science (JSPS).

PY - 2016

Y1 - 2016

N2 - 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.

AB - 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.

KW - Iridium

KW - Nickel-Base Single Crystal Superalloy

KW - Phase Stability

KW - Ruthenium

KW - Time Temperature Transformation Diagram

KW - Topologically Close Packed Phase

UR - http://www.scopus.com/inward/record.url?scp=84989862627&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84989862627&partnerID=8YFLogxK

U2 - 10.2320/matertrans.MAW201606

DO - 10.2320/matertrans.MAW201606

M3 - Article

AN - SCOPUS:84989862627

VL - 57

SP - 1845

EP - 1848

JO - Materials Transactions

JF - Materials Transactions

SN - 1345-9678

IS - 10

ER -