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).
Publisher Copyright:
© 2016 The Japan Institute of Metals and Materials.
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
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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 -