Abstract
An examination of a compositionally graded AlxCuCrFeNi2 high entropy alloy (HEA) or complex concentrated alloy (CCA), revealed that marginally increasing Al content from x = 0.8 to x = 1.0 (+ 6 at.%) changes the primary solidification phase from a simple disordered-fcc to a bcc-based ordered-B2 phase. Subsequently, a second solidification product forms, a disordered-bcc in case of x = 0.8 and a disordered-fcc in case of x = 1.0. Solid-state decomposition within these phases results in fcc + L12 and bcc + B2 products, accompanied by compositional partitioning. These results provide new insights into the influence of Al on the primary solidification product, and have been rationalized using a computational thermodynamic approach.
| Original language | English |
|---|---|
| Pages (from-to) | 186-190 |
| Number of pages | 5 |
| Journal | Scripta Materialia |
| Volume | 127 |
| DOIs | |
| State | Published - Jan 15 2017 |
Funding
This research has been conducted in part under a sub-contract from United Technology Corporation (UTC) and in collaboration with the U.S. Air Force Research Laboratory (AFRL). The authors would also like to acknowledge use of facilities at the Center for Advanced Research and Technology (CART) at the University of North Texas. One of the co-authors (RVR) would also like to acknowledge the NTU-HUJ-BGU Nanomaterials for Energy and Water Management Programme under the Campus for Research Excellence and Technological Enterprise (CREATE), that is supported by the National Research Foundation-Prime Minister's office, Republic of Singapore . SG would like to acknowledge DGA (Direction Générale de l'Armement) for support through the ERE programme ( ERE 2015 60 0013 ). SG would like to thank Thermo-Calc Software AB for providing the TCHEA1 database.
Keywords
- Complex concentrated alloys
- High entropy alloys
- Lens
- Microscopy
- Thermodynamic modeling