Ultra-strong and strain-hardenable ultrafine-grained medium-entropy alloy via enhanced grain-boundary strengthening

Jeong Min Park; Dae Cheol Yang; Han-Jin Kim; Dong Geun Kim; Sunghak Lee; Hyoung Seop Kim; Seok Su Sohn

doi:10.1080/21663831.2021.1913768

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Ultra-strong and strain-hardenable ultrafine-grained medium-entropy alloy via enhanced grain-boundary strengthening

Original Report | 更新时间：2026-08-19

- Ultra-strong and strain-hardenable ultrafine-grained medium-entropy alloy via enhanced grain-boundary strengthening
- Materials Research Letters Vol. 9, Issue 7, Pages: 315-321(2021)
- 作者机构：
  
  1. b Center for High Entropy Alloys Pohang University of Science and Technology
  2. c Department of Materials Science and Engineering Korea University
  3. a Department of Materials Science and Engineering Pohang University of Science and Technology Pohang Republic of Korea
  4. b Center for High Entropy Alloys Pohang University of Science and Technology Pohang Republic of Korea
  5. d Graduate Institute of Ferrous Technology Pohang University of Science and Technology
- 作者简介：
- 基金信息：
- DOI：10.1080/21663831.2021.1913768
  CLC：
- Online First：20 April 2021，
  
  Published：2021
- 稿件说明：
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Jeong Min Park, Dae Cheol Yang, Han-Jin Kim, et al. Ultra-strong and strain-hardenable ultrafine-grained medium-entropy alloy via enhanced grain-boundary strengthening[J]. Materials Research Letters, 2021, 9(7): 315-321.
DOI：

Jeong Min Park, Dae Cheol Yang, Han-Jin Kim, et al. Ultra-strong and strain-hardenable ultrafine-grained medium-entropy alloy via enhanced grain-boundary strengthening[J]. Materials Research Letters, 2021, 9(7): 315-321. DOI： 10.1080/21663831.2021.1913768.

摘要

Abstract

n equiatomic VCoNi medium-entropy alloy possesses high sensitivity to grain-boundary strengthening

achieved by severe lattice distortions. Its ultrafine-grain structure enables 1.5 Gigapascal yield strength even for the fully recrystallized alloy with a single face-centered cubic structure. The high density of grain boundaries also generates high back stresses via piling up of massive dislocations

and the low cross-slip probabilities produce not only robust dislocation-mediated plasticity but also high back stress contribution to flow stress

which affords high strain-hardening capability to ultrafine-grain alloys

with 1.7 Gigapascal ultimate tensile strength with remarkable ductility. Our approach provides a new method for developing ultrastrong metallic materials.

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Related Institution

b Singapore Institute of Manufacturing Technology (SIMTech) Agency for Science Technology and Research (A*STAR)

a Advanced Remanufacturing Technology Centre (ARTC) Agency for Science Technology and Research (A*STAR)

State Key Laboratory for Mechanical Behavior of Materials Xi'an Jiaotong University

d State Key Laboratory of Powder Metallurgy Central South University

c School of Materials Science and Engineering Harbin Institute of Technology

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