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Title: The BCC/B2 morphologies in Al xNiCoFeCr high-entropy alloys

Here, the present work primarily investigates the morphological evolution of the body-centered-cubic (BCC)/B2 phases in Al xNiCoFeCr 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 Al xNiCoFeCr HEAs, are also discussed in light of the concept of the valence electron concentration (VEC).
Authors:
 [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [2] ;  [3] ;  [3]
  1. Dalian Univ. of Technology, Dalian (China)
  2. The Univ. of Tennessee, Knoxville, TN (United States)
  3. Guilin Univ. of Electronic Technology, Guilin (China)
Publication Date:
Grant/Contract Number:
FE0008855
Type:
Accepted Manuscript
Journal Name:
Metals
Additional Journal Information:
Journal Volume: 7; Journal Issue: 2; Journal ID: ISSN 2075-4701
Publisher:
MDPI
Research Org:
Univ. of Tennessee, Knoxville, TN (United States)
Sponsoring Org:
USDOE Office of Fossil Energy (FE)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; high-entropy alloys; Al-Ni-Co-Fe-Cr alloys; microstructure; precipitation morphology; mechanical property
OSTI Identifier:
1356091
Alternate Identifier(s):
OSTI ID: 1362287