High-temperature materials based on quaternary Ir-Nb-Ni-Al alloys

X. Yu, Y. Yamabe-Mitarai, Y. Ro, S. Nakaza, H. Harada

Research output: Contribution to journalConference articlepeer-review


A novel method to develop new quaternary alloys with an fcc/L12 coherent structure is proposed. This paper reviews the development of quaternary Ir-Nb-Ni-Al alloys. The microstructure, lattice misfit, and compressive 0.2% flow stress of 15 kinds of alloys were investigated systematically. Two kinds of coherent structures, fcc/L12-Ir3Nb and fcc/L12-Ni3Al, were observed in most alloys. Two two-phase structures, fcc+L12-Ir3Nb and fcc+L12-Ni3Al, were observed in Ir-rich and Ni-rich regions, respectively. The lattice misfits of quaternary Ir-Nb-Ni-Al alloys were higher than those of Ni- or Ir-base binary alloys. The compressive 0.2% flow stresses of quaternary alloys increased dramatically compared with those of Ni-base superalloys. The quaternary alloys located in the Ir-rich region were not only had higher strength but also better ductility than Ir-base binary alloys. The potential use of quaternary alloys is discussed.

Original languageEnglish
JournalMaterials Research Society Symposium - Proceedings
Publication statusPublished - 2001 Dec 1
Externally publishedYes
EventHigh Temperature Ordered Intermetallic Alloys IX - Boston, MA, United States
Duration: 2000 Nov 272000 Nov 29

ASJC Scopus subject areas

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


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