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Title: High-velocity deformation of Al0.3CoCrFeNi high-entropy alloy: Remarkable resistance to shear failure

Journal Article · · Scientific Reports
DOI: https://doi.org/10.1038/srep42742 · OSTI ID:1366535
 [1];  [1];  [2];  [2];  [1]
  1. Univ. of California, San Diego, CA (United States). Materials Science and Engineering Program
  2. Univ. of Tennessee, Knoxville, TN (United States). Dept. of Materials Science and Engineering

Here, the mechanical behavior of a single phase (fcc) Al0.3CoCrFeNi high-entropy alloy (HEA) was studied in the low and high strain-rate regimes. The combination of multiple strengthening mechanisms such as solid solution hardening, forest dislocation hardening, as well as mechanical twinning leads to a high work hardening rate, which is significantly larger than that for Al and is retained in the dynamic regime. The resistance to shear localization was studied by dynamically-loading hat-shaped specimens to induce forced shear localization. However, no adiabatic shear band could be observed. It is therefore proposed that the excellent strain hardening ability gives rise to remarkable resistance to shear localization, which makes this material an excellent candidate for penetration protection applications such as armors.

Research Organization:
Univ. of California, San Diego, CA (United States)
Sponsoring Organization:
USDOE Office of Fossil Energy (FE); USDOE National Nuclear Security Administration (NNSA); US Army Research Office (ARO); National Science Foundation (NSF)
Contributing Organization:
National Energy Technology Laboratory
Grant/Contract Number:
NA0002080; FE0008855; FE0024054; FE0011194
OSTI ID:
1366535
Journal Information:
Scientific Reports, Vol. 7; ISSN 2045-2322
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 228 works
Citation information provided by
Web of Science

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Cited By (8)

Microstructure and Mechanical Properties of Al–Co–Cr–Fe–Ni Base High Entropy Alloys Obtained Using Powder Metallurgy journal January 2019
High Strain Rate Response of Al0.7CoCrFeNi High Entropy Alloy: Dynamic Strength Over 2 GPa from Thermomechanical Processing and Hierarchical Microstructure journal December 2018
Influence of ordered L12 precipitation on strain-rate dependent mechanical behavior in a eutectic high entropy alloy journal April 2019
From symmetry to entropy: Crystal entropy difference strongly affects early stage phase transformation journal December 2019
Plastic deformation transition in FeCrCoNiAl x high-entropy alloys journal July 2019
Mechanical Properties and Microstructure of a NiCrFeCoMn High-Entropy Alloy Deformed at High Strain Rates journal November 2018
A Review on Heterogeneous Nanostructures: A Strategy for Superior Mechanical Properties in Metals journal May 2019
Application of Nano High-Entropy Alloys to Reduce Energy Consumption and Wear of Copper Oxide and High-Grade Iron Ores in Heavy Mining Industries—A Case Study journal December 2019