Abstract
The Cu and NiAl nanoscale precipitation and interfacial segregation in the martensite and austenite phases within a high-strength steel were studied by atom-probe tomography (APT). In the martensite phase, APT reveals the precipitation of isolated NiAl nanoparticles and NiAl/Cu co-precipitates, indicating that NiAl nanoparticles form first in the precipitation sequence. In comparison, the austenite phase contains only Cu nanoparticles with Ni segregation at the particle/matrix interface, in which the Ni segregation reduces the Cu nanoparticle interfacial energy. In addition, Mn and C exhibit an enrichment at the martensite/austenite interface, and the mechanism for the interfacial segregation was also discussed.
| Original language | English |
|---|---|
| Pages (from-to) | 562-568 |
| Number of pages | 7 |
| Journal | Materials Research Letters |
| Volume | 5 |
| Issue number | 8 |
| DOIs | |
| State | Published - Nov 15 2017 |
Funding
This research was supported by a grant from City University of Hong Kong (Project No.7004686), the General Research Fund (account No. CityU11205515) and the Collaborative Research Fund (account No. C1027-14E) supported by the Research Grant Council, Hong Kong. Atom-probe tomography was conducted at ORNL’s Center for Nanophase Materials Sciences (CNMS), which is a U.S. DOE Office of Science User Facility. This research was supported by a grant from City University of Hong Kong (Project No.7004686), the General Research Fund (account No. CityU11205515) and the Collaborative Research Fund (account No. C1027-14E) supported by the Research Grant Council, Hong Kong.
Keywords
- Cu and NiAl precipitate
- atom-probe tomography
- high-strength steel
- interfacial segregation
- nanoscale precipitation