Phase separation of metastable CoCrFeNi high entropy alloy at intermediate temperatures

By F. He, Zhijun Wang, Qingfeng Wu, Junjie Li, Jincheng Wang, C. Liu. 2016

264 citations recorded by the source corpus.

The CoCrFeNi alloy is widely accepted as an exemplary stable base for high entropy alloys (HEAs). Although various investigations prove it to be stable solid solution, its phase stability is still suspicious. Here, we identified that the CoCrFeNi HEA was thermally metastable at intermediate temperatures, and composition decomposition occurred after annealed at 750oC for 800 hrs. The increased lattice distortion induced by minor addition of Al into the CoCrFeNi base accelerated the composition decomposition and a second fcc phase with a different lattice constant occurred in the long time annealed CoCrFeNiAl0.1 HEA. A Cr-rich {\sigma} phase also precipitated from the CoCrFeNiAl0.1 HEA. The Al element can induce the instability of CoCrFeNi HEA. The revealed metastable CoCrFeNi at intermediate temperatures will greatly change the way of HEAs development.

Subfields: Aerospace Engineering, Mechanical Engineering

View Paper: https://www.semanticscholar.org/paper/f5922b3c9b18420aede9b84af8c1ff6f44eba654

How researchers see this paper

The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.

In Aerospace Engineering

1. M. Kawasaki
2. Terence G. Langdon
3. Zhaoping Lu
4. Junyang He
5. H. Shahmir
6. P. K. Liaw
7. C. Liu
8. Z. Horita

In Mechanical Engineering

1. M. Kawasaki
2. Zhaoping Lu
3. Junyang He
4. Terence G. Langdon
5. H. Shahmir
6. Tayebeh Mousavi
7. Z. Horita
8. R. Valiev

Citations in the corpus

• Microstructure and properties of a CoCrFeNiMn high-entropy alloy processed by equal-channel angular pressing (2017, background): “It is important to note that the σphase was not detected after annealing in the homogenized condition [5,34].”