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?