The BCC/B2 Morphologies in AlxNiCoFeCr High-Entropy Alloys

The present work primarily investigates the morphological evolution of the body-centered-cubic (BCC)/B2 phases in AlxNiCoFeCr high-entropy alloys (HEAs) with increasing Al content. It is found that the BCC/B2 coherent morphology is closely related to the lattice misfit between these two phases, whic...

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Bibliographic Details
Published in:Metals (Basel ) 2017-02, Vol.7 (2), p.57-57
Main Authors: Ma, Yue, Jiang, Beibei, Li, Chunling, Wang, Qing, Dong, Chuang, Liaw, Peter K, Xu, Fen, Sun, Lixian
Format: Article
Language:English
Subjects:
Al-Ni-Co-Fe-Cr alloys
Aluminum
Body centered cubic lattice
Coherence
Compressive properties
Evolution
high-entropy alloys
MATERIALS SCIENCE
Mathematical morphology
Mechanical properties
mechanical property
microstructure
Phases
precipitation morphology
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Summary:The present work primarily investigates the morphological evolution of the body-centered-cubic (BCC)/B2 phases in AlxNiCoFeCr high-entropy alloys (HEAs) with increasing Al content. It is found that the BCC/B2 coherent morphology is closely related to the lattice misfit between these two phases, which is sensitive to Al. There are two types of microscopic BCC/B2 morphologies in this HEA series: one is the weave-like morphology induced by the spinodal decomposition, and the other is the microstructure of a spherical disordered BCC precipitation on the ordered B2 matrix that appears in HEAs with a much higher Al content. The mechanical properties, including the compressive yielding strength and microhardness of the AlxNiCoFeCr HEAs, are also discussed in light of the concept of the valence electron concentration (VEC).
ISSN:2075-4701
2075-4701
DOI:10.3390/met7020057