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

Journal Article · · JOM. Journal of the Minerals, Metals & Materials Society
 [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)

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.

Research Organization:
Univ. of Tennessee, Knoxville, TN (United States); University of Illinois Urbana-Champaign, IL (United States)
Sponsoring Organization:
USDOE Office of Fossil Energy (FE)
Grant/Contract Number:
FE0011194
OSTI ID:
1224527
Journal Information:
JOM. Journal of the Minerals, Metals & Materials Society, Vol. 66, Issue 10; ISSN 1047-4838
Publisher:
SpringerCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 63 works
Citation information provided by
Web of Science

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Cited By (8)

High-Entropy Alloys: Potential Candidates for High-Temperature Applications - An Overview journal October 2017
Revealing the Microstates of Body-Centered-Cubic (BCC) Equiatomic High Entropy Alloys journal June 2017
Deviation from high-entropy configurations in the atomic distributions of a multi-principal-element alloy journal January 2015
Atomic and electronic basis for the serrations of refractory high-entropy alloys journal June 2017
Universal Quake Statistics: From Compressed Nanocrystals to Earthquakes journal November 2015
High-entropy alloys: a critical assessment of their founding principles and future prospects journal April 2016
Size effects on plasticity in high-entropy alloys journal August 2018
Mechanical Properties and Microstructure of a NiCrFeCoMn High-Entropy Alloy Deformed at High Strain Rates journal November 2018

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