Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7988397 | Intermetallics | 2018 | 7 Pages |
Abstract
The high entropy alloys (HEAs) is a kind of innovative alloy design conception. However, seldom quantitative thermodynamics descriptions were reported in the past. In this paper, as a demonstration, the microstructures and thermodynamic properties of CoCrCuFeNi HEA were studied by combining experimental approaches with computational simulations. The CoCrCuFeNi alloy shows duplex FCC structure with Cu-lean and Cu-rich phase. With the increase of heat treatment temperature from 773 K to 1273 K, the predicted total configurational entropy changes from 6.13 to 7.83 J·molâ1·Kâ1, which is far less than the common-believed Boltzmann's hypothesis value (13.38 J·molâ1·Kâ1) due to the ordering behavior of element occupying on the sublattices. Cu atoms tend to enrich in liquid phase, which segregates as interdendritic microstructure during solidification process. The experimental results are highly consistent with the calculated results.
Related Topics
Physical Sciences and Engineering
Materials Science
Metals and Alloys
Authors
Bo Wu, Zheyu Xie, Jinchang Huang, Jinwei Lin, Yixu Yang, Linqiao Jiang, Jianglin Huang, Guoxin Ye, Chunfeng Zhao, Shangjin Yang, Baisheng Sa,