Abstract
The microstructures of a hierarchical-precipitate-strengthened ferritic alloy are characterized, using transmission-electron microscopy (TEM) and atom-probe tomography (APT). The alloy shows duplex precipitates. The primary precipitate with an average edge length of 90 nm consists of NiAl- and Ni2TiAl-type phases, while the secondary precipitate with an average radius of 2 nm is a NiAl-type phase. Based on the APT results, the volume fractions of the primary and secondary precipitates were calculated, using the lever rule to be 17.3 and 2.3%, respectively.
| Original language | English |
|---|---|
| Pages (from-to) | 584-588 |
| Number of pages | 5 |
| Journal | Journal of Alloys and Compounds |
| Volume | 706 |
| DOIs | |
| State | Published - 2017 |
Funding
The present research is supported by the Department of Energy (DOE), Office of Fossil Energy Program, under Grants of DE-09NT0008089, DE-FE0005868, DE-FE-0011194, and DE-FE-0024054 with Mr. Richard Dunst, Mr. Vito Cedro, Dr. Patricia Rawls, Mr. Steven Markovich, and Dr. Jessica Mullen as the program managers. The research was supported as part of a user proposal through ORNL's Center for Nanophase Materials Sciences (CNMS), which is a DOE Office of Science User Facility.
| Funders | Funder number |
|---|---|
| Office of Fossil Energy Program | DE-09NT0008089, DE-FE-0024054, DE-FE-0011194, DE-FE0005868 |
| U.S. Department of Energy | |
| Office of Science | |
| Oak Ridge National Laboratory |
Keywords
- Atom probe tomography
- Ferritic steels
- Heusler phases
- Precipitation
- Transmission electron microscopy (TEM)