TWI Frequently asked questions
by Paul Jackson
The composition 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 |
Further information
What is an oxide dispersion strengthened (ODS) alloy?
How are oxide dispersion strengthened (ODS) alloys produced?
