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Title: Effects of temperature on serrated flows of Al 0.5CoCrCuFeNi high-entropy alloy

Compression behavior of the Al 0.5CoCrCuFeNi high-entropy alloy (HEA) was studied at different temperatures from 673 K to 873 K at a low strain rate of 5 x 10 –5/s to investigate the temperature effect on the mechanical properties and serration behavior. The face-centered-cubic (fcc) structure is confirmed at the lower temperature of 673 K and 773 K, and a structure of mixed fcc and body-centered cubic (bcc) is identified at a higher temperature of 873 K after compression tests using high-energy synchrotron x-ray diffraction. As a result, by comparing the stress–strain curves at different temperatures, two opposite directions of serrations types were found, named upward serrations appearing at 673 K and 773 K and downward serrations at 873 K, which may be due to dynamic strain aging.
 [1] ;  [1] ;  [1] ;  [2] ;  [3] ;  [4] ;  [5] ;  [1]
  1. Univ. of Tennessee, Knoxville, TN (United States)
  2. Taiyuan Univ. of Technology, Taiyuan (China)
  3. Univ. of Science and Technology Beijing, Beijing (China)
  4. Argonne National Lab. (ANL), Argonne, IL (United States)
  5. Univ. of Illinois Urbana-Champaign, Champaign, IL (United States)
Publication Date:
Grant/Contract Number:
FE0011194; AC02-06CH11357
Accepted Manuscript
Journal Name:
Journal of The Minerals, Metals & Materials Society
Additional Journal Information:
Journal Volume: 67; Journal Issue: 10; Journal ID: ISSN 1047-4838
Research Org:
Univ. of Tennessee, Knoxville, TN (United States); Univ. of Illinois Urbana-Champaign, Champaign, IL (United States); Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org:
USDOE Office of Fossil Energy (FE); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
36 MATERIALS SCIENCE; high-entropy alloy; mechanical properties; serration behavior
OSTI Identifier:
Alternate Identifier(s):
OSTI ID: 1245424