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FAQ: What are the common properties of oxide dispersion strengthened (ODS) alloys?

   

What are the common properties of oxide dispersion strengthened (ODS) alloys?

Frequently Asked Questions

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%)
Name Ni Fe Cr Al Ti C Yttrium 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:

Property MA754 MA956
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?