Abstract
The concept of high entropy alloy (HEA) opens a vast unexplored composition range for alloy design. As a well-studied system, Al-Co-Cr-Fe-Ni has attracted tremendous amount of attention to develop new-generation low-density structural materials for automobile and aerospace applications. In spite of intensive investigations in the past few years, the phase stability within this HEA system is still poorly understood and needs to be clarified, which poses obstacles to the discovery of promising Al-Co-Cr-Fe-Ni HEAs. In the present work, the CALPHAD approach is employed to understand the phase stability and explore the phase transformation within the Al-Co-Cr-Fe-Ni system. The phase-stability mapping coupled with density contours is then constructed within the composition - temperature space, which provides useful guidelines for the design of low-density Al-Co-Cr-Fe-Ni HEAs with desirable properties.
| Original language | English |
|---|---|
| Pages (from-to) | 425-433 |
| Number of pages | 9 |
| Journal | Materials and Design |
| Volume | 109 |
| DOIs | |
| State | Published - Nov 5 2016 |
Funding
The authors very much appreciate the financial support from the U.S. Army Office Project ( W911NF-13-1-0438 ), and U.S. Department of Energy (DOE) Office of Fossil Energy, National Energy Technology Laboratory (NETL) ( DE-FE-0008855 and DE-FE-0024054 ). M.C.G. acknowledges the support by the Cross-Cutting Technologies Program at NETL under the RES contract DE-FE-0004000 . APT was conducted at ORNL's Center for Nanophase Materials Sciences (CNMS), which is a U.S. DOE Office of Science User Facility. U.S. DOE Office of Science User Facility.
| Funders | Funder number |
|---|---|
| U.S. Department of Energy | |
| Office of Fossil Energy | |
| U.S. Army | W911NF-13-1-0438 |
| National Energy Technology Laboratory | DE-FE-0024054, DE-FE-0004000, DE-FE-0008855 |
Keywords
- Atom probe tomography (APT)
- CALPHAD
- High-entropy alloy
- Phase diagram
- Phase stability