Mechanical properties of high-entropy alloys with emphasis on face-centered cubic alloys
Abstract
HHigh-entropy alloys (HEAs), also known as multi-principal element alloys or multi-component alloys, have been the subject of numerous investigations since they were first described in 2004. The earliest HEA was the equiatomic CrMnFeCoNi “Cantor” alloy, but HEAs now encompass a broad class of metallic and ceramic systems. The concept of utilizing the high entropy of mixing to develop stable multi-element alloys may not be scientifically correct but has produced extraordinary mechanical properties in specific HEAs, mainly CrCoNi-based alloys, associated with their continuous work-hardening rate that is sustained to large plastic strains (~0.5) and at low temperatures. This, in combination with the high frictional forces on dislocations and a propensity for twinning, leads to outstandingly high fracture toughness values (exceeding 200 MPa·m1/2) and resistance to shear-band formation under dynamic loading. The critical shear strain for the onset of adiabatic shear band formation is ~7 for the Cantor alloy, much higher than that for conventional alloys, suggesting superior ballistic properties. The slower diffusion rates resulting from the multi-element environment contribute to the excellent intermediate-temperature performance. We review the principal mechanical properties of these alloys with emphasis on the face-centered cubic systems, such as the CrCoNi-based alloys. Their favorable mechanical properties and easemore »
- Authors:
-
- Univ. of California, San Diego, CA (United States)
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Univ. of California, Berkeley, CA (United States)
- Publication Date:
- Research Org.:
- Univ. of California, San Diego, CA (United States)
- Sponsoring Org.:
- USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division
- OSTI Identifier:
- 1634203
- Alternate Identifier(s):
- OSTI ID: 1636758
- Grant/Contract Number:
- NA0003842; NA0002080; AC02-05CH11231
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Progress in Materials Science
- Additional Journal Information:
- Journal Volume: 102; Journal Issue: C; Journal ID: ISSN 0079-6425
- Publisher:
- Elsevier
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; mechanical properties; high-entropy alloys; fracture; fatigue; dynamic behavior
Citation Formats
Li, Zezhou, Zhao, Shiteng, Ritchie, Robert O., and Meyers, Marc A. Mechanical properties of high-entropy alloys with emphasis on face-centered cubic alloys. United States: N. p., 2018.
Web. doi:10.1016/j.pmatsci.2018.12.003.
Li, Zezhou, Zhao, Shiteng, Ritchie, Robert O., & Meyers, Marc A. Mechanical properties of high-entropy alloys with emphasis on face-centered cubic alloys. United States. https://doi.org/10.1016/j.pmatsci.2018.12.003
Li, Zezhou, Zhao, Shiteng, Ritchie, Robert O., and Meyers, Marc A. Tue .
"Mechanical properties of high-entropy alloys with emphasis on face-centered cubic alloys". United States. https://doi.org/10.1016/j.pmatsci.2018.12.003. https://www.osti.gov/servlets/purl/1634203.
@article{osti_1634203,
title = {Mechanical properties of high-entropy alloys with emphasis on face-centered cubic alloys},
author = {Li, Zezhou and Zhao, Shiteng and Ritchie, Robert O. and Meyers, Marc A.},
abstractNote = {HHigh-entropy alloys (HEAs), also known as multi-principal element alloys or multi-component alloys, have been the subject of numerous investigations since they were first described in 2004. The earliest HEA was the equiatomic CrMnFeCoNi “Cantor” alloy, but HEAs now encompass a broad class of metallic and ceramic systems. The concept of utilizing the high entropy of mixing to develop stable multi-element alloys may not be scientifically correct but has produced extraordinary mechanical properties in specific HEAs, mainly CrCoNi-based alloys, associated with their continuous work-hardening rate that is sustained to large plastic strains (~0.5) and at low temperatures. This, in combination with the high frictional forces on dislocations and a propensity for twinning, leads to outstandingly high fracture toughness values (exceeding 200 MPa·m1/2) and resistance to shear-band formation under dynamic loading. The critical shear strain for the onset of adiabatic shear band formation is ~7 for the Cantor alloy, much higher than that for conventional alloys, suggesting superior ballistic properties. The slower diffusion rates resulting from the multi-element environment contribute to the excellent intermediate-temperature performance. We review the principal mechanical properties of these alloys with emphasis on the face-centered cubic systems, such as the CrCoNi-based alloys. Their favorable mechanical properties and ease of processing by conventional means suggest extensive utilization in many future structural applications.},
doi = {10.1016/j.pmatsci.2018.12.003},
journal = {Progress in Materials Science},
number = C,
volume = 102,
place = {United States},
year = {Tue Dec 18 00:00:00 EST 2018},
month = {Tue Dec 18 00:00:00 EST 2018}
}
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