Development of Ir-base refractory superalloys

Journal Article · Mon Jul 15 04:00:00 EDT 1996 · Scripta Materialia

DOI:https://doi.org/10.1016/1359-6462(96)00109-1· OSTI ID:276174

Yamabe, Y; Koizumi, Y; Murakami, H; Ro, Y; Maruko, T; Harada, H ^[1]

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1. National Research Inst. for Metals, Tsukuba, Ibaraki (Japan)

In the present study the authors propose a new class of superalloys: refractory superalloys. This new concept is defined as alloys with {gamma}-fcc and {gamma}{prime}-L1{sub 2} phases coherent structures similar to Ni-base superalloys, and yet with considerably higher melting points. Ir, having a melting point of 2,443 C, is selected as the base metal for the refractory superalloys since Ir has {gamma}-fcc structure and can be equilibrated with {gamma}{prime}-L1{sub 2} structure according to binary phase diagrams, e.g., in Ir-Nb, Ir-Ti, Ir-Ta, Ir-Hf, Ir-Zr and Ir-V systems. Hence the authors designed Ir-base refractory superalloys and tested their mechanical properties and oxidation resistance at up to 1,800 C. The Ir-Nb and Ir-Ti alloys are reported in this paper.

• OSTI ID: 276174
• Journal Information: Scripta Materialia, Journal Name: Scripta Materialia Journal Issue: 2 Vol. 35; ISSN 1359-6462; ISSN XZ503X
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
36 MATERIALS SCIENCE
BINARY ALLOY SYSTEMS
CHEMICAL COMPOSITION
COMPRESSION STRENGTH
GAS TURBINE ENGINES
IRIDIUM
IRIDIUM ALLOYS
LATTICE PARAMETERS
MATERIALS
MICROSTRUCTURE
NIOBIUM ALLOYS
OXIDATION
PHASE DIAGRAMS
SCANNING ELECTRON MICROSCOPY
TITANIUM ALLOYS
TRANSMISSION ELECTRON MICROSCOPY
WEIGHT MEASUREMENT
X-RAY DIFFRACTION