MATERIALS TRANSACTIONS
Online ISSN : 1347-5320
Print ISSN : 1345-9678
ISSN-L : 1345-9678
Phase Stability of Nickel-Base Single Crystal Superalloys Containing Iridium Substituting for Ruthenium
Yuhi MoriTadaharu YokokawaToshiharu KobayashiHiroshi HaradaShinsuke Suzuki
Author information
JOURNALS FREE ACCESS FULL-TEXT HTML

2016 Volume 57 Issue 10 Pages 1845-1848

Details
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.

Information related to the author
© 2016 The Japan Institute of Metals and Materials
Previous article Next article
feedback
Top