☆ 4.7 Article

Gradient structure design to strengthen carbon interstitial Fe40Mn40Co10Cr10 high entropy alloys

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING (2020)

期刊

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING

卷 772, 期 -, 页码 -

出版社

ELSEVIER SCIENCE SA

DOI: 10.1016/j.msea.2019.138661

关键词

High entropy alloys; Gradient structure; Mechanical property; Synergetic strengthening mechanism; Back stress strain hardening

类别

Nanoscience & Nanotechnology Materials Science, Multidisciplinary Metallurgy & Metallurgical Engineering

资金

National Natural Science Foundation of China [51871178, 51621063]
State Key Laboratory for Mechanical Behavior of Materials [20171910]

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摘要

In this work, gradient structure is successfully produced in the surface of FCC structured (Fe40Mn40Co10Cr10)C-3.3 high entropy alloy (HEA) by using surface mechanical rolling treatment (SMRT). The depth of surface gradient layer with higher hardness increases with increasing the SMRT passes. The Introducing of gradient layer not only significantly improves the strength of HEAs but also remains sufficient ductility. The ultra-high strength of the gradient structured HEA is mainly related to the synergetic strengthening mechanism, while the comparatively good ductility is ascribed to the back stress strain hardening mechanism. Gradient structure design provides a novel strategy for producing HEM with high performance.

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