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%)|
The physical properties of the above materials, at room temperature and at 1000°C, are shown in the next table:
|Melting point (°C)
|Density (gcm -3)
|Coefficient of thermal expansion (/K)
|Thermal conductivity (W/m.K)
|Specific heat (J/kg.K)
|Electrical resistivity (µ Ω.m)
|Modulus of elasticity (GPa)
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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What is an oxide dispersion strengthened (ODS) alloy?
How are oxide dispersion strengthened (ODS) alloys produced?