Constant-velocity and constant-load compression tests have been conducted to examine the mechanical behavior of polycrystalline Ir1-xNixAl intermetallic compounds with x = 0 to 1·0 at elevated temperatures. Ductility of Ir1-xNixAl is improved with increasing x, while the strength decreases with increasing x in the intermediate temperature range. The specific strength of Ir1-xNixAl is almost independent of x at temperatures higher than approximately 1473 K. Secondary creep of IrAl and Ir0·2Ni0·8Al (i.e. modified NiAl) exhibits class II and class I behavior, respectively. Creep strength of Ir1-xNixAl is about a magnitude of four higher than that of single-phase and multi-phase NiAl at a given applied stress. The Ir1-xNixAl intermetallic compound is superior to binary IrAl as a high-temperature structural material from the viewpoint of the specific strength, ductility and resistance to oxidation, especially at temperatures higher than 1473 K. Published by Elsevier Science Limited. All rights reserved.
- A. intermetallics
- B. creep
- G. energy system
- Mechanical properties at high temperature
- Nickel aluminides based on NiAl