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Common properties of oxide dispersion strengthened alloys

The compositions and physical properties of two commercially-available oxide dispersion strengthened (ODS) alloys (one iron-based, the other nickel-based) are given in the tables below.

 Composition (wt%)
NameNiFeCrAlTiCYttrium Oxide
INCONEL MA754 78 1.0 20 0.3 0.5 0.05 0.6
INCOLOY MA956 - 74 20 4.5 0.5 0.05 0.5

The physical properties of the above materials, at room temperature and at 1000°C, are shown in the next table:

Melting point (°C) 1400 1482
Density (gcm -3) 8.3 7.2
  Room Temp 1000°C Room Temp 1000°C
Coefficient of thermal expansion (/K) 12.2x10 -6 17.0x10 -6 11.3x10 -6 14.9x10 -6
Thermal conductivity (W/m.K) 14.3 32.6 10.9 25.5
Specific heat (J/kg.K) 440 695 469 741
Electrical resistivity (µ Ω.m) 1.08 1.16 1.31 1.43
Modulus of elasticity (GPa) 203 133 269 191

ODS alloys are specifically designed, through a combination of composition and microstructure, to operate at high temperature under mechanical stress for extended periods. This requires a combination of excellent chemical resistance, particularly to high temperature oxidation, with retention of mechanical properties at high temperature, a function of creep resistance and elastic modulus achieved through elongated grain structure and grain boundary pinning.

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Further information

What is an oxide dispersion strengthened (ODS) alloy?
How are oxide dispersion strengthened (ODS) alloys produced?

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