Abstract
By taking the solid solution effect of Co, Fe, Mn, and Cr solutes in Ni-rich NiAl as an example, we have determined, through a combination of alloying behavior experiments, first-principles calculations, and neutron diffraction measurements, that magnetism has a profound impact on the mechanical properties of intermetallics. Co solutes do not affect the hardening behavior of NiAl alloys. Fe solutes, on the other hand, induce the most substantial and unusual solid solution softening among these solutes. These results can only be explained by the presence of magnetic interactions induced by solutes located on the Al sublattice. The predicted magnetic moment of Fe solutes was verified by neutron diffraction experiment. Our investigation points out the inadequacy of the conventionally used Goldschmidt radii in addressing the atomic size effect in intermetallics.
| Original language | English |
|---|---|
| Pages (from-to) | 911-919 |
| Number of pages | 9 |
| Journal | Intermetallics |
| Volume | 12 |
| Issue number | 7-9 SPEC. ISS. |
| DOIs | |
| State | Published - Jul 2004 |
Funding
This research was sponsored by the Division of Materials Sciences and Engineering, US Department of Energy, under contract DE-AC05-00OR-22725 with UT-Battelle, LLC. This research was supported in part by an appointment to the Oak Ridge National Laboratory Postdoctoral Research Associates Program administered jointly by the Oak Ridge Institute of Science and Education and Oak Ridge National Laboratory.
| Funders | Funder number |
|---|---|
| US Department of Energy | DE-AC05-00OR-22725 |
| Oak Ridge National Laboratory | |
| Division of Materials Sciences and Engineering |
Keywords
- A. Nickel aluminides, based on NiAl
- B. Solid-solution hardening
- D. Site occupancy
- E. Ab-initio calculations
- F. Diffraction (electron, neutron and X-ray)