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Title: Temperature effects on deformation and serration behavior of high-entropy alloys (HEAs)

Many materials are known to deform under shear in an intermittent way with slip avalanches detected as acoustic emission and serrations in the stress–strain curves. Similar serrations have recently been observed in a new class of materials, called high-entropy alloys (HEAs). Here, we discuss the serration behaviors of several HEAs from cryogenic to elevated temperatures. The experimental results of slow compression and tension tests are compared with the predictions of a slip-avalanche model for the deformation of a broad range of solids. The results shed light on the deformation processes in HEAs. Temperature effects on the distributions of stress drops and the decrease of the cutoff (i.e., of the largest observed slip size) for increasing temperature qualitatively agree with the model predictions. As a result, the model is used to quantify the serration characteristics of HEAs, and pertinent implications are discussed.
Authors:
 [1] ;  [2] ;  [2] ;  [3] ;  [4] ;  [5] ;  [6] ;  [6] ;  [3] ;  [7] ;  [8] ;  [2] ;  [2] ;  [1]
  1. University of Illinois Urbana-Champaign, IL (United States). Dept. of Physics.
  2. Univ. of Tennessee, Knoxville, TN (United States). Dept. of Materials Science and Engineering.
  3. National Tsing Hua Univ., Hsinchu (Taiwan). Dept. of Materials Science and Engineering.
  4. Taiyuan Univ. of Technology (China). College of Materials Science and Engineering.
  5. Univ. of Science and Technology, Beijing (China). State Key Lab. for Advanced Metals and Materials.
  6. National Academy of Sciences of Ukraine (NASU), Kharkov (Ukraine). B. Verkin Inst. for Low Temperature Physics and Engineering.
  7. Air Force Research Lab. (AFRL), Materials and Manufacturing Directorate, OH (United States)
  8. National Energy Technology Lab. (NETL), Albany, OR (United States); USR Corp., Albany, OR (United States)
Publication Date:
OSTI Identifier:
1224527
Grant/Contract Number:
FE0011194
Type:
Accepted Manuscript
Journal Name:
Journal of The Minerals, Metals & Materials Society
Additional Journal Information:
Journal Volume: 66; Journal Issue: 10; Journal ID: ISSN 1047-4838
Publisher:
Springer
Research Org:
The University of Tennessee, Knoxville, TN (United States); University of Illinois Urbana-Champaign, IL (United States)
Sponsoring Org:
USDOE Office of Fossil Energy (FE)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE